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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39406

Title: Environmental effects on yellowfin tuna catch by the Taiwan longline fishery in the Arabian Sea
Authors: Kuo-Wei Lan;Ming-An Lee;Tom Nishida;Hsueh-Jung Lu;Jinn-Shing Weng;Yi Chang
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Date: 2012-07
Issue Date: 2016-12-09T08:08:33Z
Publisher: International Journal of Remote Sensing
Abstract: Abstract:In this study, we collected environmental variables to investigate their effects on the catch per unit effort (CPUE) of yellowfin tuna in the Arabian Sea during the period 1980–2005. We used an advanced time series analysis, including a state-space approach to remove seasonality, and wavelet analysis to investigate transient relationships. For large-scale environmental effects, we used the dipole mode index (DMI) to represent the Indian Ocean dipole; for local environmental factors, we investigated sea surface temperature (SST), thermocline depth and chlorophyll-a (chl-a) concentration. The main factors causing interannual variations in the CPUE might change with time. CPUE showed positive correlations with SST and DMI from the beginning of the 1980s to the middle of the 1990s. It also showed a significant coherence with chl-a, especially a long-term positive correlation for the regular longline fishery in 1998–2005 with a periodicity of 2 years. Both regular and deep longline CPUEs were found to have significant coherence with thermocline depth having a periodicity of 3 years. The relations were of opposite signs such that the shallow thermocline depth produced a high CPUE for the regular longline fishery and deep thermocline depth caused a high CPUE for the deep longline fishery.
Relation: 33, pp.7491-7506
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39406
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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