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ISSN : 1225-3480

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26권 3호

Gametogenic Cycle and the Number of Spawning Seasons by Quantitative Reproductive Analysis in Female Ruditapes philippinarum in Western Korea

Gametogenic Cycle and the Number of Spawning Seasons by Quantitative Reproductive Analysis in Female Ruditapes philippinarum in Western Korea

Chung, Ee-Yung (Korea Marine Environment & Ecosystem Institute, Dive Korea)
Lee, Chang-Hoon (Neoenbiz Co.)
Choi, Ki-Ho (West Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
Choi, Moon-Sul (Department of Marine Biotechnology, Kunsan National University)
Lee, Ki-Young (Department of Marine Biotechnology, Kunsan National University)
한국패류학회지 / The Korean Journal of Malacology, (P)1225-3480;
2010, v.26 no.3, pp.245-254
Chung, Ee-Yung, Lee, Chang-Hoon, Choi, Ki-Ho, Choi, Moon-Sul, & Lee, Ki-Young. (2010). Gametogenic Cycle and the Number of Spawning Seasons by Quantitative Reproductive Analysis in Female Ruditapes philippinarum in Western Korea. , 26(3), 245-254.

Abstract

For the studies of germ cell development and maturation in the ovary, the gametogenic cycle and the number of spawning seasons per year in female Ruditapes philippinarum were investigated by quantitative statistical analysis using an Image Analyzer System. Compared with the results by qualitative and quantitative analyses, monthly variations in female gonad indice by qualitative histological analysis showed a pattern similar to that of the female gametogenic cycle calculated by quantitative statistical analysis. The number of spawning seasons occurred once per year, from June to October. In quantitative statistical analysis using an image analyzer system, monthly changes in the portions (%) of the ovary area to total tissue areas in females increased in March and reached a maximum in May, and then showed a rapid decrease from June to October when spawning occurred. And also monthly changes in portions (%) of follicle areas to the ovary area and in portions of oocyte areas to ovarian tissue areas in females began to increase in March and reached a maximum in May, and then. rapidly dropped from June to October when spawnig occurred. From these data, it is apparent that the number of spawning seasons occurred once per year, from June to October. Monthly changes in the number of the oocyte per $mm^2$ and in mean diameter of the oocyte in captured image which were calculated for each female slide showed a maximum in May and reached the minimum from December to February. Therefore, female R. philippinarum showed a unimodal gametogenic cycle during the year.

keywords
Ruditapes philippinarum, gametogenic cycle, spawning season, quantitative analysis

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