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Histological Study on the Reproductive Cycle of Coilia nasus  

이봉우 (충남내수면개발시험장)
정의영 (군산대학교 해양생명과학부)
이정열 (군산대학교 해양생명과학부)
Publication Information
Journal of Aquaculture / v.16, no.3, 2003 , pp. 179-186 More about this Journal
Abstract
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.
Keywords
Coilia nasus; Reproductive cycle; Histological observation; Gonadosomatic index;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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