Detection of Potential Fishing Zones of Bigeye Tuna (Thunnus Obesus) at Profundity of 155 m in the Eastern Indian Ocean

• Main Authors: Achmad Fachruddin-Syah, Jonson Lumban Gaol, Mukti Zainuddin, Nadela Rista Apriliya, Dessy Berlianty, Dendy Mahabror
• Format: Article
• Language: English
• Published: Universitas Gadjah Mada 2020-04-01
• Series: Indonesian Journal of Geography
• Subjects: bigeye tuna; profundity of 155 m; eastern indian ocean; maximum entropy model; potential fishing zone
• Online Access: https://jurnal.ugm.ac.id/ijg/article/view/43708
• ISSN: 0024-9521; 2354-9114

Remotely sensed data and habitat model approach were employed to evaluate the present of oceanographic aspect in the Bigeye tuna's potential fishing zone (PFZ) at a profundity of 155 m. Vessel monitoring system was employed to acquire the angling vessels for Bigeye tuna from January through December, 2015-2016. Daily data of sub-surface temperature (Sub_ST), sub-surface chlorophyll-a (Sub_SC), and sub-surface salinity (Sub_SS) were downloaded from INDESO Project website. Vessel monitoring system and environmental data were employed for maximum entropy (maxent) model development. The model predictive achievement was then estimated applying the area under the curve (AUC) value. Maxent model results (AUC>0.745) exhibited its probable to understand the Bigeye tuna's spatial dispersion on the specific sub-surface. In addition, the results also showed Sub_ST (43,1%) was the most affective aspect in the Bigeye tuna dispersion, pursued by Sub_SC (35,2%) and Sub_SS (21,6%).