Characteristic of eddies kinetic energy associated with yellowfin tuna in southern Java Indian Ocean

Abstract

Eddies kinetic energy (EKE) is one of the most indicators in observed the phenomena of upwelling and down welling generated by circular current or eddies. This research aims are to determine the characteristics and intensity of eddies and EKE and its relation to the distribution of yellowfin tuna (Thunnus albacares) in Southern Java Indian Ocean. Based on Automated Eddies Detection (AED) method, it is succesfully discovered many eddies well formed in Southern Java Indian Ocean through 2014. Furthermore, EKE has a vary values to the depth, which tends to be higher at the surface layer than at thermocline layer. EKE in this region display a distinct seasonal cycle with maximum occurred in Southeast Monsoon and minimum in Northwest Monsoon. Increasing of EKE in Southeast Monsoon tend to be affected by currents system of Indonesian Throughflow (ITF) and South Equatorial Current (SEC). The highest of yellowfin tuna catches found in June 2014 and occurred in the current system with high EKE intensity. Correlation between eddies and yellowfin tuna found at thermocline layer (109 m) and occurred in cyclonic eddies (R2 = 0.59).