Biological Aspects of the Halfbeak Fish Dermogenys orientalis (Weber, 1894) in the Manrepo River, Maros-Pangkep Karst Region, South Sulawesi, Indonesia Adnan Aswad, Mohammad Tauhid Umar, Joeharnani Tresnati
Department of Fisheries, Faculty of Marine Sciences and Fisheries, Hasanuddin University
Abstract
Halfbeak fish Dermogenys orientalis (Weber, 1894) is an endemic fish in the Maros-Pangkep Karst Region which humans have inhabited since 30,000 years ago. Halfbeak fish is not a consumption fish but has a high economic value because it is an ornamental fish. Degradation of river water quality due to domestic waste and environmentally unfriendly fishing using electricity and poisons threaten the existence of this karst endemic fish, so the biological aspects of halfbeak fish need to be studied to determine its sustainability aspects. This study analyzes biological aspects, including the Length-weight equation and condition factors for halfbeak fish caught in the Manrepo River, Maros Regency, South Sulawesi, Indonesia. The number of halfbeaks fish found was 606, consisting of 194 fish at Station 1, 199 at Station 2, and 213 at Station 3. The Length-weight equation of halfbeak fish was W = 0.00002L2.5629 at Station 1, W = 0.00003L2.4542 at Station 2, and W = 0.00005L2.3465 at Station 3. The growth pattern of halfbeak fish based on a station and sampling periods were hypoalometric, except for the June 2021 sampling, an isometric growth pattern was obtained. The value of the halfbeak fish condition factor was more significant than one, which indicates that the halfbeak fish has good physical conditions for survival and reproduction
Keywords: Length-weight equation, condition factor, hypoallometric, isometric, endemic fish
