ISSN : 1225-3480
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.
Avila-poveda, O.H., Colin-flores, R.F. and Rosas, C. (2009) Gonad development during the early life of Octopus maya (Mollusca: Cephalopoda). The Biological Bulletin, 216: 94–102.
Boolootian, R.A., Farmanfarmaian, A. and Giese, A.C. (1962) On the reproductive cycle and breeding habits of two western species of Haliotis. The Biological Bulletin, 122: 183-193.
Capinpin, E.C. Jr., Encena Ⅱ, V.C. and Bayona, N.C. (1998) Studies on the reproductive biology of the Donkey’s ear abalone, Haliotis asinina Linne. Research, 29: 989-993.
Cuccu, D., Mereu, M., Porcu, C., Follesa, M.C., Cau, A.L. and Cau, A. (2013) Development of sexual organs and fecundity in Octopus vulgaris Cuvier, 1797 from the Sardinian Waters (Mediterranean Sea). Mediterranean Marine Science, 14: 270-277.
Gosling, E. (2004) Morphology of bivalves. In; Bivalve Molluscs: Biology, Ecology and Culture. (ed. by Gosling, E.). pp. 7-39. Blackwell Publishing Ltd, Oxford.
Head, M.A., Stokes, G.L., Thorson, J.T. and Keller, A.A. (2016) Techniques for improving estimates of maturity ogives in groundfish using double-reads and measurement error models. Fisheries Research, 179:251–258.
Heller, J. (1993) Hermaphroditism in molluscs. Biological Journal of Linnen Society, 48: 19-42.
Jakobsen, T., Fogarty, M.J., Megrey, B.A. and Moksness, E. (2016) Fish reproductive biology: implications for assessment and management. 2nd ediion. Wiley-Blackwell, New Jersey. pp. 473.
Kang, H.J., Kim, Y.H., Kim, S.Y., Lee, D.W., Choi, Y.M., Chang, D.S. and Gwak, W.S. (2009) Maturity and spawning period of the common octopus, Octopus vulgaris in the south sea of Korea. The Korean Journal of Malacology, 25: 127-133.
KHOA (2015) Real time coastal data; Daesan. [Internet]c2015. Korea: Korea Hydrographic and Oceanographic Administration; [cited 2015 May 11]. Available from:http://info.khoa.go.kr
Kim, B.G., Chung, E.Y., Jun, J.C. and Kim, C.H. (2001)Spawning, hatching, survival and cannibalism of Octopus ocellatus. The Korean Journal of Malacology, 17: 85-94.
Kim, D.S. and Kim, J.M. (2006) Embryogenesis in the Octopus minor. Development and Reproduction, 10:135-140.
Kim, D.S. and Kim, J.M. (2006) Sexual maturity and growth characteristics of Octopus minor. Korean Journal of Fisheries and Aquatic Sciences, 39:410-418.
Kim, D.S. and Kim, J.M. (2007) Spawning and hatching of Octopus minor. Korean Journal of Fisheries and Aquatic Sciences, 40: 243-247.
Kim, Y., Kang, H., Lee, E., Lee, D., Chang, D. and Gwak, W.S. (2008) Reproductive biology of common octopus, Octopus vulgaris in the south sea of Korea. The Korean Journal of Malacology, 24: 161-166.
KOSIS (2016) Fishery, species and fishing method statistics [Internet]. c2007/2015. Korea: Korean Statistical Information Service; [cited 2016 Mar 20]. Available from: kosis.kr.
Lee, J.S. and Huh, S.H. (2000) Reproductive biology of the slimy, Leiognathus nuchalis (Teleostei :Leiognathidae). Korean Journal of Ichthyology, 12:192-202.
Lee, J.S., Park, J.J., Shin, Y.K., Kim, H. and Jeon, M.A. (2014) Sex change and sequential hermaphroditism in Tegillarca granosa (Bivalvia: Arcidae). Invertebrate Reproduction & Development, 58: 314-318.
Mackie, G.L. (1984) Bivalves. In: The Mollusca, Vol. 7. Reproduction. (ed. by Wilbur, K.M., Tompa, A.S., Verdonk, N.H. and Vam Den Biggelaar, J.A.M.). pp. 351-418. Academic Press, New York.
NFRDI (National Fisheries Research and Development Institute) (1999) Commercial molluscs from the freshwater and continental shelf in Korea. pp. 197. Gudeok, Busan.
Son, P.W., Kim, B.G. and Kim, S.H. (2015)Gametogenesis, mating behaviour and spawning of Octopus ocellatus (Cephalopoda: Octopodidae) in Western Korea. The Korean Journal of Malacology, 31: 113-121.
Yusa, Y. (2007) Causes of variation in sex ratio and modes of sex determination in the Mollusca – an overview. American Malacological Bulletin, 23: 89-98.
