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Reproductive Biology of Common Octopus, Octopus vulgaris in the South Sea of Korea

Yeonghye Kim, Hyunjung Kang, Eunhui Lee, Dongwoo Lee, Daesoo Chang and Woo-Seok Gwak

Fisheries Resource Research Department, National Fisheries Research and Development Institute Busan, 619-705, Korea

Samples were collected monthly from coastal water around Tongyeong and Sacheon in Gyeongsangnam-do,Korea, using traps. A total of 748 Octopus vulgaris were sampled from February 2007 to January 2008. Monthlychanges of maturity stages and sex ratio of the common octopus were observed. Mean biomass (total wet weight)of the female specimens ranged from 129.8 to 3,381.4 g and that of the male specimens ranged from 128.6 and2,378.4 g. The spawning periods were May to June and September. The fecundity ranged from 5,715 eggs at252.0 g to 240,990 eggs at 3,381.4 g of total wet weight. The relationship between total wet weight (TW) andfecundity (F) was F = 26.539 TW1.1548 (r2 = 0.8199) and fecundity increased with total wet weight. Sex ratio was notsignificantly different from the 1:1 (p > 0.05).

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