Comparative Study of Plankton Structure at Monoculture and Integrated Multi-Trophic Aquaculture (IMTA) Floating Net Cages at Coastal Area of Menjangan Besar, Karimunjawa Islands, Indonesia
Siti Saodah Rifahyanti (1*), Sapto Purnomo Putro (2), Riche Hariyati (1), Murningsih (1)

(1) Department of Biology, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia (2) Center of Marine Ecology and Biomonitoring for Sustainable Aquaculture (Ce- MEBSA), Diponegoro University, Semarang, Indonesia

Abstract

The study on the structure of the plankton community in Monoculture and Integrated Multi-Trophic Aquaculture System (IMTA) Floating Net Cages at Karimunjawa Islands was conducted in October 2021. This study aimed to assess the structure of the plankton community along with water quality parameters in those areas. Sampling was carried out by using the filtration method with a plankton net at three locations, namely monoculture, IMTA floating net cages, and reference area. The study discovered 40 species consisting of 22 species of phytoplankton and 18 species of zooplankton. The phytoplankton found were Bacillariophyceae, Cyanophyceae, and Dinophyceae classes, while the zooplankton found were Ascidiacea, Branchiopoda, Eurotatoria, Hexanauplia, Malacostraca, Secementea and Thecostraca classes. The abundance of phytoplankton ranged from 767 - 3067 cells/L, while abundance of zooplankton ranged from 600 - 3833 cells/L. The biological index of phytoplankton showed the diversity index (H) between 1.26 - 2.27, the evenness index (E) between 0.4 - 0.17, and the dominance index (D) between 0.46 - 0.72. The zooplankton biology index showed the value (H) between 1.44 - 2.28, the value (E) is between 0.67 - 0.99 and the value (D) is between 0.11 - 0.19. Water quality in the form of lightness between 5.1 - 7.38 m, water temperature between 24.53 - 25.8 oC, turbidity between 0 - 0.48 NTU, DO between 1 - 14.74 mg.L-1, pH between 5.75 - 9.55, salinity between 29.5 - 33 o/oo and TDS between 8.94 - 18.9 ppm. The results of the parametric data test using One-Way analysis of variance (ANOVA) showed that the abundance of plankton structure at the three locations was significantly different (p<0.05).

Keywords: Plankton Structure- IMTA- One-Way ANOVA- Karimunjawa

Topic: Aquatic Ecology and Conservation (International)