Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Acoustic-based estimation of fish stocks in Widas Reservoir, East Java, Indonesia

  • Siti Nurul Aida (Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN)) ;
  • Agus Djoko Utomo (Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN)) ;
  • Safran Makmur (Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN)) ;
  • Tuah Nanda M. Wulandari (Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN)) ;
  • Khoirul Fatah (Research Center for Conservation of Marine and Inland Water Resources, National Research and Innovation Agency (BRIN)) ;
  • Yosmaniar (Research Center for Marine and Land Bioindustry, National Research and Innovation Agency (BRIN)) ;
  • Indra Suharman (Department of Aquaculture, Faculty of Fisheries and Marine Sciences, Universitas Riau) ;
  • Ulung Jantama Wisha (Research Center for Oceanography, National Research and Innovation Agency (BRIN))
  • Received : 2023.10.28
  • Accepted : 2023.12.28
  • Published : 2024.04.30
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Abstract

Widas Reservoir is situated in an area of 570 ha in the Pajaran Village, Madiun Regency, East Java Province, Indonesia, playing an essential role in fisheries, with the average fish catch per year of about 283 tons/year. This study explores the standing stock, growth parameters, mortality, and exploitation rates of several dominant fishes in Widas Reservoir. This study was carried out from February to November 2019. Fish stocks were estimated using acoustic tools, fish catch records, and sizes collected by local enumerators. Fish length frequency sampling was conducted on several dominant fish species, such as Oreochromis niloticus, Barbonymus gonionotus, and Osteochilus vittatus. Based on the length-frequency data, estimating fish population dynamics, the fish population dynamics (infinitive length (L∞) and growth coefficient (K)) estimation was run in a time series using the Fish Sock Analysis Tool, II (FISAT II) program package. Moreover, the estimation of natural mortality parameters, the fishing mortality parameter, and the exploitation rate was also performed. The approximated overall fish stock in the Widas Reservoir was about 79,848 kg, which lowered with the increase in water depth. Of particular concern, in the surface layer at a depth between 1-5 m, the fish stock reached 58,813 kg, while in the deeper zone (> 15 m), the value significantly lowered by about 98%, reaching 1,219 kg. These results indicate an overfishing in the Widas Reservoir. The value of the exploitation rate (E) of B. gonionotus was 0.748, O. niloticus 0.8, and O. vittatus 0.7, respectively, proving the overfishing states occurred in the study area. Therefore, regulations governing the number of catches and the use of fishing gear are crucial in Widas Reservoir, particularly the use of lift and gill nets with a mesh size of less than 2 cm.

Keywords

Acknowledgement

The authors would like to thank Research Institute for Inland Fisheries and Fisheries Extension Palembang for all supports during this research implementation, research team colleagues who have helped during the research and the fishers as enumerators who helped in the data collection.

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