Hook size selectivity and management implications for red tilefish (Branchiostegus japonicus) longline fishery in coastal Jeju, Korea

This study evaluates hook-size effects on catch characteristics, maturity composition, selectivity, and management performance for red tilefish (Branchiostegus japonicus) longline fisheries off Jeju Island, Korea, using experimental fishing surveys. Fish length increased proportionally with hook size. Hook 11 (See Figure 3 in Yoon et al., 2026) for hook dimensions) maximized productivity, with the highest mean biomass CPUE, while Hook 14 more successfully balanced conservation (reduced bycatch and fewer immature fish) and productivity.