The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Gomphina (Macridiscus) veneriformis (Lamark, 1818) (Bivalvia: Veneridae) in the East Sea of Korea

  • Kim, Yong Ho (Department of Aquaculture and Aquatic Sciences, Kunsan National University) ;
  • Kim, Sung Han (Department of Aquaculture and Aquatic Sciences, Kunsan National University) ;
  • Chung, Ee-Yung (Korea Marine Environment and Ecosystem Research Instittute) ;
  • Lee, Chang-Hoon (Institute of Environmental Protection and Safety, Neoenbiz Co.) ;
  • Kwak, Cheol Woo (Korea Marine Environment and Ecosystem Research Instittute)
  • Received : 2013.12.05
  • Accepted : 2013.12.23
  • Published : 2013.12.31
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Abstract

Gonad development, the reproductive cycle, first sexual maturty and size at 50% of group sexual maturity (the biological minimum size) of Gomphina (Macridiscus) veneriformis were investigated for clams collected from the coastal waters of Donghae City, the East Sea of Korea by histological, and morphometric analysis. Monthly variations of the gonad index showed a pattern similar to that of the reproductive cycle. The reproductive cycle with the gonad developmental stages in female and male G. (M.) veneriformis can be classified into five successive stages: early active stage (December to March), late active stage (March to June), ripe stage (June to July), partially spawned stage (June to August), and spent / inactive stage (September to December). The spawning period continued from June to August, with a peak between July and August when the seawater temperature exceeds $20^{\circ}C$. The percentages of first sexual maturities of female and male clams ranging from 25.1 to 30.0 mm were 56.3% in females and 61.1% in males, and for clams over 30.1 mm shell length, it was 100%. Shell lengths at 50% of group sexual maturity (biological minimum size, $RM_{50}$) were 27.71 mm in females and 26.31 mm in males. Because harvesting clams < 26.31 mm in shell length could potentially cause a drastic reduction in recruitment, a measure indicating a prohibitory fishing size should be taken for adequate fisheries management.

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References

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