한국양식학회지 (Journal of Aquaculture)

한국양식학회 (The Korean Society of Fisheries and Aquatic Science)
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웅어, Coilia nasus의 생식주기에 관한 조직학적 연구

Histological Study on the Reproductive Cycle of Coilia nasus

  • 이봉우 (충남내수면개발시험장) ;
  • 정의영 (군산대학교 해양생명과학부) ;
  • 이정열 (군산대학교 해양생명과학부)
  • 발행 : 2003.08.01
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초록

본 연구는 2002년 2월부터 2003년 1월까지 군산 내항과 충청남도의 서천군 장항읍과 전라북도의 군산시를 연계한 금강하구둑 유역에서 채집된 웅어 , Coilia nasus를 대상으로 산란기를 추정하기 위해 생식소중량지수(GSI), 생식소 발달단계에 따른 생식주기를 조직학적 관찰에 의해 조사하였다. 웅어는 자웅이체이고 난소는 한 쌍의 낭상구조를 하고 있으며 수많은 난소소엽으로 구성되어 있다. 그리고 정소는 한 쌍의 엽상 구조를 하고 있으며 수많은 정소소엽으로 이루어져 있고 후부의 저정낭에 연결되어 있다. 암ㆍ수의 생식소중량지수(GSI)의 월별 변화는 4월에 GSI값이 증가되기 시작하여 난소와 정소가 성숙되고 고수온-장일장이 되는 하계의 6월에 최대에 이른다. 생식주기는 암컷의 경우, 초기성장기(2~3월), 후기성장기(3~4월), 성숙기(5~6월), 완숙 및 산란기(6~7월),회복 및 휴지기(7~l월)의 연속적인 5단계로 구분되었고, 수컷의 경우는 성장기(2~4월), 성숙기(5~7월), 완숙및 방정기(6~7월),회복 및 휴지기(7~l월)의 연속적인 4단계로 구분할 수 있었다. 산란기 난경 빈도분포에 의하면, 웅어는 연중 한번의 산란기를 가지며 한 개체가 최소한 2~3회를 산란하는 다회산란종으로 추정되었다.

Reproductive cycle, gonadal development and the spawning period of the Korean anchovy Coilia nasus were investigated by histologhical observations. Samples were collected at the coastal area of Geumgang dyke which is connected to Gunsan and Janghang, Korea, from February 2002 to January 2003. C. nasus is dioecious; the ovary consists of a pair of saccular structure with many ovarian lobules, and the testis consists of a pair of lobular structure with many testicular lobules and connected to the posterior seminal vesicle. Monthly changes in the gonadosomatic index (GSI) began to increase in April when seawater temperature increased and reached the maximum in June when the ovary was getting mature, the summer season of longer day length with higher water temperature. The reproductive cycle can be classified into five successive stage in females: early growing stage (February to March), late growing stage (March to April), mature stage (May to June), ripe and spent stage (June to July), and recovery and resting stage (July to January): in males, the cycle can be divided into four successive stages; growing stage (February to April), mature stage (May to July), ripe and spent (June to July), and recovery and resting stages (July to January). According to the frequency distributions of egg diameters in the spawning season. C. nasus is presumed to be summer spawning species and polycyclic species to spawn 2 times or more during the spawning season.

키워드

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