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<p>Estuarine gillnet fisheries play a critical role in supporting small-scale livelihoods. However, information on gear selectivity and catch category structure remains limited in tropical systems. This study assessed the catch composition and selectivity of gillnet fisheries targeting the giant sea catfish <i>Netuma thalassina</i> in the estuarine waters of Tarakan, Indonesia. Field observations were conducted from May to August 2025 through 12 standardised gillnet fishing trips. The trips yielded a total catch of 90 individuals representing 15 taxa of fish, crustaceans, and cephalopods. All captured organisms were identified, measured, and weighed. They were classified into main catch, bycatch, and discard categories based on operational and economic relevance. <i>Netuma thalassina</i> constituted the majority of the catch, comprising 66.68 per cent of total biomass and 67.8 per cent of individuals. Bycatch represented 32.85 per cent of biomass and 31.1 per cent of individuals, and included a diverse assemblage of estuarine fishes and crustaceans. Discards were minimal, accounting for only 0.47 per cent of biomass and 1.1 per cent of individuals. These findings demonstrate that the current gillnet configuration effectively targets <i>N. thalassina</i> while maintaining low discard levels in the Tarakan estuarine fishery. This study establishes a gear-based baseline that explicitly links gillnet selectivity with catch category structure for <i>N. thalassina</i> in a tropical estuarine fishery. The results provide an empirical reference for evaluating catch structure and supporting adaptive ecosystem-based management of small-scale gillnet fisheries in tropical estuarine systems.</p>

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Gillnet Catch Composition and Selectivity for Giant Sea Catfish Netuma thalassina in a Tropical Estuarine Fishery of Tarakan Waters, Indonesia

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Gazali Salim,
  • Mujiyanto Mujiyanto,
  • Christine Dyta Nugraeni,
  • Muhammad Gandri Haryono,
  • Hairudin Hairudin,
  • Masnia Masnia,
  • Fani Lestari,
  • Agus Indarjo,
  • Sitti Hartinah,
  • Yayuk Sugianti

摘要

Estuarine gillnet fisheries play a critical role in supporting small-scale livelihoods. However, information on gear selectivity and catch category structure remains limited in tropical systems. This study assessed the catch composition and selectivity of gillnet fisheries targeting the giant sea catfish Netuma thalassina in the estuarine waters of Tarakan, Indonesia. Field observations were conducted from May to August 2025 through 12 standardised gillnet fishing trips. The trips yielded a total catch of 90 individuals representing 15 taxa of fish, crustaceans, and cephalopods. All captured organisms were identified, measured, and weighed. They were classified into main catch, bycatch, and discard categories based on operational and economic relevance. Netuma thalassina constituted the majority of the catch, comprising 66.68 per cent of total biomass and 67.8 per cent of individuals. Bycatch represented 32.85 per cent of biomass and 31.1 per cent of individuals, and included a diverse assemblage of estuarine fishes and crustaceans. Discards were minimal, accounting for only 0.47 per cent of biomass and 1.1 per cent of individuals. These findings demonstrate that the current gillnet configuration effectively targets N. thalassina while maintaining low discard levels in the Tarakan estuarine fishery. This study establishes a gear-based baseline that explicitly links gillnet selectivity with catch category structure for N. thalassina in a tropical estuarine fishery. The results provide an empirical reference for evaluating catch structure and supporting adaptive ecosystem-based management of small-scale gillnet fisheries in tropical estuarine systems.