open access
메뉴
open access
메뉴
ISSN : 1225-3480
Gonadosomatic index, reproductive cycle, spermatogenesis and first sexual maturity of Chlamys farreri were investigated by cytological and histological observations, from January 1998 to December 1999. The gonadosomatic index (GSI) rapidly increased in April and reached a maximum in May when seawater temperature rapidly increase. Then the GSI gradually decreased from June to August when spawning occur. Accordingly, monthly changes in the GSI in males coincide with the reproductive cycle. The spermatozoon of Chlamys farreri is the primitive type found in external fertilization species. The head of the spermatozoon is approximately <TEX>$2.75{\mu}m$</TEX> in length including the acrosome measuring about <TEX>$0.50{\mu}m$</TEX> in length, and its tail was approximately <TEX>$20{\mu}m$</TEX>, the axoneme of the tail flagellum consists of nine pairs of microtubules at the periphery and a pair at the center. Five spherical mitochondria around the centriole (the satellite body) appear in the middle piece of the sperm. The spawning period was from June to August and the main spawning occurs from July to August when seawater temperatures are greater than <TEX>$20^{\circ}C$</TEX> The reproductive cycle of this species can be categorized into five successive stages; early active stage (January to March), late active stage (March to April), ripe stage (April to August), partially spawned stage (June to August), and spent/inactive stage (August to January). Over 50% of male scallops attained first sexual maturity between 50.0 and 60.0 mm in shell height, and 100% of those over 60.0 mm in shell height achieved maturity. Accordingly, we assume that male individuals begin reproduction at three years of age.
(1962183-192) On the reproductive cycle and breeding habits of two western species of Haliotis,
(2004) Karyotype analysis and reproductive characteristics of the diploid brackish water clam, Kunsan National University
(1991) Sexual maturation of the venus clam on the west coast of Korea Journal of Medical and Applied Malacology,
(1997) Ultrastructural study of germ cell development and reproductive cycle of the hen clam,
(2000) Gametogenesis and sexual maturation of the surf clam Mactra veneriformis on the west coast of Korea,
(1970) Phylogenetic aspects of the morphology of spermatozoa and spermiogenesis, Academic Press
(2000) A study on the growth and spawning of Korean scallop,
(2001) Spermatogenesis and comparative ultrastructure of spermatozoa in several species of Korean economic bivalves, Pukyung National University
(1996) Ultrastructure of biflagellate spermatozoa in the freshwater clam,
(1997) Hermaphroditic freshwater clams in the genus Corbicula produce non-reductional spermatozoa with somatic DNA content,
(1997) Feeding and growth of scallop Chlamys farreri before and after spawning ,
(1993) Coloured shells of Korea, Academy Publishing Company
(1995) Studies on the technology development for seed production of Chlamys farreri Technical Report of South Sea Regional Fisheries Research Institute,
(1983) Reproductive cycle of the scallop Chlamys farreri Journal of Fisheries of China,
(1995) A study on seedling production of Jicon scallop Development and rearing of larvae ,
(2002) Reproductive ecology and seed production of Jicon scallop, Sooncheonhyang University
(1979) Comparative spermatozoon morphology and bivalve phylogeny,
(1996) Studies on suitable cultures depths and method for scallop in Sanggou Bay ,
(1997) The culture experiment of scallop Chlamys farreri in Nanji Islands Zhejiang College of Fisheries, Zhejiang College of Fisheries
(1973) Study on the distribution and ecology of Chlamys farreri nipponensis Kuroda around the Taehuksan Island,
(1995) The reproductive cycle of the scallop Chlamys farreri in the sea of Japan Biology and Aquaculture of Pectinids,
(1999a) Triploid induction in Chlamys farreri by application of 6-dimethylaminopurine ,
(1999b) Growth characteristics of Chlamys farreri and its relation with environmental factors in the intensive raft-culture areas of Sishiliwan Bay ,
(1976) Korean shells in colour,