Abstract
First, we analysed alabcore catch data based on time, positions, and layer alabcore caught and ROMS result data monthly climatology data for temperature, salinity. current velocity, and sea surface height for 2005–2008. Then, we analyzed the relationship between catch data and ROMS data by combining the statistical method of regression trogh origin (RTO) and geographic information system (GIS). Three model RTO were generated with the abundance of albacore tuna as a response variable, and temperature, salinity. current velocity, and sea surface height as predictor variables. All of the predictors of temperature, salinity. current velocity, and sea surface height were highly significant (P < 0.001) to the number of albacore tuna. Values of temperature, salinity. current velocity, and sea surface height in albacore tuna preferences ranged from 220 to 230 C, 34.79 to 34.84 Psu, 0.01 to 0.03 m/s and 0.66 to 0.70 m, respectively. Validation of the predicted number ofalbacore tuna with the observed value was significant (P < 0.05, r2 = 0.60). sea surface height was the most important environmental variable to the number of albacore tuna caught, followed by temperature, salinity and current velocity.
Highlights
Albacore (Thunnus alalunga; hereafter ALB) is one of the main target species of the commercial tuna fishery and has a long history of scientific research (Chen et al, 2005)
Albacore tuna has a long history of scientific research and remains the preeminent target species of the commercial tuna fishery, the related literature in the Indian Ocean is scarce in comparison with other oceanic basins like the Atlantic and Pacific Oceans (Nikolic et al, 2014)
Various variables were analyzed on this research, includes ALB catchment data, in addition oceanographic variables consist of temperature, salinity, current velocity are results from Regional Ocean Modeling System (ROMS) data (1990-2008) is divided into 6 layers except for the sea surface heigth which were analyzed to examine their influences on ALB tuna data
Summary
Albacore (Thunnus alalunga; hereafter ALB) is one of the main target species of the commercial tuna fishery and has a long history of scientific research (Chen et al, 2005). Albacore tuna has a long history of scientific research and remains the preeminent target species of the commercial tuna fishery, the related literature in the Indian Ocean is scarce in comparison with other oceanic basins like the Atlantic and Pacific Oceans (Nikolic et al, 2014). The Indian Ocean is one of the most productive fishing grounds, and has a long history of tuna exploitation, little is known about the oceanographic conditions affecting the distribution and abundance of ALB.
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