Abstract

This study was executed to obtain information on the sex ratio, sexual group maturity, fecundity and main spawning period necessary in the management of the fisheries resources of Octopus minor in Korea. The sex ratio (female:male) of O. minor was 1:1.15 (female 46.4%) illustrating higher ratio of male. The mantle length of 50% sexual group maturity by using logistics model was analyzed to be 3.6 cm and 5.6 cm for female and male, respectively. The absolute fecundity was analyzed to be average 124.4 per individual. The relative fecundity was analyzed to be 14.2 for 1 cm in mantle length and 0.9 for 1 g in total weight. The gonadsomatic index (GSI) was the highest in April (7.80) and October (2.17) for female and male, respectively. The gonad displayed seasonal histological changes, and the main spawning period of O. minor was April-May.