Exploring the Stock Status of Big Eye Scad (Selar crumenopthalmus Bloch, 1793) Fishery after A Lobster Stock Decline in Gunungkidul Waters: A Length-Based Approach

• T. Tirtadanu ^[1] ; Andina Ramadhani Putri Pane ^[1] ; Duranta D. kembaren ^[1] ; Siti Mardlijah ^[1] ; Moh Fauzi ^[1] ; Khairul Amri ^[1] ; Heri Widiyastuti ^[1] ; Farouq Heidar Barido ^[2]
  1. [1] Research Center for Fishery, National Research and Innovation Agency (BRIN), Bogor
  2. [2] Universitas Sebelas Maret
• Localización: Thalassas: An international journal of marine sciences, ISSN 0212-5919, Vol. 41, Nº. 3, 2025
• Idioma: inglés
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• Resumen

  • Declining lobster catches in Gunungkidul waters have led to a gear shift from lobster traps to surface gillnet fisheries targeting small pelagic. These conditions have led to an increase in fishing pressure on big eye scad (Selar crumenopthalmus). Therefore, research related to stock status is crucial to prevent population decline that results in economic losses. This study examined the population characteristics and stock status of S. crumenopthalmus in Gunungkidul waters. Population characteristics and stock status were assessed using a length-based approach with samples collected from March to October 2023. The sample size was 912 fish. The length-frequency distribution ranged from 15 to 27 cm, with a class interval of 1 cm. Variations in mortality parameters were used to determine the uncertainty of exploitation rates and spawning potential ratio. The results showed that most of S. crumenopthalmus caught by gillnet was relatively small, below its optimal size, and had negative allometry growth, with a coefficient of b 2.86. The stock status of big eye scad fishery is also overfished based on the length-converted catch curve analysis with an exploitation rate (E) of 0.65 ± 0.09. The percentage of spawning stock biomass (SSB) which was below 40% (32 ± 9%) further reinforces this evidence. A reduction in fishing efforts (e.g. limiting fishing trips, mesh size increase) driven by local wisdom is needed for the economic sustainability of big eye scad fishery in Gunungkidul waters