채낚기어업에서의 해양환경 및 자원 변동에 따른 살오징어(Todarodes pacificus)의 생물학적 특성의 장기변동 연구
Long-term Changes in Biological Characteristics of Common Squid Todarodes pacificus in Response to Environmental and Stock Variability in the Korean Jigging Fishery
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초록
This study classified the resource status of common squid Todarodes pacificus caught by the Korean jigging fishery between 1994 and 2023 into three periods based on the standardized catch per unit effort (CPUE): high-resource (1994–2002), resource-declining (2003–2016), and low-resource (2017–2023) periods. Biological characteristics for each period were compared and analyzed in relation to the environmental changes. Biological analyses included mantle length-body weight relationship, mantle length frequency distribution, gonadosomatic index (GSI), length at maturity, and condition factor (K). Environmental variables included sea surface temperature (SST) and zooplankton biomass. The environmental analysis revealed a delay in the timing of southward migration to suitable thermal ranges and an increase in zooplankton biomass. The biological analyses indicated that average mantle length and length at maturity (L50 and L95) continuously decreased, whereas body condition showed an increasing trend. These changes in biological characteristics suggest that resource variability and environmental fluctuations influence resource status.
Abstract
This study classified the resource status of common squid Todarodes pacificus caught by the Korean jigging fishery between 1994 and 2023 into three periods based on the standardized catch per unit effort (CPUE): high-resource (1994–2002), resource-declining (2003–2016), and low-resource (2017–2023) periods. Biological characteristics for each period were compared and analyzed in relation to the environmental changes. Biological analyses included mantle length-body weight relationship, mantle length frequency distribution, gonadosomatic index (GSI), length at maturity, and condition factor (K). Environmental variables included sea surface temperature (SST) and zooplankton biomass. The environmental analysis revealed a delay in the timing of southward migration to suitable thermal ranges and an increase in zooplankton biomass. The biological analyses indicated that average mantle length and length at maturity (L50 and L95) continuously decreased, whereas body condition showed an increasing trend. These changes in biological characteristics suggest that resource variability and environmental fluctuations influence resource status.