Abstract
The southern waters off Java-Bali were recognized as spawning and potential fishing ground for tuna species. However, few studies have been conducted on this area. In this paper, the environmental preference of bigeye tuna was assessed based on catch data and three main environmental satellite data; namely; sea surface temperature (SST), sea surface chlorophyll (SSC), and sea surface height deviation (SSHD). Then, the relationship between bigeye tuna catches and environmental satellite data was analyzed by using a simplified method of the Generalized Additive Model (GAM) which is called scatterplot smoothers. This method is the forerunner of GAM and has not yet been applied for fisheries analysis. The aim of this study was to evaluate its performance for/in analyzing bigeye tuna habitat preference. The result indicated that SST, SSC, and SSHD had a high correlation with the bigeye tuna’s spatial patterns. Furthermore, spatial patterns of bigeye tuna preference display typical characteristics of low SST, low SSC, and low positive SSHD as well as areas with extreme SSHD values, which are almost the same results as those identified with GAM analysis in the same study area.
Highlights
The Indian Ocean is the second biggest tuna fishery industry, and it contributes 26% of the world’s catches [1]
The statistical parameter of the Y axis is the conversion of the number of bigeye tuna into log (BE + 1), where bigeye tuna caught (BE) indicates the number of bigeye tuna
The solid line represents the average BE in each span w, the dashed line represents σ2, and the dotted dashed line represents the maximum value in each span
Summary
The Indian Ocean is the second biggest tuna fishery industry, and it contributes 26% of the world’s catches [1]. Bigeye tuna (Thunnus obesus) is one of the tuna species which has high commercial value in the Eastern Indian Ocean [2], and it contributes 24% of the total catches of the four species of tuna in Indonesia [3]. This species displays large longitudinal movement between 40◦ S and 40◦ N, especially in tropical waters [4,5]. The main depth of fishing for bigeye tuna in the Indian Ocean is between 161–280 m [7], they can stay in the surface layer (0–100 m) at night time [4]
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