Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Seasonal Changes in Gonadal Development of Manila Clam, Ruditapes philippinarum from Shi-Heung-Ri, Jeju, Korea

제주도 시흥리 연안에 분포하는 바지락, Ruditapes philippinarum의 계절에 따른 생식소발달

  • 강도형 (제주대학교 해양과학대학 해양과학부) ;
  • 고티투타오 (제주대학교 해양과학대학 해양과학부) ;
  • 고광종 (제주대학교 해양과학대학 해양과학부) ;
  • 최광식 (제주대학교 해양과학대학 해양과학부)
  • Published : 2004.02.01
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Abstract

Annual gametogenic cycle of Manila clam Ruditapes philippinarum collected from Shi-Heung-Ri beach in Jeju was investigated for the 12 month period from May 2001 to April 2002. Water temperature varied from 10 to 27$^{\circ}C$ and salinity from 27 to 35 psu during the course of study. Most of the clams collected in March were in indifferent or in early developing indicating that clams initiated gametogenesis when water temperature becomes 14 to 15$^{\circ}C$. In early June, most of the clams were in developing, expanding follicles and exhibiting growing oocytes. Fully ripe gonads were observed in clams collected during late June to early August. Spawning clams were observed as early as in early June although the spawning activity reached its maximum in early August. Condition index (CI) was rapidly increased from July to early August and then dropped in late August, indicating that most of clams in Shi-Heung-Ri beach spawn in late summer when water temperature was within a range of 25 to 27$^{\circ}C$.

제주도 동부연안 시흥리에 서식하는 바지락의 월 별 생식소 발달과 산란시기를 파악하기 위해 2001년 5월부터 2002년 4월까지 시흥리 해안에서 바지락을 채집, 분석하였다. 채집지역의 수온은 10∼27$^{\circ}C$의 범위를 보였으며, 염분은 27∼35 psu의 연중변화를 보였다. 3월에 채집된 대부분 개체들의 생식소는 미분화기와 발달기의 상태로 관찰되었으며, 이 때 수온은 약 14$^{\circ}C$이었다. 6월에 채집한 개체들의 생식소는 대부분 발달기의 상태를 보였으며, 6월말부터 8월초까지 성숙하였다. 6월말부터 7월 중순까지 채집된 개체의 생식소는 발달기, 완숙기 및 부분산란기의 혼재된 양상을 띠었다. 직경이 55∼65$\mu\textrm{m}$ 범위의 성숙한 난들은 7월 중순과 8월초에 많이 관찰되었고, 연중 비만도의 평균값은 8월초에 가장 높았다. 산란은 6월말부터 부분적인 산란이 이루어져 9월까지 진행됐고, 주산란시기는 7월부터 8월까지인 것으로 관찰되었다. 이 연구의 결과는 제주도에 서식하는 바지락이 수온 25∼27$^{\circ}C$ 범위인 여름철에 산란한다고 볼수 있고, 식물플랑크톤의 번성시기와 밀접한 관계가 있는 것으로 생각된다.

Keywords

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