초록

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2001년 10월에 한국수자원공사는 은어 Plecoglossus altivelis 수정란 100만립을 옥정호에 방류하였고 이후 은어는 육봉화 되었다. 육봉형 은어의 분포 및 생태를 조사한 결과 옥정호 유입하천인 조원천, 추령천, 옥녀동천의 비교적 유속이 빠르고 바닥이 큰 돌과 암반으로 된 지역에 4월부터 10월까지 서식하였다. 부화된 자어는 옥정호로 내려가 11월부터 이듬해 3월까지 서식하였다. 산란기는 9월 중순부터 10월 중순까지로 나타났으며, 산란 장소는 비교적 유속이 빠르고 자갈이 깔린 곳으로 수심은 30~70 cm, 수온은 $20{\sim}22^{\circ}C$였다. 성비는 암컷 대 수컷이 1 : 2.70이었고, 체장은 암컷과 수컷이 $90{\sim}220(142{\pm}29.3)mm$로 암 수 차이가 없었다. 포란수는 414,283~91,500개로 조사되었다.

Abstract ▼ AI-Helper

After releasing more than 1,000,000 fertilized eggs of Plecoglossus altivelis into Lake Okjeong, Jeollabuk-do, on October, 2001 by KOWACO, they seem to be land-locked. Study on the distribution and ecology of a land-locked ayu, P. altivelis, was performed from Lake Okjeong to upper streams as Jowon,...

After releasing more than 1,000,000 fertilized eggs of Plecoglossus altivelis into Lake Okjeong, Jeollabuk-do, on October, 2001 by KOWACO, they seem to be land-locked. Study on the distribution and ecology of a land-locked ayu, P. altivelis, was performed from Lake Okjeong to upper streams as Jowon, Churyeong, Oknyedong where consisted of rocky bottom with fast current freshwater system during April to October. The hatched larva and juveniles descended from streams to Lake Okjeong and inhabit Lake Okjeong from November to next March. The sex ratio of female to male was 1 : 2.70, and the size in standard length of females and males was similar, in $90{\sim}220(142{\pm}29.3)mm$. During the middle September to the middle October, they laid eggs on the pebbly bottom of the rapids which are $20{\sim}22^{\circ}C$ in water temperature and 30~70 cm in depth. The number of full-grown eggs was greatly various from 14,283~91,500.

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