Tirtadanu, Umi Chodrijah, Prihatiningsih, Sri Turni Hartati, Tri Retnaningsih Soeprobowati, Agus Heri Purnomo, Syarif Prasetyo, Jumari, Ari Wahyono
As the target species of fishermen in Lake Batur, tilapia (Oreochromis niloticus) population has declined, threatening the economic loss of the fisheries community. Furthermore, Midas cichlid (Amphilophus citrinellus), which has low economic value, has also dominated the fisher's catch in Lake Batur, reducing the catch of the target species. Stock assessment for both species is needed to develop proper management. This study aimed to assess the stock status of tilapia and Midas cichlid for fisheries management recommendations. Some population characteristics were obtained based on monthly data in 2023, and the stock status was determined by the yield per recruit and spawning potential ratio analysis. This study revealed that A. citrinellus in Lake Batur is more resistant than O. niloticus, indicated by the faster growth, better fatness and larger spawning stock biomass of A. citrinellus than O. niloticus. The current stock status of O. niloticus is in a recruitment overfishing condition, while the status of A. citrinellus is underfished. Several management measures are needed to increase tilapia’s spawning stock biomass, improve the ecosystem's quality, limit the population of A. citrinellus and raise the economic value of A. citrinellus through processing and market development. © 2024, BIOFLUX SRL. All rights reserved.
Research Center for Fishery, National Research and Innovation Agency (BRIN), Cibinong, Indonesia; Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN), Cibonong, Indonesia; School of Postgraduate Studies, Diponegoro University, Semarang, Indonesia; Research Center for Society and Culture, National Research and Innovation Agency (BRIN), Jakarta, Indonesia; Faculty of Mathematics and Natural Science, State University of Surabaya, Surabaya, Indonesia; Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia
