ISSN : 1225-3480
북한강에 서식하고 있는 엷은재첩의 산란생태를 파악하기 위하여, 생식소 발달단계에 따른 생식주기, 군성숙도, 난경의 월별변화를 조사하였다. 각장에 대한 각고, 각폭, 전중, 육중간 의 상대성장식에서 상관계수 (<TEX>$R^2$</TEX>) 는 0.921-0.984로 높은 상관관계를 나타내었다. 엷은재첩은 기수재첩 보다는 소형종이었으며, 동시자웅동체로서 체내에서 수정되어 아가미 보육낭에서 부화되어 체외로 방출하는 난태생종이었다. 월별 비만도는 0.14-0.21 범위로 동계인 12월-2월에 낮은 값을 보이다가 2월부터 서서히 높아지기 시작하여 5월에 0.21로 정점을 보였다. 월별 육중량비는 25.9-38.7%로 비만도의 월별 변화와 같은 경향을 나타내었다. 비만도와 육중량비의 정점이 생식세포의 최성숙기와 1-2개월 차이가 있었다. 생식소의 조직상, 비만도 및 생식세포의 월별 변화를 종합하면 북한강산 엷은재첩 생식년주기는 분열증식기(12-2월), 성장기(2-5월), 성숙기(6-8월), 완숙 및 발생기(8-11월), 회복기(11-12월) 로 구분되어 하계산란종이었다. 군성숙 각장은 12.6 mm 였으며, 16 mm 이상의 개체는 모두 성숙하여 아가미에 보육낭을 형성하였다.
북한강에 서식하고 있는 엷은재첩의 산란생태를 파악하기위하여, 생식소 발달단계에 따른 생식주기, 군성숙도, 난경의월별변화를 조사하였다. 각장에 대한 각고, 각폭, 전중, 육중간의 상대성장식에서 상관계수 (R2) 는 0.921-0.984로 높은 상관관계를 나타내었다. 엷은재첩은 기수재첩 보다는 소형종이었으며, 동시자웅동체로서 체내에서 수정되어 아가미 보육낭에서부화되어 체외로 방출하는 난태생종이었다. 월별 비만도는0.14-0.21 범위로 동계인 12월-2월에 낮은 값을 보이다가 2월부터 서서히 높아지기 시작하여 5월에 0.21로 정점을 보였다. 월별 육중량비는 25.9-38.7％로 비만도의 월별 변화와 같은경향을 나타내었다. 비만도와 육중량비의 정점이 생식세포의최성숙기와 1-2개월 차이가 있었다. 생식소의 조직상, 비만도및 생식세포의 월별 변화를 종합하면 북한강산 엷은재첩 생식년주기는 분열증식기(12-2월), 성장기(2-5월), 성숙기(6-8월), 완숙 및 발생기(8-11월), 회복기(11-12월) 로 구분되어 하계산란종이었다. 군성숙 각장은 12.6 mm 였으며, 16 mm 이상의개체는 모두 성숙하여 아가미에 보육낭을 형성하였다
Briton, J.C. and B. Morton. (1986) Polymorphism in Corbicula fluminea (Bivalvia: corbiculacea) from North America. Malacological Review, 19: 1-43.
Boolootian, R.A., Farmanfarmaian, A. and Giese, A.C. (1962) On the reproductive cycle and breeding habits of two western species of Haliotis. Biological bulletin, 122: 183-192
Byun, K.S. and Chung, E.Y. (2001) Distribution and ecology of marsh clam in Gyeongsangbuk-do. Ⅱ. reproductive cycle and larval development of the reproductive cycle and larval development of the Corbicula japonica. Korean Journal of Malacology, 17: 45-55.
Chang, Y,J. and Lee, T.Y. (1982) Gametogenesis and reproductive cycle of the cockel. Fulvia mutica(Reeve). Journal of Korean Fisheries Society, 15: 241-253. [in Korean]
Cho, D.H., O.K. Kwon and S.B. Park. (1983)Eletrophoretic and immunological analyses on the freshwater bivalve (Corbicula). Korean J. of Limnology, 16: 39-41 [in Korean]
Choi, K.H., Chung, E.Y. and Kwak, O.Y. (2007)Karyotype and reproductive characteristics of the diploid brackish water clam, Corbicula japonica and the triploid freshwater marsh clam, C. fluminea. Korean journal of Malacology, 23(1): 39-49. [in Korean]
Chung E.Y., Lee, T.Y. and An, C.M. (1991) Sexual maturation of the venus clam, Cyclina sinensis, on the west coast of Korea. Journal of Medical and Applied Malacologym, 3:125-136.
Chung E.Y., Ryou, D.K. and Lee, J.H. (1994) Gonadal development, age and growth of the shortnecked clam, Ruditapes philippinarum (Pelecypoda:Venerida), on the coast of Kimje, Korea. Korean journal of Malacology, 10: 38-54 [in Korean]
Eversole, A.G. (1997) Gametogenesis of Mercennaria mercennaria, M. cappechiensis and their hybrids. Mautilus, 110: 107-110.
Fretter, V. (1984) Prosobranchs. In: The Mollusca, Vol. 7. (ed. by Tompa, A.S., Verdonk, N.H., and van den Biggelaar, J.A.M.) pp. 1-45. Academic Press, New York.
Fuziwara, T. (1975) on the reproduction of Corbicula leana Prime. Venus, 34(1): 54-56. [in Japanese]
Fuziwara, T. (1978) on the ovulation of Corbicula leana Prime. Venus, [in Japnaese]
Griffiths, R.J. (1997) Reproductive cycle in littoral populations of Chloromytilus meridionalis (Kr.) and Aulocmaya ater (Molina) with a quantitative assessment of gamete production in the former. Journal of Experiment Marine Biology and Ecology, 30: 53-71.
Huh, M.K. (1998) Allozyme variation and population structure of Corbilula papyracea from Nam and Sumjin Rivers. Kor. J. Genetics, 20: 163-172
Jo, M.K., Byun, K.S. and Jang, M.H. (1998) Distribution and ecology of genus Corbicula in the North Kyungsang province. I. Distribution and classification of genus Corbicula in the North Kyungsang province. Journal of Aquaculture, 11: 581-592. [in Korean]
Joh, Y.G., Park, S.J. and Ahn, V.W. (1982) Lipids of fresh-water cockle, Corbicula elatior. Kor. Fish. Soc., 15, 94-98. [in Korean]
Jung. J.Y. (1977) Ecological studies of a brackish water clam, Corbicula japonica PRIME, from Nag Dong river. Nat. Fresh Water Fish Hat. of Fish. Choeng-Pyong, Korea, 2: 130-140. [in Korean]
Kim, J.H. and Yoo. M.S. (2000) Reproductive cycle of marsh clam, Corbicula leana (Prime) in Hyongsan estury. J. Kor. Fish. soc., 33: 184-191. [in Korean]
Kim, W.K., Lee, C.S., Lee, J.Y. Baik, K.K. and Hur, S.B (2002) Environmental factors and population density of brackish water clam, Corbicula japonica on Namdae stream in Yangyang, Gangwon, Journal of Aquaculture, 15: 1-6.
Kim, W.K. Lee, J.Y., An, C.M., Kim, H.S., Choi, C.Y., Kim, J.W., Chung E.Y. and Kim, B.S. (2003)Reproductive cycle and the sex ratio of Corbicula japonica from Namdae stream in Gangwon-do, Korea. Korean Journal of Malacology, 19: 117-124. [in Korean]
Kwon, D.H., Kang, Y.J. and Kim D.H. (2002) Estimation of Growth Parameters of Corbicula (Corbiculina)papyracea Heude from Chungpyeong. J. Korean Fish. Soc. 35(6): 557-562.
Kwon, O.K., Min, D.K. Lee, J.R. Lee, J.S., Je J.G. and Choe, B.L. (2001) Korean Mollusks with color illustration. Min’s shell House, 332pp. [in Korean]
Kwon, O.K., Lee J. S. and Park, G. M. (1987) the studies on the mollusks in the lake Ulam(7). Kor. J. Limn., 20(1): 30-38. [in Korean]
Kwon, O.K., Park, K.M. and Lee, J.S. (1993) Coloured shells of Korea. 371 pp. Academy Publishing Co., Seoul. [in Korean]
Lee, J.H. (1997) studies on the gonadal development and gametogenesis of the granulated ark, Tegillarca garnosa (Linne). Korean Journal of Malacology, 13:55-64.
Lee, J.S. and Kim. J.B. (1997) Systematic study on the genus Corbicula (Bivalvia: Corbiculidae) in Korea. Koreans Journal of Systematics Zoology, 13: 233-246. [in Korean]
Lee, J.Y., chang, Y.J. and lee, C.S. (1997) Reproductive cycle of surf clam, Spisula sachalinensis. Journal of Korean Fisheries Society, 30: 132-138. [in Korean]
Lee, S.J., Min, K.S., Kim, B.G., An, C.M., Ju, S.M. and Lee, J.S. (2006) Gonadal development and gametogenic cycle of the pen shell, Atrina pectinata (Bivalvia: Pinnidae). Journal of Korean Fisheries socity, 39: 398-403. [in Korean]
Mann, R. (1979) Some biochemical and physiological aspects of growth and gametogenesis in Crassostrea gigas and Ostrea edulis grown at sustained elevated temperatures. Journal of marine Biological association of U.K., 59: 95-110.
Maru, K. (1976) Studies on the reproduction of a scallop, Patinopecten yssoensis (Jay) - 1. Reproductive cycle of the cultured scallop. Science Reports hokkaida Fishery Experiment Station, 18: 9-26.
Morton, B., 1987. Polymorphism in Corbicula fluminea (Bivalvia: Corbiculacea) from Hong Kona. Malacological Review, 20: 105-127.
Okamoto, A. and B. Arimoto, 1986. Chromosomes of Corbicula japonica, C. sandai and C. (Corbiculina)leana (Bivalvia: Corbiculidae). Venus, 12(3-4):150-158. [in Japanese]
Park, G.M., Lee, J.S. Song, H.B. Park, J.C. and Kwon, O.K. (1989) Cytological studies of Corbicula papyracea (Bivalvia: Corbiculidae) in the lake Uiam. J. Science and Technology, Kangweon Nat. Univ., 28: 77-82. [in Korean]
Park, G.M., Yong, T.S., Im, K.I. and Chung, E.Y. (2000)Karyotypes of three species of Corbicula (Bivalvia:Veneroida) in Korea. Journal of Shellfish Research, 19: 979-982.
Park, G.M. and Chung, E.Y. (2003) Molecular phylogenetics of five Corbicula species determined by partial 28S ribosomal RNA gene sequences. Journal of Shellfish Research, 22: 481-485.
Park, J.J., Lee, J. S. and Chang, Y.J. (2003) Gonadal development and gametogenic cycle of the equilateral venus, Gomphina veneriformis (Bivalvia: Veneridae). Journal of Korean Fisheries Society, 36: 213-218. [in Korean]
Shin, Y.K., Choi, N.J., OH, B.S., Jung A.J. and Kim, S.Y. (2007) Development and reproductive cycle of the purplish Washington clam, Saxidomus purpuratus (Bivalvia: Veneridae) from Gangin Bay. Korean journal of Malacology, 23(2): 165-172. [in Korean]
