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1	Aquatic Biodiversity (International)	ABS-5
Potential of Aquatic Plant Nymphoides sp from Lake Towuti Indonesia as new Ethnobotany Media Fitri Isma Nugraha(a*), Hessy Novita(b) , Muh Alias L. Rajamuddin(c), Hari Eko Irianto(d), Berna Elya (e) a) Indonesian Research Institute for Ornamental Fish Culture, Ministry of Marine and Fisheries, Republic of Indonesia, Depok, West Java, Indonesia b) Installation Pathology and Fish Disease, Ministry of Marine and Fisheries, Republic of Indonesia, Depok, West Java, Indonesia c) Pangkep State Polytechnic of Agriculture South Sulawesi, Makassar, South Sulawesi, Indonesia d) Research and Development Center for Marine and Fisheries Product Processing and Biotechnology, Jakarta, Indonesia e) Faculty of Pharmacy, University of Indonesia, Depok, West Java, Indonesia Abstract Abstract: Nymphoides, sp is an aquatic and wetland plant that is now widely used to decorate aquariums and garden ponds of aquatic flora hobbyists. In this study, the active compounds of Nymphoides, sp from Lake Towuti, South Sulawesi, Indonesia was explored using the GC-MS method. The compound detection process using GC-MS method involved the laboratory of health, DKI Jakarta Province, Indonesia. The results revealed the presence of 22 important bio molecules. Two of which had high concentrations of 9,12-Octadecadienoic acid (Z, Z) - (19.07%) and hexadecanoic acid (18.20%). All of the active compounds have medicinal properties, i.e. anti-oxidant, anti-inflammatory, anti-bacterial, 5&#945--reductase inhibitory, antialopecic and lubricant, anti-arthritic, therapeutic properties including hypocholesterolemic, nematicide, anticoronary, hepatoprotective, anti-androgenic, antihistaminic, insectifuge, antieczemic, and antiacne. The percentage of the 20 other compounds was from 1.08% to 5.68%. Nymphoides sp from Lake Towuti, South Sulawesi had the potential as a new candidate for its medicinal properties from aquatic flora. Keywords: Nymphoides sp, GC-MS, aquatic plant, natural compounds Share Link | Plain Format | Corresponding Author (Media Fitri Isma nugraha)

2	Aquatic Biodiversity (International)	ABS-9
Intertidal barnacles (Cirripedia, Thoracica) from Seribu Islands, Indonesia Pipit Pitriana, Abdul Basit Badan Riset dan Inovasi Nasional, Indonesia Abstract Barnacles (Cirripedia) are cosmopolite and abundant crustaceans, with over 1000 species found worldwide in polar, tropical, and temperate waters, from the ocean shore to its depths. In spite of that, research on the taxonomy of barnacles in Indonesia remains sparse. This study was conducted to provide additional contributions to the study of taxonomy and biodiversity of barnacles in Indonesia, especially on the coast of Seribu Islands. In this study, barnacles were collected at Pari Island, Tikus Island, and Burung Island on the Seribu Islands, Indonesia. The species identification of barnacle specimens was based on morphological characters, such as parietes, opercular plates, trophi, and cirri. The result showed that species of barnacle found in this study were Acasta echinata, Amphibalanus amphitrite, and Capitulum mittela. Keywords: barnacles, taxonomy, biodiversity, Indonesia Share Link | Plain Format | Corresponding Author (Pipit Pitriana)

3	Aquatic Biodiversity (International)	ABS-267
Occurrence of ectoparasites on Nile Tilapia (Oreochromis niloticus) from South Sulawesi Lakes, and Aquaculture facility Hilal Anshary*, Karmila Azra, Ika, Nila Sukarni, Hendrawani, Rosmaniar and Sriwulan Universitas Hasanuddin Abstract Nile tilapia, whether cultivated or living in the wild, is susceptible to various parasite infection. Parasitology investigation was conducted to identify parasites of Nile tilapia fish in Lakes and from aquaculture facilities. The fish examined from aquaculture facility in Bantaeng has a total length of 15 to 20 cm (n= 30) and the hybrid-tilapia from a mini hatchery consist of three groups of fish size. Fish from Towuti Lake range from 7.0 to 21.8 cm in total length (n= 35), and the fish from Tempe Lake range from 10 to 16 cm in total length (n= 40). Parasite found from Nile tilapia in Tempe Lake was monogenean: Cichlidogyrus spp and Scutogyrus longicornis, and Crustacea- Argulus indicus. Parasites found from Aquaculture facility in Bantaeng were Trichodina sp, Gyrodactylus cichlidarum, Cichlidogyrus spp. and Scutogyrus longicornis. Trichodinids fround from Nile tilapia in Towuti consists of Trichodina centrostigeata, Paratrichodina sp, Trichodina sp., Trichodinella sp., and Tripartiella sp. Parasites found from red hybrid tilapia were Trichodina spp, Cichlidogyrus spp and G. cichlidarum. The prevalence and mean intensity of the parasite^s infection were discussed. In this study, we present for the first time the presence of some genera of Trichodinids in Nile tilapia in Towuti Lake. Keywords: Lake Towuti, monogenean, Nile tilapia, Prevalence, Trichodinid Share Link | Plain Format | Corresponding Author (Hilal Anshary)

4	Aquatic Biodiversity (International)	ABS-271
Mapping of Sea Urchins as a Potential Resource in the Wallacea Region: a Preliminary Review Wilma Moka1*), Dwi F. Inaku1) Aquatic Resources Management Study Program, Fisheries Department, Faculty of Marine Science and Fisheries, Universitas Hasanuddin Abstract Wallacea Region is one area in the world that is famous as an hotspot for its biodiversity. This area divided into three Sub-region: Sulawesi, Moluccas and Small Sunda. In this biodiversity hotspot, one of the most common yet unwanted is sea urchin. Sea urchin is commonly found in many marine aquatic area, including in Indonesia. . There were quite a lot of research that has been done for sea urchin, yet no database collection for the location or condition of this organism. This research aims to make a preliminary mapping of sea urchin in Wallacea Area. This research is a literature review, which collecting the literature of research that has been done for sea urchin in Wallacea area. All the location and genera or species will combine in one distribution map. The result of this research shows that many kind of sea urchin could be found in many area, mostly all area in Wallacea Region. The result of this research could became a basic data for everyone who have interest in sea urchin. Keywords: Sea urchin, mapping, Wallacea Share Link | Plain Format | Corresponding Author (Wilma Moka)

5	Aquatic Biodiversity (International)	ABS-25
Histo-anatomy and Morphology of the Aquatic Plant Bacopa amplexicaulis ((Pursh) Wettst.), B. lanigera (Cham. & Schltdl.) Wettst and B. rotundifolia (Michx.) Wettst. Nidaul Izzah 1), Media Fitri Isma Nugraha 2), Retno Lestari 1) 1. Dept. of Biology, Faculty of Mathematics and Natural Sciences, University of Indonesia. Depok, Indonesia 2. National Research and Innovation Agency of Indonesia (BRIN), Jakarta, Indonesia Abstract Genus Bacopa is known as an ornamental water plant in aquascape design. This study examined the differences in morphological and anatomical characteristics in the roots, stems, and leaves of three Bacopa species, namely B. amplexicaulis, B. lanigera, and B. rotundifolia. The identification of morphological structure was referred based on book entitled Morfologi Tumbuhan (Plant Morphology) by Tjitrosoepomo (2016)- while the anatomical identification was referring to a book of Plant Anatomy) by Crang et al. (2018). The collected data were analyzed descriptively and quantitatively. B. rotundifolia has the smallest leaf size, while B. amplexicaulis has the largest leaf size. All of the observed species had leaf anatomical characters in the form of anomocytic stomata. B. amplexicaulis had the most prominent stem diameter, measuring 4.38 cm. Trichome and aerenchyma structures were found in all stems of the test species. B. lanigera stems have the most trichomes, 72 pieces in one cross-section. Meanwhile, the longest trichome is B. amplexicaulis, which is 1,590 m. The aerenchyma of B. amplexicaulis and B. lanigera is flat, while B. rotundifolia is oval. B. amplexicaulis has the longest aerenchyma at 957 m. Only B. lanigera has a trichome on the root. Keywords: Anatomy, morphology, Bacopa amplexicaulis, B. lanigera B. rotundifolia. Share Link | Plain Format | Corresponding Author (Nidaul Izzah)

6	Aquatic Biodiversity (International)	ABS-281
The Effect Of Fermentation Time And Different Raw Materials On N And P Content As Nutrient Sources Of Caulerpa Sp. Organic Darmawati, Murni, Iman Sudrajat, Asni Anwar Unismuh Makassar Abstract Caulerpa sp. seaweed. is one of the seaweeds being developed because it has great potential in addition to being consumed by humans, but in the cultivation of Caulerpa sp. Fertilizer is needed as a source of nutrients for growth. The purpose of this study was to determine the length of time and raw materials containing the highest nitrogen and phosphate that can be used as fertilizer as a source of nutrients Caulerpa sp. The design used is a factorial pattern design with a completely randomized basic design. As for what was tested, factor A was the length of fermentation time (14, 16, and 18 days) and the second factor was raw materials (bean sprouts, Gracillaria sp. seaweed and banana weevil). The results showed that different treatments for fermentation time and raw materials had a significant effect (p<0.005) on Nitrogen and Phosphate content. The highest Nitrogen and Phosphate content was obtained at a long fermentation time of 16 days on bean sprouts raw materials of 153.398ppm and 25.585ppm, respectively. Keywords: Effect Fermentasi, Caulerpa, Seaweed Share Link | Plain Format | Corresponding Author (Asni Anwar)

7	Aquatic Biodiversity (International)	ABS-49
A Retrospective Study for Aquascape Preference among Hobbyists in Terengganu, Malaysia. Mohamad Azri Bin Mohammad1, Siti Norisikin Abas1, Mohd Ihwan Zakariah2 1 Department of Agrotechnology and Bio Industry, Politeknik Sandakan, Sabah, Malaysia 2 Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia Abstract Aquascape, decorative arts, and science that combine ornamental fish with aquatic plants in aquariums are gaining attention among hobbyists, especially in Malaysia. A study was carried out to determine the socio-economic information and hobbyist preference in Terengganu. Internet survey using Google Form was conducted for 70 hobbyists for 3 weeks in July 2021. The result indicated that aquascape in Terengganu was dominated by males (90%) and the B40 group was the majority involved in aquascape (>80%). Hobbyists preferred to have 2-3 aquariums (>70%) with sizes less than 4 feet (>50%) along with a CO2 tank (61.4%), canister filter (65.7%), and normal led light (60%). Cross-tabulation analysis showed more than 60% of newbie hobbyists faced problems in an aquascape. Pearson^s rank-order correlation indicated a low significant correlation between age, aquascape experiences, monthly income, frequent purchase, and monthly spending on aquascape. The overall results of this study indicate a promising market for aquascape in Terengganu. The results will be used as guidance to perform another study that will be covered by all other states in Malaysia. Keywords: Aquascape, ornamental fish, aquatic plants, and fisheries industry Share Link | Plain Format | Corresponding Author (MOHAMAD AZRI MOHAMMAD)

8	Aquatic Biodiversity (International)	ABS-55
Assessing the potential impact of alien fish, Pterygoplichthys pardalis in Langat River using the Generic Impact Scoring System (GISS) Nabil Arif Mohamed (a), Adibah Abu Bakar (b), Sebastien Lavoue (c), Mohammad Noor Amal Azmai (d), Intan Faraha A Ghani (a*), (a) Faculty of Engineering and Life Sciences, University Selangor, Jalan Timur Tambahan, 45600 Batang Berjuntai, Selangor *corresponding author: Dr. Intan Faraha A Ghani (intanfaraha[at]unisel.edu.my) (b) Department of Biology, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris (UPSI), 35900, Tanjong Malim, Perak, Malaysia (c) School of Biological Sciences, Universiti Sains Malaysia, 11800 Gelugor, Penang, Malaysia (d) Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia Abstract Alien invasive species such as Pterygoplichthys pardalis can exercise negative impacts. Thus, quantifying the impact of the alien fish species is crucial from a scientific standpoint and is necessary for implementing invasion-related policies and strategies. Our studies aim to (1) provide a list of invasive freshwater fish species in Malaysia including its potential impact, (2) assess and compare the potential impact of P. pardalis species that were found in Langat River. The generic impact scoring system (GISS) are selected as the system used to assess the degree of the alien species impact. A 10-category framework divided for 6 environmental and 4 socioeconomic effect that encompasses all types of affects that an alien fish species may have. The strength of impact is measured on a six-level scale in each category used to analysis available literature and online sources on the reported environmental and socioeconomics impacts of alien fish species in Malaysia. Which result shows that P. pardalis scores of 22 out of 50, the second highest among 17 species. This indicates that the species should be one of the top priorities for government management programs. In future, more research should aim to provide more on the impact of the introduced species rather than just a ^first record^. Keywords: Pterygoplichthys pardalis, Generic Impact Scoring System, Invasive species Share Link | Plain Format | Corresponding Author (nabil arif mohamed)

9	Aquatic Biodiversity (International)	ABS-56
Seasonal and Water Quality Significance of Gregarine Protozoan Parasites Occurrence in Wild Bivalve, Anadara cornea (Reeve, 1844) from Terengganu, Malaysia. Mohd Ihwan Zakariah* (a,b), Hassan Mohd Daud (b), Mhd Ikhwanuddin (a,c), Nor Asma Husna Yusoff (a), Farizan Abdullah (a), Wahidah Wahab (a), Ahmad Shuhaimi Draman (a), Ahmad Najmi Ishak (a) and Marina Hassan (a,c) (a) Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21300 Kuala Nerus, Terengganu, Malaysia. (b) Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia. (c) STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou 515063, China *ihwanz[at]umt.edu.my, ikhwanuddin[at]umt.edu.my, marina[at]umt.edu.my. Abstract Malaysia is known as a country that experience two main seasonal patterns i.e., monsoon and non-monsoon season. Three different categories of seasons based on the quantity of rainfall were divided by previous studies started from January to December 2018 which are dry season, moderate season and rainy season. Wild bivalve, Anadara cornea populations at Setiu Lagoon in Terengganu, Malaysia was examined for gregarine parasites for a year. The objective of this study was to associate the incidence of gregarine in common wild bivalves, A. cornea (Reeve, 1844) concerning seasons and water quality parameters. From the study, the total number of phagocytes found was n = 33,239 with a total of 480 host samples. The total prevalence of the parasites was 97.5% with a 95% confidence interval value which was CI=96.1% to 98.9%. The prevalence of the parasites was significantly high during the rainy season as compared to another season (dry and moderate). The findings also proved that the intensity of the parasites decreased at every transition of season. In-depth, correlation between the prevalence of the parasites vice versa season and water quality might be contributed to the intensity of the parasite infestation needs to be clarified. Keywords: protozoan parasites, gregarine, seasonal, water quality, Anadara cornea Share Link | Plain Format | Corresponding Author (Mohd Ihwan Zakariah)

10	Aquatic Biodiversity (International)	ABS-59
Heat Shock Treatments for Polyploid Induction in Clarias gariepinus: Different Time After Fertilization and Treatment Duration Ainina Ahmad Rozy (a), Roshani Othman (a), Dzulkarnain Bin Ahmad (a), Dr. Intan Faraha A Ghani (a) (a) Faculty of Engineering and Life Sciences, University Selangor, Jalan Timur Tambahan, 45600 Batang Berjuntai, Selangor Corresponding author : Dr. Intan Faraha A Ghani (intanfaraha[at]unisel.edu.my) Abstract Manipulation chromosome through heat shock treatment is safe method and can be applied to mass production in order to fulfil demand in animal food industry. The aim of the study was to evaluate how heat shock affected fertilized eggs after 4 minutes (triploid) and 40 minutes (tetraploid) of fertilization. After heat treatment of Clarias gariepinus fish eggs, the rate of abnormality of fertilized eggs were also determined. Heat shock treatments were 39, 40 and 41 degree celsius for 4 minutes, with times of 4 minutes after fertilization and 40 minutes after fertilization, with three repetitions of each treatment. The results showed that heat shock after 4 minutes of fertilization significantly affected the rate of slow embryonic development starting from the cleavage stage of 8 cell up to hatching compared to treatment 40 minutes after fertilization. The treatment with a shocking temperature of 41 degree celsius after 4 minutes of fertilization resulted in the highest percentage rate of abnormalities, 45.67%. Thus, this study revealed that tetraploid development was superior to triploid development due to higher egg abnormalities in triploid. Tetraploids are preferable as broodstocks to produce sterile triploids and can enlarge rapidly. Keywords: Clarias gariepinus, triploidy, polyploidy, heat shock, aquaculture. Share Link | Plain Format | Corresponding Author (Ainina Rozy)

11	Aquatic Biodiversity (International)	ABS-74
A Report on Introduced Amazon Sailfin Catfish, Pterygoplichthys disjunctivus in Langat River, Selangor with Notes on New Body Patterns of the Species Shatha Prkhash A/L Anand Prakash (1), Nabil Arif Mohamed (1), Mohammad Noor Amal Azmai (2), Adibah Abu Bakar (3),Roshani Othman (1), Intan Faraha A Ghani (1) 1. Department of Science and Biotechnology, Faculty of Engineering and Life Sciences Universiti Selangor, Bestari Jaya Campus, 45600 Bestari Jaya, Selangor Malaysia *Corresponding author Dr Intan Faraha A Ghani (intanfaraha[at]unisel.edu.my) 2. Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang Selangor 3. Department Biology, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris (UPSI), 35900, Tanjung Malim, Perak Malaysia Abstract Globally and locally invasive aquatic species pose a major threat towards aquatic ecosystems. Among the most successful of these aquatic invaders in Malaysian freshwater river systems is the vermiculated sailfin catfish or Pterygoplichthys disjunctivus. The study is conducted in the Langat River, a subsidiary of the Selangor River Basin which flows through the capital and highly population dense areas of the country. The impact of the species can be seen through its over population and high density in the river due to the absence of natural predators and their tolerance in low water quality environment. This study provides the first report on the occurrence of P. disjunctivus and Amazon sailfin catfish, P.pardalis had been previously reported. Selected morphometric and meristic measurements between P.pardalis and P.disjunctivus from Langat river were compared. Moreover, we also examined the body patterns of both species and the body pattern which does not fit entirely with the reported characteristics of either P.disjunctivus and P.pardalis is suspected to be a result of hybridization between both species. However, deeper study especially on the molecular aspects need to be conducted to confirm this claim. Keywords: Biological invasion, Conservation, Hybridization, Langat River, Klang Valley Share Link | Plain Format | Corresponding Author (Shatha Prkhash)

12	Aquatic Biodiversity (International)	ABS-75
A Report on Introduced Amazon Sailfin Catfish, Pterygoplichthys disjunctivus in Langat River, Selangor with Notes on New Body Patterns of the Species Intan Faraha A Ghani (1)*, Mohammad Noor Amal Azmai (2), Nabil Arif Mohamed (1), Adibah Abu Bakar (3), Shatha Prkhash A/L Anand Prakash (1), Roshani Othman (1), 1. Department of Science and Biotechnology, Faculty of Engineering and Life Sciences, Universiti Selangor, Bestari Jaya Campus, 45600 Bestari Jaya, Selangor Malaysia. *Corresponding author : Dr. Intan Faraha A Ghani (intanfaraha[at]unisel.edu.my) 2. Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang Selangor Malaysia 3. Department Biology, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris (UPSI), 35900, Tanjung Malim, Perak Malaysia Abstract Globally and locally invasive aquatic species pose a major threat towards aquatic ecosystems. Among the most successful of these aquatic invaders in Malaysian freshwater river systems is the vermiculated sailfin catfish or Pterygoplichthys disjunctivus. The study is conducted in the Langat River, a subsidiary of the Selangor River Basin which flows through the capital and highly population dense areas of the country. The impact of the species can be seen through its over population and high density in the river due to the absence of natural predators and their tolerance in low water quality environment. This study provides the first report on the occurrence of P. disjunctivus and Amazon sailfin catfish, P.pardalis had been previously reported. Selected morphometric and meristic measurements between P.pardalis and P.disjunctivus from Langat river were compared. Moreover, we also examined the body patterns of both species and the body pattern which does not fit entirely with the reported characteristics of either P.disjunctivus and P.pardalis is suspected to be a result of hybridization between both species. However, deeper study especially on the molecular aspects need to be conducted to confirm this claim. Keywords: Biological invasion, Conservation, Hybridization, Langat River, Klang Valley Share Link | Plain Format | Corresponding Author (Intan Faraha A Ghani)

13	Aquatic Biodiversity (International)	ABS-87
Community structure of the macrozoobenthos as a bioindicator of pollution in Domas Coastal Waters of Banten Bay Ramadhanti Dwi Nugrahani, Majariana Krisanti, Sulistiono* Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University (Bogor Agricultural University), Jl. Agatis, Dramaga, Bogor 16680, Indonesia. *onosulistiono[at]gmail.com Abstract Banten Bay is a water area with a depth of 50m2 with various activities in the vicinity, fishery, industry, sand mining and coastal abration to cause disruption of the balance of the aquatic ecosystem. This study aims to analyze the community structure of macrozoobenthos associated with aquatic environment condition of Domas Coastal Waters, Banten Bay. Sampling was carried out from August 2021 to January 2022 at six stations. Analysis was conducted to estimate abundance, diversity, evenness and dominance indices. Based on this study, it was obtained there were 6 classes of the macrozoobenthos, namely Bivalvia (17 genera), Gastropoda (27 genera), Echinoidea (1 genera), Polychaeta (5 genera), Malacostraca (1 genera), and Hoplonemertea (1 genera). Bivalvia and Gastropods were found in all stations. The highest total density was at Station 5 (in January), which is 2151 ind/m2 and the lowest one was at Station 3 (in August), which was 18 ind/m2. The diversity index ranged from 0.6829 to 3.3994, the evenness index ranged from 0.2941 to 1.0000, while the dominance index ranged from 0.1091 to 0.5556. The diversity value was moderate, indicating that these waters are experiencing moderate ecological stress or moderate community stability. Keywords: Aquatic environment- diversity- macrozoobenthos Share Link | Plain Format | Corresponding Author (Ramadhanti Dwi Nugrahani)

14	Aquatic Biodiversity (International)	ABS-90
Legal Protection Concerning Marine Environment And Coastal Areas Of Indonesia Based On The Convention On Biological Diversity (CBD) Tri Fenny Widayanti (a*), Eka Merdekawati Djafar (b), M. Zulfan Hakim(b), Syarif Saddam Rivanie (c) a) International Law Department, Faculty of Law, Hasanuddin University, Makassar 90245, Indonesia *trifenny[at]unhas.ac.id b)Constitutional Law Department, Faculty of Law, Hasanuddin University, Makassar, 90245, Indonesia c) Criminal Law Department, Faculty of Law, Hasanuddin University, Makassar, 90245, Indonesia Abstract The Convention on Biological Diversity (CBD) have purposes to conserve biodiversity and used the components of biological diversity in a sustainable manner. Indonesia itself has ratified this CBD through The Law Number 5 of 1994 with considerations that biodiversity including ecosystems, types and genetics of animals, plants, and micro-organisms need to be guaranteed for their existence and sustainability for life. However, the management of Marine Conservation which is also one of the implementations of CBD ratification has not provided firm and clear legal protection for the management of marine and coastal environmental areas. The management of marine conservation itself is a manifestation of sustainable development that stated in the Sustainable Development Goals, Goals 14, Conserve and Sustainability use the oceans, seas and marine resources for sustainable development and it is clearly seen that the principles of sustainable development have not been effective synergized in the implementation of CBD in Indonesia. This study uses a judicial normative approach with descriptive analytical research to describe and analyze the used of the international legal instrument in national. The Result of research are The regulation of underwater biodiversity related to a sustainable environment which regulated in various international, national and local provisions, must be explicitly determined about the importance of protecting and conserving biological diversity, including marine biodiversity. The related framework also should accommodate of its availability and ecosystems for a sustainable environment and human benefits for present and future generations. As a result of the destruction of marine ecosystems including marine biodiversity must be given sanctions for the violators, the sanctions can be in the form of administrative sanctions, criminal sanctions or civil sanctions. Keywords: Biodiversity, Indigenous, Sustainability Share Link | Plain Format | Corresponding Author (Tri Fenny Widayanti)

15	Aquatic Biodiversity (International)	ABS-109
The Abundance and Species Assemblages of Dinoflagellate Cysts at Sediments In The Three Estuaries of the Southern Part Makassar Strait, South Sulawesi Nur Inda Sari S (a*), and Nita Rukminasari (b) a) Master Program of Fisheries Science, Graduate School, Hasanuddin University, Makassar, Indonesia b) Departement of Fishery, Faculty of Marine Science and Fhishery, Hasanuddin University, Makassar, Indonesia Abstract Harmful algal blooms (HAB) is a phenomenon of drastically increasing phytoplankton population which can cause problems in aquatic ecosystems. Dinoflagellate cysts are a type of phytoplankton that are the main source of causing the HAB phenomenon, this occurs due to unfavorable environmental conditions. The Southern Estuary of South Sulawesi has high fishery resources and high primary productivity. The coastal areas around these waters are widely used for anthropogenic activities that trigger nutrient increases. There are no studies on HAB especially the abundance and community structure of dinoflagellate cysts at this location. This study aims to identify the types, abundance, and species assemblages of dinoflagellate cysts in the three estuaries of the southern part of Makassar Strait, South Sulawesi. Sampling was carried out at three locations, namely the Pappa River Estuary, the Kelara River Estuary, and the Calendu River Estuary in January 2022. Each location consists of 4 stations, 3 sub stations with 3 repetitions sampling for each sub station. Results showed that there were 34 species of dinoflagellate cysts belonging to 6 families, namely Gonyaulacaceae, Gymnodiniaceae, Osteropsidaceae, Peridiniaceae, Polykrikaceae, and Protoperidiaceae. The highest abundance of dinoflagellate cysts was at the Calendu River estuary station III accounting for 82 cysts g-1, while the lowest abundance of dinoflagellate cyst was found at Pappa River estuaries stations I and II, accounting for 8 cysts g-1. The level of diversity, uniformity, and richness of dinoflagellate cysts was not significantly different in the three study sites. The family Osteropsidaceae was the most common type of dinoflagellate cyst found in the three study sites. The Osteropsidaceae family is a type of dinoflagellate cyst that contains toxins, so it can be assumed that the three research sites have the potential for HAB. Keywords: Dinoflagellate Cysts- Harmful Algal Blooms- Abundance- Species Assemblages- Pappa, Kelara, and Calendu Estuary- Makassar Strait Share Link | Plain Format | Corresponding Author (Nur Inda Sari S)

16	Aquatic Biodiversity (International)	ABS-111
Single Nucleotide Polymorphisms (SNPs) in the immunoglobulin M heavy chain gene of five African catfish (Clarias gariepinus) strains in Indonesia Huria Marnis*, Khairul Syahputra, Bambang Iswanto *Research institute for fish breeding, Subang Abstract A single nucleotide polymorphism (SNP) represents the most abundant genetic variants among individuals. While most of the SNPs do not show functional impact, some are functional and cause important phenotypic effects. This study was aimed to evaluate SNPs in immunoglobulin M (IgM) heavy chain assumed to affect the immune system in five African catfish strains, namely Dumbo, Sangkuriang, Paiton, Masamo and Egypt. Genomic DNA was extracted from caudal fins and IgM heavy chain gene was partially amplified in a PCR system, cloned using pJET1.2, and sequenced. Strains were characterized based on morphological analysis. The resulting data were aligned to the NCBI database. Three hundred and five nucleotide sequences were successfully sequenced from Sangkuriang, Paiton, Egypt, and Masamo that encode 101 amino acid residues, while Dumbo strain had 229 nucleotide sequences encoding 99 amino acid residues. Blastn analysis showed that IgM heavy chain sequences of Paiton, Sangkuriang, Masamo, and Egypt had similarity (85%) to channel catfish (Ictalurus punctatus), and 82% identity was found between Dumbo IgM heavy chain and channel catfish. A total of 54, 53, 53, 53, and 52 SNPs were observed in Dumbo, Paiton, Sangkuriang, Egypt, and Masamo strains, respectively, and all existed in coding region (exon). Analysis of the alignment of IgM heavy chain sequences among strains revealed that Dumbo had a greater number of SNPs (10 sequences) than other strains. Nonsynonymous nucleotide substitutions existed in the exon, thereby altering the amino acid product. Dumbo, Paiton, Masamo, and Sangkuriang strains had similar morphologies, except for Egypt. The Egypt strain had unique morphology. This study indicated that the structure of the IgM heavy chain gene might be associate with differences in immune performance among the five African catfish strains. Keywords: Single nucleotide polymorphism- Immunoglobulin heavy chain gene- Clarias gariepinus- Cloning Share Link | Plain Format | Corresponding Author (Huria Marnis)

17	Aquatic Biodiversity (International)	ABS-114
Phytoplankton Community Structure in Estuaries of Kemayungan-Linduk and Adjacent waters of Banten Bay, West Java, Indonesia Sulastri1 and Sulistiono2 1Research Center for Limnology, National Research and Innovation Agency, Republic of Indonesia, Jl. Raya Bogor-Jakarta, Km 46, Cibinong. Indonesia. 2Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University (Bogor Agricultural University), Jl. Agatis Darmaga Bogor, Bogor 16680, Indonesia. Abstract Abstract. Surrounding area of Banten Bay is an urban area which make estuaries and coastal areas at the bay are very vulnerable to the pollution and sedimentation. This study aims to determine phytoplankton community structure in Kemayungan-Linduk estuaries and the adjacent waters of Banten Bay . Samples were collected at 6 stations in February to April 2021. The data included environmental factors, phytoplankton composition and abundance, species richness, diversity and evenness index. Water quality showed a high variability during observation. Low Transparency (20-47 Cm), turbidity (13-49 NTU, salinity (0 to 9 o/oo and TTS (39.5 to 134 mgL-1) and higher nitrate (concentration was recorded in Linduk estuary. Phytoplankton consisted of Chrysophyceae, Bacillariophyceae, Chlorophyceae, Cyanophyceae, Dinophyceae dan Euglenophyceae with Bacillariophyceae as a dominant group contributed 54.1 % to 100 % of total abundance. The highest percentage of Bacillariophyceae was recorded in coastal water and Estuary of Kemayungan River. Higher percentage of Cyanophyceae was recorded in Linduk Estuary while higher percentage of Euglenophyceae was recorded in Kemanyungan estuary. Phytoplankton abundance (743 to 35076 individualL-1), number of species (16 to 31), diversity index (0.83 to 2.93), species richness (1.32 to 4.39) and evenness ( 0.296 to 0.981) show a large heterogeneity across sampling site and sampling time. Low diversity index and species richness classified as moderately ecological stress was recorded in coastal waters of Kemanyungan estuary. Keywords: Phytoplankton, diversity, pollution , Estuary. Share Link | Plain Format | Corresponding Author (Sulastri Sulastri)

18	Aquatic Biodiversity (International)	ABS-117
Isolation and Characterization of Thermophilic Bacteria from Waepella Hot Spring for Amylase Production Indrayani Indrayani1*, Subari Yanto1, Amiruddin Hambali1, Ardiansyah Ardiansyah2 1Study Program of Agricultural Technology Education, Faculty of Engineering, Universitas Negeri Makassar, South Sulawesi, Indonesia 2Aquaculture Department, Agricultural Polytechnic State of Pangkep, Makassar-ParePare Km. 83, South Sulawesi, Indonesia Corresponding author: indrayani[at]unm.ac.id Abstract Bacteria are group of organisms commonly found in extreme habitats including hot springs. Bacteria that live in extreme habitats have the potential to produce commercial products, including the amylase enzyme which is widely used in the food and beverage industries. This study aims to obtain isolates of thermophilic bacteria from Waepella hot springs in Sinjai Regency, South Sulawesi which have the potential to be developed as amylase enzyme producer. Water samples were taken at 3 points with temperatures of 49, 53 and 550C, respectively. Bacterial isolation was carried out using the agar plating technique on TSA media. Pure bacterial isolates were obtained by repeated streaking on TSA media. The isolates obtained were then characterized by morphology, gram staining, catalase test, endospore test and amylolytic test. There are 20 isolates successfully obtained, 9 of which have the ability to produce amylase enzymes. ISO SS 55 isolate was the isolate with the highest amylolytic activity with a clear zone diameter of 23 mm. This isolate has the potential to be developed as a producer of amylase enzymes. Keywords: extremophile bacteria, hot springs, amylolytic activity Share Link | Plain Format | Corresponding Author (Indrayani Indrayani)

19	Aquatic Biodiversity (International)	ABS-125
Meroplankton in Ambon Bay Fismatman Ruli, Nining Betawati Prihantini, Sem Likumahua, Tri Widodo, Malik Sudin Abdul, Syafrizal, Iskandar Abd. Hamid Pelupessy Faculty of Mathematics and Natural Sciences, Universitas Indonesia. Research Center for Deep Sea, National Research and Innovation Agency (BRIN). Abstract Here we present the study of meroplankton in Ambon Bay. This study aims to determine the composition and abundance of meroplankton in Ambon Bay. Seventeen stations (nine in the inner Ambon Bay and eight in the outer Ambon Bay) were sampled in march 2022. A plankton sampling was carried out using a plankton net with a mesh size of 300 microns and a diameter of 30 cm drawn at a depth of 10 meters to the surface. The study results showed that the meroplankton in Ambon Bay at the time of observation consisted of several fish larvae and eggs, Echinodermata larvae, and Mollusca, Decapoda larvae, Cirripedia larvae, Stomatopoda larvae, and Anellida larvae. The abundance of meroplankton in the inner Ambon Bay is higher than in the outer. The meroplankton group was dominated by Echinodermata larvae, which were found to dominate at all research stations, especially in the inner bay of Ambon, with the highest abundance found at station 4, which was 120.31 ind/m3. The second and third dominating groups are from Decapoda Larvae, especially Brachyura (Zoea Stage) and Fish Eggs. Keywords: Abundance, Ambon Bay, Composition, Meroplankton Share Link | Plain Format | Corresponding Author (Fismatman Ruli)

20	Aquatic Biodiversity (International)	ABS-160
GROWTH OF SEPAT SIAM FISH IN FLOOD SWAMPS, SOUTH SUMATRA Mirna Dwirastina dan Yoga Candra Ditya brppupp Abstract Sepat Siam fish (Trichogaster pectoralis) is a black fish that usually lives in river waters and flooded swamps. South Sumatra is famous for some of the areas being flooded swamp areas and very suitable for the habitat of the Sepat Siam fish. The flow of the Muara Belida river, especially the Kayu Ara Batu Village, is a flooded swamp area where many Sepat Siam fish are found. This fish is one of the economical fish and is very common throughout the year. The research was conducted in 2021 in March, April, May, June and July in Kayu Ara Batu Village. Fish samples were taken from the enumerator^s catch and then the length and weight of 3037 Sepat Siam fish were measured and analyzed using Fisat Analysis II. The purpose of the study was to find out about the growth of the Sepat Siam fish in flooded swamps. The results obtained are that the infinitive length of the sepat fish is 45.68 with a value of K = 0.090, M = 0.33, Z = 0.35. F=0.02 and E= 0.06 . Thus, the exploitation rate is still smaller than the optimum exploitation value so that the fish catch is still good and has not caught more but is still in the good and controlled fishing category. Keywords: Fisat analysis, Siamese Sepat Fish, Estuary Belida, Growth,Flood swamp, South Sumatra Share Link | Plain Format | Corresponding Author (Mirna Dwirastina)

21	Aquatic Biodiversity (International)	ABS-175
Improve Spawning Quality of Kissing Gourami (Helostoma temminckii) with Commercial Feed Containing Glutathione and Different Level Vitamin E Indira Fitriliyani1) , Octaviana Dewi Syahputri2) 1) Lecture Fisheries dan Marine Faculty Universty of Lambung Mangkurat 2) student Fisheries dan Marine Faculty Universty of Lambung Mangkurat Abstract The supply of fish that rely on catches in nature cannot meet the needs market continuously, so research is needed to accelerate spawning through additional glutathione and vitamin E in commercial feed to produce quality fish fry. This research aims to determine the effect of the addition of vitamin E in the commercial feed containing glutathione to increase the spawning of kissing gourami, among others, hatching rate, the egg diameter, and the survival rate. The maintenance of kissing gourami had done for two months. The research used a Completely Randomized Design (CRD) with 4 treatments and 3 replications. Treatment A (Glutathione), B (Glutathione and Vitamin E 150 mg.kg-1), C (Glutathione and Vitamin E 300 mg.kg-1), and D (Glutathione and Vitamin E 450 mg.kg-1). Feeding three times a day morning, noon, and evening with 5% of the weight of the fish body. The result showed that all parameters were significant. The highest hatching rate was 99,67% in treatment D. Egg diameter in the treatment of C gave the best result was 0,88 mm. The highest fecundity was 21.257 grains in treatment D. The highest survival rate was 95,56% in treatment D. The addition of glutathione and vitamin E on commercial feed could improve the spawning kissing gourami fish and the optimum dosage of vitamin E is 282 mg.kg-1. The range of water quality^s value during the research was within normal range. Keywords: Glutahtione, kissing gourami fish, spawning quality, vitamin e Share Link | Plain Format | Corresponding Author (Indira Fitriliyani)

22	Aquatic Biodiversity (International)	ABS-194
Productivity of Peurulus Catch in Binuangeun Waters Banten Province Evan Danisworo (a*), Adi Susanto (a), Hery Sutrawan Nurdin (a) Department of Fishery Science, Faculty of Agriculture, University of Sultan Ageng Tirtayasa, Serang, Indonesia. Abstract Spiny lobster (Panulirus sp.) is one of the leading commodities of capture fisheries with high economic value. Besides, come from fishing activities, spiny lobster production is also generated from marine culture activities. However, peurulus as a seed in lobster culture is still dominated by catching in its natural habitat. Binuangeun water is one of the main fishing grounds for peurulus catch in Banten Province. The fishers used small boats or rafts to catch the peurulus. The purpose of this study was to determine the productivity of peurulus catch in Binuangeun waters Banten Province. The research was conducted from March to April 2022 by following 10 trips of fishing activities on boats and rafts respectively. The results show the average caught of a small boat is 40,7 peurulus per night. Moreover, the productivity of raft reach 23,7 peurulus per night. The peurulus catch composition was dominated by Panulirus homarus (97,3%) and Panulirus ornatus (2,4%). The average length of Panulirus homarus and Panulirus ornatus were 53,2 mm and 60,1 mm respectively. Keywords: Binuangeun, composition, lobster, peurulus Share Link | Plain Format | Corresponding Author (Evan Danisworo)

23	Aquatic Biodiversity (International)	ABS-202
The Data Supply of Anguilla spp. Population in East Kalimantan R. Andry I. Sukmoputro1, Andrian Saputra1, Ratih Tribuwana D.1 , Hetty Priyanti E.1, M.A. Riandyka1, Kaisar P. Hasudungan1, Despriyanto Supriadi1 1 Regional Office for Marine and Coastal Resources Management of Pontianak (BPSPL Pontianak), Directorate General of Marine Spatial Management, Ministry of Marine Affairs and Fisheries of the Republic of Indonesia Abstract BPSPL Pontianak has been conducted survey to collect the population data of Anguilla spp., in East Kalimantan aims to enrich both eel^s data and information in Indonesian waters, particularly an endemic eels of Borneo island, Anguilla borneensis, refers to enactment Ministerial Decree of Marine Affairs and Fisheries of The Republic of Indonesia Number 80/KEPMEN-KP/2020 On Eels (Anguilla spp.) Limited Protection. The survey was conducted from January to September 2021 on Mahakam river, Kutai Kartanegara as known as eels habitat. The data collected using census method by assigning enumerators. Identification of mature eels using morphological characters as ano-dorsal length, the maxillary bands of teeth, color marking, also based on morphometric data (AD%) and convinced with DNA analysis. Yellow and silver eel were caught throughout the year from the estuary, Muara Handil to the upper reaches of the Mahakam river, Kota Bangun-Muara Kaman, had three species i.e., Anguilla marmorata, Anguilla borneensis and Anguilla bicolor not specified in the subspecies, with DNA test results > 97% in each species. Whereas glass eels were caught only on Loa Janan, Harapan Baru, Loa Kulu Seberang, Banua Puhun-Muara Kaman at the date 16th to 22nd Dzulhijah of 1443 Hijriah in the Islamic calendar, glass eel lenght 50-70 mm and weight 0.15-0,18gram, the DNA result showed as Anguilla borneensis with similarity index 98.31%. Total catch of glass eel in July 2021 is 88.7kg with the average catches per day is 17.74kg, the Catch Per Unit Effort (CPUE) value using a hand scoop or tanggok is 0.100 kg per fishing effort with an average of 0.020 kg per fishing effort. Based on cumulative catch and catch per effort can obtained Anguilla borneensis population presumption as much 452.5kg. Keywords: eels, endemic, East Kalimantan, population, A.borneensis. Share Link | Plain Format | Corresponding Author (R. ANDRY INDRYASWORO SUKMOPUTRO)

24	Aquatic Biodiversity (International)	ABS-208
Disappearance or Overlooked or Untouched? - A Brief History of Aquatic Gastropoda of Malaysian Borneo Abdulla-Al-Asif (a*), Hadi Hamli (a), Mohd Hanafi Idris (b), Carles Gili (c), AFM Arifur Rahman (b), Abu Hena Mustafa Kamal (b**) Abstract The aquatic Gastropoda (marine and freshwater) in Malaysian Borneo (MYB) has an ancient history of 255 years, while the first record was observed in 1767 by the pioneer Carl Linnaeus. With time, many European, native taxonomists and conservationists worked on the diverse group of Gastropoda in the Malaysian part of Borneo (states of Sabah and Sarawak). No previous work was conducted to assess the historical existence of this particular class of Mollusca. The study^s objective was to reveal the types of aquatic gastropods in MYB and the number of published research and expeditions conducted herein. The bibliometric analysis suggested that 145 research publications were mentioned the names of the region where they reported at least one species from this geographic region. Within the history of 255 years, a total of 559 species of gastropod were reported by the different research groups. Between 1767 and 1900, a total of 150 gastropod species were reported, followed by 79 species from 1900 to 2000 and 330 species from the year 2001 to 2022. The Grubbs test (p<0.05) suggested that the most outlier year in reporting of species was 2011, while it recorded 54 new species from MYB, followed by 2020 (54 species), 2001 (39 species). The most contributing taxonomist in MYB within the history of aquatic gastropod research was Han Raven and his colleagues from NBC, The Netherlands, who reported 111 new species from the region followed by Nur Leena Wong from UPM (54 new species). The finding suggested that reporting of new species from MYB is increasing, which can be interpreted as the many unexplored new sites and species still exist in this ecoregion. In this regard more expedition works, and research dimensions might help to know the exact number of aquatic gastropod species in this area. This observation will help the regional governments in making the regional biodiversity database as well as to take decision for research initiative on aquatic gastropod and management. Keywords: Biodiversity, Taxonomy, Borneo, Mollusca, Natural History Share Link | Plain Format | Corresponding Author (Abdulla Al-Asif)

25	Aquatic Biodiversity (International)	ABS-212
Turf Algae Dynamics in the Coral Reef Ecosystems of the Spermonde Archipelago Gunawan Syafruddin(1), Estradivari(2-3), A. M. Agung Pratama Abdurrahman(1), Inayah Yasir(4), Rohani Ambo-Rappe(4) (1)Master Student in Marine Science Study Program, Faculty of Marine Science and Fisheries, Hasanuddin University, Indonesia (2)Department of Ecology, Leibniz Centre for Tropical Marine Research (ZMT), Germany (3)Department of Marine Ecology, Faculty of Biology and Chemistry, University of Bremen, Germany (4)Marine Science Department, Faculty of Marine Science and Fisheries, Hasanuddin University, Indonesia Abstract Turf algae are common in coral reef ecosystem benthic communities. Comprised of many small algae and the juvenile phase of some macroalgae, turf algae are generally formed by filaments up to 2 cm high. Turf algae play an important role in coral reef ecosystem dynamics and changes in their abundance are often associated with changes in coral cover. Turf algae abundance is intrinsically linked to the influence of anthropogenic activities on coral reef ecosystems. Damage to coral reefs can increase turf algae cover, which can trigger a phase shift from coral-dominated to algal-dominated reefs. Algal turf cover and abundance in a given coral reef area can be influenced by many factors, including distance from the mainland. This study examined the dynamics of algal turf cover in shallow reefs around eight islands representing the different zones of the Spermonde Archipelago, Indonesia based on distance from the Sulawesi mainland (Lae-Lae, Samalona, Barranglompo, Badi, Bonetambung, Lumu-lumu, Gusung Karang Kassi, and Kapoposang). Turf algae percentage cover data were collected in plots along line transects at each site. The dominant cover category tended to differ among inshore-offshore spatial gradient, and was also influenced by anthropogenic and natural factors, including coral reef cover, rugosity, nutrient concentrations, and predators. Keywords: turf algae, benthic cover category, coral reef, spatial gradient Share Link | Plain Format | Corresponding Author (Gunawan Syafruddin)

26	Aquatic Biodiversity (International)	ABS-219
Diversity and abundance of Intertidal Biota in front of Shrimp Ponds on Lombok and Sumbawa Island Edwin Jefri (a,c*), Jamaluddin Jompa (a), Nadiarti (a), Tim Jennerjahn (b), Nurliah Buhari (c) a) Hasanuddin University, Indonesia Jl. Perintis Kemerdekaan KM.10, Makassar 90245, Indonesia ejefri[at]unram.ac.id b) Leibniz Centre for Tropical Marine Research (ZMT), Germany Fahrenheitstrabe 6, 28359 Bremen, Germany c) University of Mataram, Indonesia Jl. Majapahit No.62, Mataram 83115, Indonesia Abstract The existence of shrimp ponds with intertidal water conditions is closely related, especially the presence of waste from aquaculture activities with the presence of intertidal biota. This study aims to determine the biodiversity and abundance of intertidal biota in front of shrimp ponds on the islands of Lombok and Sumbawa. Sampling was carried out using the line transect method at low tide. Species richness, composition, abundance, and diversity indices such as diversity index (H^), dominance index (D) and uniformity index (E) were observed. The results showed that there were 27 species found from Lombok waters and 16 species from Sumbawa waters. The highest value of species richness, abundance, value of H^ and E came from the island of Lombok. Each value is for H^ (2.708) in Lombok and H^ (2.343) in Sumbawa, D (0.074) in Lombok and D (0.125) in Sumbawa. E (0.633) in Lombok and E (0.541) in Sumbawa. Keywords: Diversity, Pond, Intertidal, Lombok, Sumbawa Share Link | Plain Format | Corresponding Author (Edwin Jefri)

27	Aquatic Biodiversity (International)	ABS-234
Conditions of megabenthos on coral reef ecosystem in Seribu Islands National Park, Jakarta Dedy Kurniawan(1), Risandi Dwirama Putra(2), Rikoh Manogar Siringoringo(3), Ni Wayan Purnama Sari(3), Muhammad Abrar(3), Tengku Ersti Yulika Sari(4), and Hasnarika Hasnarika(5) (1)Department of Aquatic Resource Management, Faculty of Marine Science and Fisheries, MUniversity of Maritim Raja Ali Haji, Tanjungpinang, Indonesia (2)Department of Naval Architecture, Faculty of Engineering, University of Maritim Raja Ali Haji, Tanjungpinang, Indonesia (3)Research Centre for Oceanography, National Research and Innovation Agency, Indonesia (4)Department of Fishing Technology, Faculty of Fisheries and Marine Science, University of Riau, Pekanbaru, Indonesia (5)Department of Accounting, Institute of Economic Science Pembangunan Tanjungpinang, Indonesia Abstract Seribu Islands National Park is located off the north coast of Jakarta which consists of 110 islands with an area of 108,000 hectares, with an elongated position from north to south marked by small white sandy islands and coral reefs. This study aims to determine the distribution and density of megabenthos in coral reef ecosystems in the Seribu Islands National Park. This research was conducted in November 2021, in the waters of the Seribu Islands National Park. Megabenthos observations were carried out using the Benthos Belt Transect method which is a development of the Belt Transect Method for monitoring megabenthos combined with the Reef Check Benthos method. Based on observations in the waters of the Seribu Islands National Park, five types of megabenthos were found, including clams (Tridacna sp.), lola (Trochus sp.), spiny starfish (Acanthaster planci), drupella (Drupella sp.), and sea urchins (Diadema sp.). The highest density of megabenthos was found on Kayuangin Genteng Island with a density of 8,786 ind/ha, while the lowest was on Peteloran Barat Island 429 ind/ha. Based on the type of megabenthos at all observation stations, the most abundant megabenthos found was Diadema sp. with a density of 43,397 ind/ha, while the least was Acanthaster planci of 214 ind/ha. Keywords: Megabenthos- Coral Reef- Seribu Islands National Park Share Link | Plain Format | Corresponding Author (Dedy Kurniawan)

28	Aquatic Biodiversity (International)	ABS-251
Megabenthos Monitoring in Ternate, North Maluku Putri Sapira Ibrahim (a*), Sugeng Purwo Saputro (b), Fione Yukita Yalindua (a), Ana Faricha (a), Teddy Triandiza (a), Agus Kusnadi (a) a) Research Center for Oceanography, National Research and Innovation Agency (BRIN), Jakarta 14430, Indonesia b) Research Center for Geological Resources, National Research and Innovation Agency (BRIN), Bandung 40135, Indonesia Abstract Several megabenthos groups have important economic and ecological values- also play an important role in the condition and stability of coral reef ecosystems. The important role of this megabenthos group makes it a potential object as an indicator to assess coral reef health. This study aimed to determine the condition of coral reefs by monitoring the megabenthos. The targeted megabenthos in this study consisted of seven groups (Sea Urchins, Sea Cucumbers, Blue Starfish, Clams, Drupella, Lola, Acanthaster planci, and Lobsters). Data collection was carried out in Ternate Waters at 14 stations using the Benthos Belt Transect method. The analysis was carried out by examining the presence and the number of species, distribution and density of each station, density of each type of megabenthos, and ecological indices (dominance index, diversity index, and evenness index). The results of the study found a total of 375 individuals. The group of megabenthos species that were always found at each station was coral polyp-eating snails (Drupella). On the other hand, Acanthaster planci and lobster are a group of megabenthos species found only at a few stations. Overall, Drupella was the most dominant type of megabenthos during observation. That is thought to be related to overfishing at that location. Several groups of fish are natural predators of Drupella. Their numbers in the wild are decreasing due to overfishing. The dominance that occurred during observations was closely related to the health condition of coral reefs and the diversity of coral species as the habitat of megabenthos. Keywords: Ecology, Monitoring, Benthos Belt Transect, Megabenthos, North Maluku Share Link | Plain Format | Corresponding Author (Putri Sapira Ibrahim)

29	Aquatic Biodiversity (International)	ABS-252
Sedimentation rate in mangroves with different characteristics Supriadi Mashoreng (1*), Rahmadi Tambaru (1), Yayu Anugrah La Nafie (1) (1) Faculty of Marine Science and Fisheries, Hasanuddin University, Makassar. * smashoreng[at]gmail.com Abstract One of the roles of mangrove forest is their ability to deposit sediment. This roles can prevent excessive suspended sediments from reaching other ecosystems such as coral reefs. This study aims to analyze the rate of sedimentation in rehabilitated and natural mangroves. The research was conducted at two locations, namely the Lantebung mangrove area, Makassar which represents the mangrove rehabilitation and the Kuri Maros mangrove area which represents natural mangroves. Four stations were made at each location. Sequentially, Station 1 is closest to the mainland and Station 4 is furthest from the mainland. At each station, 6 sediment traps were installed which were made of 7.4 cm diameter and 20 cm high pipes. After 14 days the trapped sediment was taken and brought to the laboratory. The sediment was dried using an oven, then weighed to determine the weight and the volume was measured. The results showed that the sedimentation rate in the Lantebung mangrove area ranged from 1.03 to 69.93 g.m-2.day with an average of 28.13 g.m-2.day. Sedimentation rate in the Kuri mangrove area ranges from 18.22-251.68 g.m-2.day with an average of 93.42 g.m-2.day. The further outward (the sea), the higher the sedimentation rate. Keywords: sedimentation rate, natural and rehabilitated mangrove, Lantebung Makassar, Kuri Maros. Share Link | Plain Format | Corresponding Author (Supriadi Mashoreng)

30	Aquatic Ecology and Conservation (International)	ABS-257
Study of organic content and grain size sediment that affect water quality in the coastal area adjacent IMTA cages of Menjangan Besar Island, Karimunjawa, Jepara Nuke Hawarizqi1, Sapto P. Putro2, Endah Dwi Hastuti3, Muhammad Helmi4, Satriyo Adhy5Hawarizqi, Sapto Purnomo Putro, Endah Dwi Hastuti 1Department of Biology, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia 2Center of Marine Ecology and Biomonitoring for Sustainable Aquaculture, Diponegoro University, Semarang, Indonesia 3Department of Biology, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia 4Department of Oceanography, Faculty of Fishery and Marine Science, Diponegoro University, Semarang, Indonesia 5Department of Informatics, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia Abstract The biotic and abiotic parameters of the waters influence each other so that the life of marine biota is greatly supported by the good quality of the aquatic environment. The purpose of this research is to determine the water quality based on physicochemical parameters in the IMTA cultivation area compared to the reference area which is about 1 km away on Menjangan Besar Island. The samples were taken in May and December 2019 and taken in two different locations, IMTA and the reference area. Physical and chemical parameters such as temperature, pH, salinity and DO, the grain size of the substrate and the content of organic matter C-organic, N-total and phosphate. Based on KEPMEN-LH No. 51 of 2004, the parameters that exceed the threshold are temperature, DO, phosphate and pH, salinity, substrate grain size, C-organic, and N-total values are still below the threshold that supports the life of marine biota. Varied results of physicochemical parameters are influenced by seasons, household waste, and cultivation activities Keywords: water quality, marine ecosystem, abiotik parameters, organic content, Menjangan Besar Island Share Link | Plain Format | Corresponding Author (Nuke Hawarizqi)

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