Potential big eye tuna (Thunnus obesus) fishing zone in western Sumatra Sea, Indonesia based on Sub-surface Temperature

Abstract

Tuna is a large pelagic fish that has high economic value, so knowledge of the potential bigeye tuna fishing zone is needed to facilitate fishermen in conducting tuna fishing operations. This study was conducted using bigeye tuna catch logbook data from 2022-2023 obtained from Bungus Fishing Port, Padang, Indonesia. Sub-surface temperature data was obtained from global modeling data conducted by CMEMS at depths of 77m, 100m, and 130m. The results of potential bigeye tuna fishing zones in the Western Waters of Sumatra, Indonesia based on sub-surface temperature using the ECDF method found that in the east season, bigeye tuna has an optimum temperature in the range of 26.9-30OC at 77m depth, while the west season has an optimum temperature in the range of 15.7-27.6OC at 109m depth. The algorithm used in spatial modeling of potential bigeye tuna fishing zones in the east season is y = -0.0134x2 + 0.7688x - 10.968 and the west season is y = -0.0031x2 + 0.1332x - 1.3354.