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2014•Unpublished venueRequires access

CPUE standardization of albacore tuna caught by Korean tuna longline fishery in the Indian Ocean

Sung Il Lee, Zang Geun Kim, Mi Kyung Lee, Jeong Eun Ku, Dong Woo Lee

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Abstract

In this study, CPUE (catch per unit effort) standardization for albacore tuna of Korean longline fishery in the Indian Ocean was conducted by Generalized Linear Model (GLM) using operational (set by set) data to assess the proxy of the abundance index. The data used for GLM were catch (in number), effort (number of hooks) and number of hooks between floats (HBF) by year, month and area. Albacore tuna CPUE by Korean tuna longline fishery was standardized for the whole area and for the core area. The standardized CPUE had had a stable trend at low level until 2006 and all of CPUEs started to increase in 2007, since then, however, those show different trends among each model.

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What this paper is about

In this study, CPUE (catch per unit effort) standardization for albacore tuna of Korean longline fishery in the Indian Ocean was conducted by Generalized Linear Model (GLM) using operational (set by set) data to assess the proxy of the abundance index. The data used for GLM were catch (in number), effort (number of hooks) and number of hooks between floats (HBF) by year, month and area. Albacore tuna CPUE by Korean tuna longline fishery was standardized for the whole area and for the core area. The standardized CPUE had had a stable trend at low level until 2006 and all of CPUEs started to increase in 2007, since then, however, those show different trends among each model.

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Available abstract

In this study, CPUE (catch per unit effort) standardization for albacore tuna of Korean longline fishery in the Indian Ocean was conducted by Generalized Linear Model (GLM) using operational (set by set) data to assess the proxy of the abundance index. The data used for GLM were catch (in number), effort (number of hooks) and number of hooks between floats (HBF) by year, month and area. Albacore tuna CPUE by Korean tuna longline fishery was standardized for the whole area and for the core area. The standardized CPUE had had a stable trend at low level until 2006 and all of CPUEs started to increase in 2007, since then, however, those show different trends among each model.

Key concepts: Albacore, Tuna, Fishery, Catch per unit effort, Thunnus, Skipjack tuna, Environmental science, Geography

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