Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Fluctuations of Common Squid Todarodes pacificus Catches in the Northwestern Pacific under Changing Climate and Habitat Temperature

기후변화와 서식지 수온 변화에 따른 북서태평양 살오징어(Todarodes pacificus)의 어획량 변동

  • Song, Hyejin (Institute of Geomatics, Pukyong National University)
  • 송혜진 (부경대학교 지오메틱연구소)
  • Received : 2018.06.05
  • Accepted : 2018.06.22
  • Published : 2018.06.30
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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.

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References

  1. Bower JR and Sakurai Y. 1996. Laboratory observations on Todarodes pacificus (Cephalopoda: Ommastrephidae) egg masses. Amer Mal Bull 13, 65-71.
  2. Bower JR. 1997. A biological study of egg masses and paralarvae of the squid Todarodes pacificus. Ph.D. Dissertation, Hokkaido University, Hakodate, Japan.
  3. Boyle PR. 1987. Cephalopod life cycles: Volume II: Comparative Reviews. Academic Press, London, UK, 5-31.
  4. Kidokoro H, Goto T, Nagasawa T, Nishida H, Akamine T and Sakurai Y. 2010. Impact of a climate regime shift on the migration of Japanese common squid (Todarodes pacificus) in the Sea of Japan. ICES J Mar Sci 67, 1314-1322. https://doi.org/10.1093/icesjms/fsq043.
  5. Kim K, Kim KR, Min DH, Volkov Y, Yoon JH and Takematsu M. 2001. Warming and structural changes in the East (Japan) Sea: a clue to future changes in global oceans?. Geo Res Let 28, 3293-3296. https://doi.org/10.1029/2001GL013078.
  6. Lee J, Ryu J and Kee H. 2017. A Study on the Status of Chinese Fishing in the East Sea off North Korea and Directions for Countermeasues. J Fish Bus Adm 48, 61-74. http://dx.doi.org/10.12939/FBA.2017.48.3.061.
  7. Lipinski MR, Durholtz MD and Underhill LG. 1998. Field validation of age readings from the statoliths of chokka squid (Loligo vulgaris reynaudii d'Orbigny, 1845) and an assessment of associated errors. ICES J Mar Sci 55, 240-257. https://doi.org/10.1006/jmsc.1997.0274.
  8. Lluch-Belda D, Lluch-Cota DB, Hernandez-Vazquez and Salinas-Zavala CA. 1992. Sardine population expansion in eastern boundary systems of the Pacific Ocean as related to sea surface temperature. S Afr J mar Sci 12, 147-155. https://doi.org/10.2989/02577619209504698.
  9. Nakamura Y and Sakurai Y. 1993. Age determination from daily growth increments in statoliths of some groups of Japanese common squid, Todarodes pacificus. In: Recent Advances in Cephalopod Fisheries Biology, T Okutani, RK O'Dor and T Kubodera, eds. Tokai University Press, Tokyo, Japan, 339-344.
  10. Okutani T 1983. Todarodes pacificus. In: Cephalopod life cycles: volume I: Species Accounts. Boyle PR, ed. Academic press, London, UK, 201-214.
  11. Puneeta P, Vijai D, Yoo HK, Matsui H and Sakurai Y. 2015. Observations on the spawning behavior, egg masses and paralarval development of the ommastrephid squid Todarodes pacificus in a laboratory mesocosm. J Exp Bio 218, 3825-3835. http://doi:10.1242/jeb.127670.
  12. Rodionov SN. 2004. A sequential algorithm for testing climate regime shifts. Geo Res Let 31. L09204. https://doi.org/10.1029/2004GL019448.
  13. Sakurai Y, Bower JR, Nakamura Y and Yamamoto S and Watanabe K. 1996. Effects of temperature on development and survival of Todarodes pacificus embryos and paralarvae. Amer Mal Bull 13, 89-95.
  14. Sakurai Y, Kiyofuji H, Saitoh S, Goto T and Hiyama Y. 2000. Changes in inferred spawning areas of Todarodes pacificus (Cephalopoda: Ommastrephidae) due to changing environmental conditions. ICES J Mar Sci 57, 24-30. https://doi.org/10.1006/jmsc.2000.0667.
  15. Sakurai Y, Kiyofuji H, Saitoh SI, Yamamoto J, Goto T, Mori K and Kinoshita T. 2002. Stock fluctuations of the Japanese common squid, Todarodes pacificus, related to recent climate changes. Fish sci 68, 226-229. https://doi.org/10.2331/fishsci.68.sup1_226.
  16. Song H. 2012. Studies on growth and reproduction of the Japanese common squid, Todarodes pacificus (Cephalopoda: Ommastrephidae). Ph.D. Dissertation, Hokkaido University, Hakodate, Japan.
  17. Tian Y, Kidokoro H, Watanabe T and Iguchi N. 2008. The late 1980s regime shift in the ecosystem of Tsushima warm current in the Japan/East Sea: evidence from historical data and possible mechanisms. Prog Oceanogr 77, 127-145. https://doi.org/10.1016/j.pocean.2008.03.007.