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Sexual Maturation and Spawning Characteristics in Greenling, Hexagrammos otakii of the West Coast in Korea  

강희웅 (국립수산과학원 서해수산연구소)
정의영 (군산대학교 해양생명과학부)
김종화 (국립수산과학원 보령수산종묘시험장)
Publication Information
Journal of Aquaculture / v.17, no.1, 2004 , pp. 30-38 More about this Journal
Abstract
To estimate the spawning period the annual change of gonadosomatic index (GSI) were examined from January 2000 to December 2001. Fecundity, spawning frequency and egg diameter were measured by ocular observation. Germ cell differentiation during gametogenesis, the reproductive cycle and the first sexual maturity of greenling Hexagrammos otakii were observed under light microscopy from January to December, 2000. GSI began to increase in August and reached the maximum in November when ovary was getting mature. The reproductive cycle of H. otakii can be divided into five successive stages in females: early growing stage (July), late growing stage (July to August), mature stage (September to October), ripe and spent stage (September to December), and recovery and resting stage (December to June). Males showed four successive stages : growing (June to August), mature (August to October), ripe and spent (September to December), and recovery and resting stage (December to May). According to the frequency distributions of egg diameter in spawning season, H. otakii could be one of polycyclic species spawning 2 times or more during one spawning season. Number of total eggs and mature eggs in the absolute fecundity were related to the standard length and body weight, respectively. Number of total eggs and mature eggs in relative fecundity were also proportional to the standard length, but rather these numbers decreased with body weight. Percentages of first sexual maturity of females and males in greenling were over 50% from 19.1 to 21.1cm in length, and 100% for fish over 25.1cm in length. Therefore, both sexes are ready to reproduce after one year old.
Keywords
Fecundity; First sexual maturity; Reproductive cycle; Spawning period; Spawning frequency;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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