Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Gonadal Development and Reproductive Cycle of the Ark shell Scapharca subcrenata (Bivalvia: Arcidae) from Yeoja Bay

여자만 새꼬막 Scapharca subcrenata의 생식소 발달과 생식주기

  • 김성연 (국립수산과학원 양식관리과) ;
  • 신윤경 (국립수산과학원 남해특성화연구센터) ;
  • 임한규 (국립수산과학원 양식관리과) ;
  • 이원찬 (국립수산과학원 환경연구과)
  • Published : 2008.11.25
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Abstract

Gonadal development and reproductive cycle of the ark shell Scarpharca subcrenata were investigated by histological observations. Samples were collected monthly from March 2007 to February 2008 in the Yeoja Bay, Yeosu, Jeollanam-do, Korea. S. subcrenata was dioecious. The gonads consist of a number of oogenic follicle and acinus. Monthly changes in the gonad index reached a maximum in June and a minimum in September. Monthly changes in the condition index reached a maximum in April and a minimum in September. The reproductive cycle of this species can be divided into five successive stages: early active stage (January to April), late active stage (March to June), ripe stage (May to August), spent stage (July to September) and recovery and resting stage (September to March). The main spawning of S. subcrenata occurred in July and August in Yeoja Bay. The sex ratio of female to male was not significantly different from 1:1.

전라남도 여수시 소라면 여자만에서 2007년 3월부터 2008년 2월까지 채집된 새꼬막 Scapharca subcrenata의 생식소 발달과 생식주기를 조직학적으로 조사하였다. 새꼬막은 자웅이체로 난소는 많은 난소 소낭(oogenic follicle)으로 이루어져 있으며, 정소도 많은 정소 소낭(acinus)으로 구성되어 있다. 생식소지수(GI)는 6월에 연중 최고 값을 나타내었고, 그 후 감소하여 7월에 최저 값를 나타내었다. 비만도지수(CI)는 4월에 연중 최고 값을 보였고, 그 후 감소하여 7월에 최저 값을 보였다. 새꼬막의 생식주기는 초기 활성기($1{\sim}4$월), 후기 활성기($3{\sim}6$월), 완숙기($5{\sim}8$월), 방출기($7{\sim}9$월) 그리고 회복 및 휴지기($9{\sim}3$월)의 연속적인 발달 단계로 구분되었으며, 주 산란기는 $7{\sim}8$월로 조사되었다. 암, 수 성비는 1:1로 유의한 차를 보이지 않았다.

Keywords

References

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