The ENSO-IOD effects on Yellowfin tuna (Thunnus albacares) in Eastern Indian Ocean - Off Coast Java

Abstract

Abstract The eastern Indian Ocean (EIO) is influenced by two climate phenomena, the Indian Ocean Dipole (IOD) and the El-Niño Southern Oscillation (ENSO), which affect the presence and abundance of yellowfin tuna (Thunnus albacares). Monthly satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua L3 of sea surface temperature (SST) and sea surface chlorophyll-a (SSC), along with the yellowfin longline catch data, were used to investigate the oceanographic conditions and their impact on yellowfin tuna catch in the EIO, performed by Generalized Additive Model (GAM). Furthermore, the Dipole Model Index (DMI) and oceanic niño index (ONI) were used to measure the IOD and ENSO indications. The results showed that SST + SSC had the best performance with an AIC of 1095.513, with SST becoming the most influential factor with a p-value of 0.0473. Yellowfin tuna were mainly caught in the SST range of 28-28.5°C and SSC of 0.05-0.10 ml/m 3 . From 2009 to 2010, moderate El Niño, moderate El Nina, and weak positive IOD occurred in the study area, and the yellowfin hook rates declined when the IOD was positive with El Niño.

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