Catch rates and distribution pattern of the silky shark, Carcharhinus falciformis, caught by the Taiwanese large-scale longline fishery in the Indian Ocean

The silky shark, Carcharhinus falciformis, is widely distributed in tropical and temperate waters, it a common bycatch species for tuna longline fisheries. This study examined the distribution of presents relative abundance indices shark Indian Ocean by using logbook observer data from Taiwanese large-scale fishery between 2005 2019. Due to high zero catch rate, zero-inflated negative binomial (ZINB) model was used standardize per unit effort. lack detailed targeting information, strategy identified cluster analysis based on composition then incorporated as an explanatory variable related target ZINB model. Size segregation observed males females Ocean. Juveniles were mostly concentrated 10° S N. Cluster results revealed five fishing clusters that explained variance models. Our integrated approach improves understanding spatiotemporal dynamics can be derive stock assessment management.