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수온변동에 따른 아르헨티나 짧은지느러미오징어, Illex argentinus의 풍도 변화

Abundance of Argentine shortfin squid, Illex argentinus(Castellanos) in Relation to Fluctuation of Water Temperature in the Southwestern Atlantic Ocean

  • Kim, Yeong-Seung (National Fisheries Research and Development Institute) ;
  • Kim, Doo-Nam (National Fisheries Research and Development Institute)
  • 발행 : 2004.11.01

초록

아르헨티나 짧은지느러미오징어는 1993년에 99,000톤에서 1994년 56,600톤으로 감소하고 1996년에는 78,600톤에서 1997년 130,300톤으로 다시 증가하였다. 어획량의 급감 및 급증한 1993~1994년과 1996~1997년의 성어기인 3~5월의 풍도 원인을 구명하기 위하여 아르헨티나 짧은지느러미오징어의 수온 변동에 따른 풍도 변화를 분석하였다. 호황을 보였던 해인 1993년과 1997년은 성어기에 주로 50$^{\circ}$~51$^{\circ}$S간 해역에서 주어장이 형성되었고, 불황을 보였던 1994년과 1996년에는 50$^{\circ}$S이북에서 성어기 어장이 형성되었으며 포클랜드 어장의 평균수온은 3월 10~11$^{\circ}$C, 4~5월은 9$^{\circ}$C로 평균 등온선이 형성되는 위치에 따라 어황이 변동하는 것으로 나타났다. 아르헨티나 짧은지느러미오징어의 높은 단위노력 당어획량(kg/line) 및 어획량은 어장이 포클랜드 해류의 영향을 받지 않은 1993년 및 1997년은 호황을 보였고, 북상하는 포클랜드 해류의 영향을 받은 1994년 및 1996년에는 급격히 감소되어 불황을 보였다.

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