The application of remote sensing data on Yellowfin tuna (Thunnus albacares) catchment area related to ENSO-IOD events in Eastern Indian Ocean - Off Coast Java ZD Istnaeni (a*), R Hidayat (b), M Zainuddin (b), JL Gaol (a), D Fitrianah (c)
(a) IPB University, Jl. Raya Dramaga, Bogor, West Java, Indonesia 16680
*dindazabhika[at]gmail.com
(b) Hasanuddin University, Jl. Perintis Kemerdekaan Km 10, Makassar, South Sulawesi,
Indonesia 90245
(c) Bina Nusantara University, Jl. Kebon Jeruk Raya 27, Jakarta, Indonesia 11530
Abstract
The eastern Indian Ocean (EIO) is influenced by two climate phenomena, the Indian Ocean Dipole (IOD) and the El-Nino Southern Oscillation (ENSO), affecting 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 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 EIO, performed by Generalized Additive Model (GAM). Furthermore, the Dipole Model Index (DMI) and Nino 3.4 were used to measure the climate. The results showed that the combination of SST and SSC had the best performance with an AIC of 1175.004, with SSC becoming the most influential factor with a p-value of 0.0037. Yellowfin tuna tended to prefer the SST with a range of 28-29 C and SSC of 0.13-0.17 ml/m3. In the peak season of 2009, a negative dipole mode of -0.115 occurred with a positive NINO of 0.06, while in 2010, a positive dipole mode of 0.38 occurred with a negative NINO of -0.22. The fishing grounds were also influenced by various events such as fronts and eddies that formed ideal characteristics.
Keywords: Eastern Indian Ocean- ENSO-IOD- Fishing Ground- GAM
Topic: Marine and Fisheries Geographic Information System
