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Gametogenic Cycle by Quantitative Statistical Analysis and the Biological Minimum Size in Protothaca (Notochione) jedoensis (Bivalvia: Veneridae) in Western Korea
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  • Journal title : The Korean Journal of Malacology
  • Volume 27, Issue 3,  2011, pp.261-271
  • Publisher : The Malacological Society of Korea
  • DOI : 10.9710/kjm.2011.27.3.261
 Title & Authors
Gametogenic Cycle by Quantitative Statistical Analysis and the Biological Minimum Size in Protothaca (Notochione) jedoensis (Bivalvia: Veneridae) in Western Korea
Park, Kwan-Ha; Chung, Ee-Yung; Lee, Chang-Hoon; Kim, Sung-Han; Kim, Sung-Yeon; Seo, Won-Jae; Ryu, Dong-Ki;
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 Abstract
The gametogenic cycle, the spawning season and the biological minimum sizes in female and male Protothaca (Notochione) jedoensis were investigated by quantitative statistical analysis. In females, monthly changes in the percents of the follicle areas to the ovarian tissue areas and the percents of the oocyte areas to the ovarian tissue areas increased in February and reached the maximum in April, and then gradually decreased from May to July, with the spawning peak between June and July. In males, monthly changes in the percents of the testicular tissue areas to total tissue areas and the percents of the spermatogenic stage areas to the testicular tissue areas increased in February and reached the maximum in April, and then showed a rapid decrease from May to July. From these data, it is apparent that the number of spawning seasons in female and male P. (N.) jedoensis occurred once a year, from May to July. Therefore, P. (N.) jedoensis in both sexes showed a unimodal gametogenic cycle during the year. Compared the gametogenic cycle by quantitative statistical analysis in 2007 with the previous qualitative results of this species, the results of the gametogenic cycle calculated by quantitative statistical analysis showed some differentiations in the spawning seasons evaluated by the gonad index by qualitative histological analysis. The intervals of the beginning of two spawning seasons showed one month between the results of quantitative and qualitative analyses. The biological minimum sizes (considering to 50% of group sexual maturity) in female and male clams by quantitative analysis of this species are 32.01 mm in shell length in females and 30.58 mm in males, respectively. According to the mean shell length fitted to von Bertalanffy's equation, 30.58 and 32.01 mm in shell length were considered to be two years old. Therefore, we assume that both sexes of this population begin reproduction from two years of age.
 Keywords
Protothaca (Notochione) jedoensis;gametogenic cycle;spawning season;quantitative analysis;biological minimum size;
 Language
English
 Cited by
1.
The evolution of gonad expenditure and gonadosomatic index (GSI) in male and female broadcast-spawning invertebrates, Biological Reviews, 2017, 14647931  crossref(new windwow)
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