<![CDATA[Handline fishing plays a crucial role in tuna capture activities at Bungus Ocean Fishing Port, supporting fisheries production in West Sumatra. However, this fishing method requires further assessment, as the proportion of target catch is only slightly higher than that of bycatch, necessitating an evaluation of both catch composition and fishing power of the vessels involved. This study aimed to examine catch proportion, species diversity, and fishing power index of handline fishing vessels operating at Bungus Fishing Port. A survey method was used, comprising direct observations and interviews with fishers at the landing site, from January to February 2026. Collected data were analyzed using catch proportion, Shannon-Wiener diversity index, and Fishing Power Index (FPI) calculations. Results showed that total of 1,523 fishes from 12 species were captured, with yellowfin tuna (Thunnus albacares) as most dominant species (47%), followed by long-fin napper (Macolor niger) (12%), and mahi mahi (Coryphaena hippurus) at about 9%. The higher proportion of main catch indicates that handline fishery operating at this port is relatively effective in catching its intended target. FPI analysis revealed variation in catching ability among vessels, which can serve as a reference for assessing efficiency. Shannon-Wiener diversity index value of H' 1,86 indicated a moderate level of species diversity. Catch variation among vessel units was relatively close to the standard vessel, although continuous monitoring is still required to support sustainable tuna fisheries management. Key words: diversity index, handline, tuna fisheries]]>
