The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Gametogenic Cycle and the Size at 50% of Group Sexual Maturity in Male Chlamys (Azumapecten) farreri nipponensis (Kuroda, 1932) (Bivalvia: Pectinidae) in Western Korea

  • Park, Ki Yeol (Yangyang Salmon Station, Korea Fisheries Resources Agency) ;
  • Chung, Ee-Yung (Department of Marine Biotechnology, Kunsan National University) ;
  • Lee, Ki-Young (Department of Marine Biotechnology, Kunsan National University) ;
  • Park, Kwan Ha (Department of Aquatic Life Medicine, Kunsan National University)
  • Received : 2013.03.18
  • Accepted : 2013.03.26
  • Published : 2013.03.31
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Abstract

We investigated the gametogenic cycle and spawning seasons of the male Chlamys (Azumapecten) farreri nipponensis by qualitative and quantitative analyses, and also the size at 50% of group sexual maturity was calculated by the data of first sexual maturity. In this study, the male gametogenic cycle of this species by qualitative analysis was divided into five successive stages: early active stage (January to March), late active stage (March to April), ripe stage (April to August), partially spawned stage (July to September), and spent/inactive stage (August to January). The male gametogenic cycle showed similar patterns with monthly changes in the gonadosomatic index and condition index. Particularly, spawning in male scallop occurred once a year from July to September, unlike the spawning period of this species (from June to August) reported by the previous researchers. In quantitative statistical analysis using an image analyzer system, the patterns of monthly changes in the percent (%) of the areas occupied by spermatogenic stages to the testis areas in males showed a maximum in June, and then sharply dropped from July to September, 2006. From these data, it is apparent that the spawning season of C. (A.) farreri nipponensis occurred once per year from July to early September, indicating a unimodal gametogenic cycle during the year. Shell heights at 50% of group sexual maturity (RM50) fitted to an exponential equation were estimated to be 49.90 mm in males (considered to be one year old), and it was 100% for male scallops over 61.0 mm (considered to be two years old).

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References

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