동해 강원도 연안 임연수어, Pleurogrammus azonus 의 연령과 성장
Age and growth of the Okhotsk atka mackerel, Pleurogrammus azonus in the coastal of Gangwon-do, East Sea
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본 연구는 강원도 동해 연안에서 자망과 정치망에 주로 어획되는 임연수어의 연령과 성장특성을 구명하기 위하여 2008년 1월부터 12월까지 매월 시료를 채집하여 조사를 수행하였다. 산란특성을 구명하기 위하여 생식소숙도지수의 변화를 관찰한 결과 9월부터 점차 증가하기 시작하여 11-12월에 가장 높은 값을 보였으며, 1월이 되면서 가장 낮은 값을 나타내어 주 산란기는 11-12월로 추정된다. 윤문의 형성시기 및 연간 형성횟수를 파악하기 위해 월별 연변부연혁지수의 변화를 분석한 결과 윤문은 12월과 1월 사이에 일년에 한번 형성되는 것으로 나타났다. 임연수어의 가랑이체장에 대한 중량증가의 경향을 보기 위해 전장과 중량간의 상대대성장식을 분석한 결과, 암컷은 BW=0.005FL3.240 (R2=0.963), 수컷은 BW=0.006FL3.238 (R2=0.946)로 나타났다. 이석반경과 가랑이체장간의 관계식으로부터 역계산된 연령별 가랑이체장을 이용하여 성장 매개변수값을 분석하고, 이를 바탕으로 임연수어의 von Bertalanffy 성장식을 추정한 결과 암컷은 FLt=70.54 (1 – exp(-0.099(t+1.188))), 수컷은 FLt=51.87 (1 – exp(-0.135(t+1.697)))였다. 성장식을 바탕으로 임연수어의 성장특성을 분석한 결과, 임연수어는 3세 이하의 개체에서는 수컷의 성장이 빠르고, 4세 이상의 고연령이 되면서 암컷의 성장이 빠른 것으로 나타났다. 앞으로 임연수어의 자원관리를 위해서는 수온변화에 따른 초기생활사 연구와 섭식, 산란, 회유 등의 생태적 연구가 지속적으로 진행되어야 할 것으로 판단된다.
Abstract
The age and growth of Pleurogrammus azonus in the coastal of Gangwon-do, East Sea were determined, from monthly samples of commercial catches, caught by the gill net and set net fishery from January to December in 2008. Gonadosomatic index (GSI) began to increase in September, and reached the maximum between November and December. After spawning GSI began to decrease from January. The annuli of P. azonus are formed once a year, with the boundary between opaque and translucent zones forming from December to January. The relationships between fork length (FL) and body weight (BW) were BW = 0.005 FL3.240(R2 = 0.963) for females and BW = 0.006 FL3.238(R2 = 0.946) for males. The FLs at annuli formation in otoliths were back-calculated from the otolith-length relationship and were adjusted to von Bertalanffy growth curves to FLt = 70.54 (1–exp(-0.099(t+1.188))) for females and FLt = 51.87 (1–exp(-0.135(t+1.697))) for males. Until the age of 3 years, males grew faster than females; however, from the age of 4 years, females grew faster than males. In the future, we want to study the relationship between early growth and water temperature changes in the East Sea
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