해양환경안전학회지 (Journal of the Korean Society of Marine Environment & Safety)

  • 제22권1호
  • /
  • Pages.11-19
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  • 2016
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  • 1229-3431(pISSN)
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  • 2287-3341(eISSN)
해양환경안전학회 (The Korean Society of Marine Environment and safety)
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2013-2014년 한국주변해역 수온과 살오징어 유생분포

Distribution of Water Temperature and Common Squid Todarodes pacificus Paralavae around Korean Waters in 2013, 2014

  • Kim, Yoon-Ha (National Institute of Fisheries Research) ;
  • Lee, Chung Il (Department of Marine Bioscience, Gangneung-Wonju National University)
  • 투고 : 2016.01.12
  • 심사 : 2016.02.25
  • 발행 : 2016.02.28
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초록

한국 주변 해역에서 수온과 살오징어 유생 분포와의 관계를 파악하기 위해 서해 중부(2013년 8월), 동중국해 북부(2013년 8월), 동해 남부연안(2013년 6월, 11월, 2014년 4월, 5월, 6월, 8월, 9월) 등 3개 해역에서 유생 채집과 CTD 조사를 하였다. 유생 채집은 망구 직경 60 cm, 망목 $333{\mu}m$의 Bongo net를 조사선 속도 2-3 knot에 맞춰 저층 부근에서 표층까지 경사채집(oblique tow) 하였다. 서해 중부에서는 오징어 유생이 발견되지 않았으며, 동중국해 북부에서는 외투장 1.0 mm의 1 개체가 발견되었다. 동해에서는 총 39 개체의 유생이 발견되었으며, 외투장 범위는 1.9-13.5 mm이다. 2013년 8월 서해 중부의 표층 수온은 약 $30^{\circ}C$인 반면 30 m 이하에서는 $10^{\circ}C$ 이하로 낮게 나타나 살오징어 유생의 생존에 적합한 수온($15-24^{\circ}C$)의 공간적 분포가 좁았다. 동중국해 북부의 표층 수온은 $31^{\circ}C$에 이르는 고온이며, 50 m 이하 수심에서도 $20^{\circ}C$ 이상의 수온이 분포하여 비교적 깊은 수심에 유생이 분포하는 것으로 추정되었다. 동해 남부 연안에서는 관측기간 동안 유생의 생존에 적합한 수온이 75 m보다 얕았다.

Field observation for oceanic conditions and paralarvae of the common squid, Todarodes pacificus in Korean waters were sampled with the Bongo net (diameter: 60 cm, mesh size: $333{\mu}m$) by using oblique tow method with the oceanographic research vessel (Tamgu 12 and Tamgu 20) around Korean waters (middle of the Yellow Sea, northern part of the East China Sea, East Sea) in 2013 and 2014 was carried out. The observation in the Yellow Sea and the northern part of the East China Sea was done in August, 2013 and in the East Sea it was repeated at seven times from June, 2013 to September, 2014. The paralarvae in August of 2013 was not found in the Yellow Sea and one paralarvae was found in the northern part of the East China Sea. In the East Sea, 39 paralarvae during whole observation period were found, mantle length of paralarvae was from 1.7 to 13.5 mm. Surface water temperature in the Yellow Sea was $30^{\circ}C$, and cold water mass lower than $10^{\circ}C$ was occupied in the deep layer than 30 m. In the northern part of the East China Sea, surface water temperature was $31^{\circ}C$, and higher water temperature above $20^{\circ}C$ was found in deeper than 50 m. In the East Sea, optimum temperature for survival, $15-24^{\circ}C$, was existed shallower than 75 m.

키워드

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