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http://dx.doi.org/10.5657/KFAS.2018.0338

Fluctuations of Common Squid Todarodes pacificus Catches in the Northwestern Pacific under Changing Climate and Habitat Temperature  

Song, Hyejin (Institute of Geomatics, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.51, no.3, 2018 , pp. 338-343 More about this Journal
Abstract
Recently, commercial catches of the common squid Todarodes pacificus have dramatically decreased in Korean and Japanese waters. The relationship between common squid catches and environmental factors was investigated using squid catches, climate indices and observed seawater temperatures in Korean waters. Common squid consist of three spawning stocks: autumn, winter, and summer. The autumn stock is the largest in Korea, and its main fishing season appears to have shifted from September in the 1980s to October in the 1990s. We observed negative correlations between the spring Southern Oscillation Index and Korean catches and between the winter Pacific Decadal Oscillation and Japanese catches. Despite global warming, no conspicuous increases in October seawater temperatures have been observed at 10 and 50 m in Korean waters since the mid-1900s. Instead, the 50 m water layer of the East Sea appears to be gradually cooling. Moreover, temperatures at 50 m in the East Sea and the South Sea were significantly negatively correlated with squid catches in Korea and Japan, respectively. Our preliminary analysis indicates a link between climate change, seawater temperature, and squid catches in Korean waters, which helps to inform the direction of subsequent research to identify the cause of rapid decreases in this squid resource.
Keywords
Todarodes pacificus; Common squid; Climate change; Optimal temperature; East Sea;
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Times Cited By KSCI : 1  (Citation Analysis)
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