Sensitivity and Dynamic of Sardinella Lemuru in Bali Strait Indonesia

Abu Bakar Sambah, Adi Wijaya, Nurin Hidayati, Feni Iranawati


The study of the oceanographic parameters related to the fish habitat is important in predicting the fishing season dynamics for sustainable fisheries management. The characterization of Sardinella lemuru was analyzed to study the sensitivity and dynamic of S. lemuru to the oceanographic factors in the Bali Strait, Indonesia. The study aims to analyze the sensitivity and fishing season dynamic of S. lemuru to the oceanographic factors, ENSO, and IOD in the Bali Strait, Indonesia. Dataset was obtained from the MODIS Aqua/Terra satellite images for 2000-2020, S. lemuru catch from the fishing logbook, and fishing ground point data. They were analyzed using the GAM approach for the habitat suitability model prediction of S. lemuru. The study described that the Fishing Season Index (FSI) was increased and followed by the decrease of SST (the highest value of SST was in December, and the lowest was in September). The increase of SSC was influenced by the El-Nino phenomena and followed by the increasing number of FSI. The SST and SSC have an inverse pattern. The upwelling phenomenon causes a decrease in SST and high nutrient content in the water surface. GAM analysis illustrated three alternative models for the habitat prediction with oceanographic parameters as predictors, in which the combinations of SST and SSC in the model described the best model. Habitat suitability prediction of S. Lemuru generated from the spatial data overlay process based on the GAM analysis value was described monthly potential fishing ground of S. lemuru. The potential fishing ground described that during the end of the transition season-2 to the west season indicated as suitable habitat mostly in the study area. This study made important contributions for sustainable lemuru fish management in the Bali Strait, especially in support of the regulation of fishing activities based on seasons or based on catch quotas and fishing ground.



Keywords: Sardinella lemuru, oceanographic parameters, habitat mapping, fishing ground.


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