POPULATION DYNAMICS OF KAWAKAWA (Euthynnus affinis) LANDED AT PPI UJONG BAROH, WEST ACEH
DOI:
https://doi.org/10.31258/ajoas.8.3.345-355Keywords:
Euthynnus affinis, growth, mortalityAbstract
This study analyzed the population dynamics of kawakawa tuna (Euthynnus affinis) landed at PPI Ujong Baroh, West Aceh, from May to August 2025, using length-frequency data and the Von Bertalanffy growth model. A total of 815 individuals were measured to estimate growth, mortality, and exploitation parameters. The fork length ranged from 22–69 cm, dominated by medium-sized fish (30–37 cm FL), with the length at first capture (Lc = 33 cm FL) notably smaller than the length at first maturity (Lm ≈ 42–43 cm FL). Growth analysis indicated rapid juvenile growth, characterized by an asymptotic length (L∞) of 90 cm and a relatively high growth coefficient (K), while recruitment occurred periodically throughout the year. Mortality estimates showed total mortality (Z) of 4.77/year, natural mortality (M) of 1.45/year, and fishing mortality (F) of 3.32/year, resulting in an exploitation rate (E) of 0.70, which exceeds the optimal reference point (E = 0.5). These findings indicate that the kawakawa tuna stock in West Aceh is currently overexploited. This study provides the first updated, location-specific population parameter estimates for E. affinis in West Aceh waters, offering a critical scientific baseline for regionally adaptive fisheries management. Science-based management measures are therefore recommended, including implementing a minimum landing size of ≥43 cm FL, seasonal closures during spawning periods, effort control, and strengthened fisher participation to ensure long-term stock sustainability
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