제주해역 참문어(Octopus vulgaris)의 어획실태와 생식생태
Catch and reproductive biology of common octopus Octopus vulgaris in the coastal waters of Jeju Island, Korea
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참고문헌
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초록
제주지역 참문어는 1984년 843톤으로 가장 높은 어획량을 보인 후 감소하고 있으며, 주로 연안어업인 마을어업과 연안복합어업에 의해 어획되었다. 생식소숙도지수에 의한 산란기는 7-8월로 추정되어지며, 산란시기를 지나 발생한 유생은 가을까지 부유유생기를 거쳐 바닥에착저하여 이듬해 1월에 300-600 g까지 성장한 후 5월부터 생식소를 발달시켜 산란 후 9-10월 사이 자연사망하는 생애주기를 가지는 것으로 추정되어진다. 제주에 서식하는 참문어 암컷과 수컷의 50% 성성숙 체중은 554.7 g과 330.6 g으로 성장기간을 고려하면, 참문어의 지속적인 이용을 위한 자원관리는 1-2월부터 시작하는 것이타당하다고 판단된다.
Abstract
The purpose of this study is to provide information about annual variations in catch size and changes in reproductive biology in the common octopus, Octopus vulgaris, a commercially important species in Jeju Island. Samples were collected from coastal waters of Jeju Island, Korea by coastal trap fishery from January to November 2021. Octopus vulgaris have been decreasing in this region since 1984. The mantle length (ML) ranged from 4.5 to 17.8 cm and body weight (BW) ranged form 88.5 to 2,657.5 g. A χ 2 -test revealed that the number of males was significantly greater than females (χ 2 = 32.712, df = 10, P<0.05). Mature females were found from January to July and male occurred January to August. The gonadosomatic index value was higher from July to August than other months. The relationship between mantle length and body weight was BW = 2.4527ML2.3139 (female) and BW = 2.6785ML2.3159 (male). At 50% group maturity, female and male average weight was estimated to be 554.7 g and 330.6 g, respectively.
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