Environmental effects on yellowfin tuna catch by the Taiwan longline fishery in the Arabian Sea

Kuo Wei Lan, Ming An Lee, Tom Nishida, Hsueh Jung Lu, Jinn Shing Weng, Yi Chang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)7491-7506
Number of pages16
JournalInternational Journal of Remote Sensing
Volume33
Issue number23
DOIs
Publication statusPublished - 2012 Dec

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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