<![CDATA[Bigeye scad (Selar crumenophthalmus) is an economically important small pelagic fish whose utilization requires local biological information on catch size and gonadal maturity. This study aimed to describe length structure, estimate length at first capture (Lc) and length at 50% maturity (L50/Lm), calculate the Lc/Lm ratio, and describe fishers’ perceptions of size-based management in Sisarahiligamo, Gunungsitoli. Biological data consisted of 200 fish landed during approximately two months, while social data were obtained from 30 fishers using a five-point Likert questionnaire. Fish length was grouped into nine classes. Lc was estimated from cumulative length-frequency data using a logistic approach, whereas L50/Lm was estimated using binary logistic regression after gonadal maturity stages I–II were classified as immature and III–V as mature. Perception data were analyzed descriptively. Fish length ranged from 14.4 to 24.5 cm. Estimated Lc was 20.06 cm and L50/Lm was 19.54 cm, giving an Lc/Lm ratio of 1.03 and a difference of 0.52 cm. The 95% confidence interval for L50 was 19.26–19.82 cm based on 5,000 bootstrap samples; an equivalent confidence interval for Lc was not available. The Lc value being slightly higher than L50/Lm indicates relative concordance between catch size and maturity size, but the margin was narrow. Fishers’ perception scores were 2.26 (low) for juveniles, 2.73 (moderate) for impacts, 3.03 (moderate) for minimum size, and 2.39 (moderate) for knowledge. These results provide local biological and social information to support size-based management, but do not by themselves establish a legal minimum catch size or stock sustainability.]]>
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