동해안에 서식하는 발문어(Octopus longispadiceus)의 성숙과 산란
Maturity and spawning of Octopus longispadiceus in the East Sea
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우리나라 동해안에 서식하는 발문어에 대한 성숙과 산란을 밝히기 위해 생식소 발달과정, 생식소 숙도지수의 변화, 난경, 포란수, 성숙체장을 분석하였다. 발문어는 매월 완숙개체의 출현과 생식소숙도지수 값이 높게 나타났다. 산란기는 연중산란형으로 추정되며, 봄과 가을에 집중산란하는 것으로 나타났다. 완숙단계의 난경은 19.2±3.0 mm로 나타났고, 포란수는 최소 31개 (BW 189 g)에서 최대 184개 (BW 1,013 g)로 계수되었다. 암컷의 성숙체중 (BW)은 323.4 g (BW50%), 451.4 g (BW75%), 750.3 g (BW97.5%)으로 추정되었다. 발문어의 자원관리는 금어기 및 금지체중 규제보다 어구어법관리를 통한 규제가 효율적인 것으로 판단된다.
Abstract
Maturity and spawning of the Octopus longispadiceus was investigated based on the samples collected in the East Sea. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), eggs diameter, fecundity and body weight at group maturity. Mature stages appeared every month, and GSI values were high every month. Spawning season was estimated to be year-round, and main spawning occurs intensively in sping and fall. The eggs diameter of mature stage was 19.2 ± 3.0 mm. The total number of eggs in the fecundity ranged from 31 eggs in 189 g (BW) to 184 eggs in 1,013 g (BW), which was proportional to body weight (BW), and the relationship between total weight and fecundity was F = 0.7593 × BW0.7719 (R = 0.7462). The percentages of sexually mature females estimated using a logistic equation were 2 over 50% at 323.4 g BW, 75% at 451.4 g BW and 97.5% at 750.3 g BW, respectively. We think that it be good way for Octopus longispadiceus to be regulated by fishing gear and fishing method.