Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Sexual Maturation and Spawning Characteristics in Greenling, Hexagrammos otakii of the West Coast in Korea

서해산 쥐노래미, Hexagrammos otakii의 성성숙과 산란 특성

  • 강희웅 (국립수산과학원 서해수산연구소) ;
  • 정의영 (군산대학교 해양생명과학부) ;
  • 김종화 (국립수산과학원 보령수산종묘시험장)
  • Published : 2004.02.01
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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.

본 연구는 2000년 1월부터 2001년 12월까지 쥐노래미, Hexagrammos otakit를 대상으로 산란시기를 간접적으로 추정하기 위하여 생식소중량지수(GSI)의 연간변화를 조사하였다. 또한 2000년 1월부터 12월까지 포란수, 산란횟수, 난경조성을 육안적 관찰로 연구하였다. 배우자 형성과정 중 생식세포 분화, 생식소발달 단계에 따른 생식주기, 군성숙도에 관해서 광학현피경으로 연구하였다. GSI의 연간변화는 암컷과 수컷에서 8월에 증가되기 시작하여 저수온기인 10∼11월에 최대값을 나타냈다. 생식연주기는 암컷에서 초기성장기(7월), 후기성장기(7∼8월), 성숙기 (9∼10월), 완숙 및 산란기 (9∼12월), 회복 및 휴지기(12월∼6월)로 구분되었고, 수컷에서는 성장기(6∼8월), 성숙기(8∼10월), 완숙 및 방정기(9∼12월), 회복 및 휴지기(12월∼5월)의 연속적인 단계로 구분할 수 있었다. 성숙 및 산란기인 9∼12월 사이의 난소내 난경조성의 조사 결과, 쥐노래미는 2∼3회 이상 산란하는 다회 산란어종으로 확인되었다. 번식력을 측정하는 총포란수와 성숙란수는 체장이 커질수록 포란수도 많아지고, 체중에도 비례하여 증가하였다. 단위 체장당 총포란수와 성숙란수는 체장의 증가에 따라 증가하였으나, 단위 체중당 포란수는 체중증가에 따라 감소하였다. 군성숙도 조사에서 50%이상 산란에 참여하는 개체는 암$.$수의 체장 19.1∼21.0cm 이었으며, 25.1cm 이상에서 전 개체가 산란에 참여하였으며, 생식에 가담하는 암ㆍ수의 연령은 1세부터였다.

Keywords

References

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