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Distribution and Ecology of a Land-Locked Ayu, Plecoglossusaltivelis (Pisces: Osmeridae) in Lake Okjeong, Korea  

Ko, Myeong-Hun (Faculty of Biological Science, College of Natural Science, Chonbuk National University and Institut for Biodiversity Research, Chonbuk National University)
Kim, Ik-Soo (Faculty of Biological Science, College of Natural Science, Chonbuk National University and Institut for Biodiversity Research, Chonbuk National University)
Park, Jong-Yeong (Faculty of Biological Science, College of Natural Science, Chonbuk National University and Institut for Biodiversity Research, Chonbuk National University)
Lee, Yong-Joo (Department of Science Education, Jeonju National University of Education)
Publication Information
Korean Journal of Ichthyology / v.19, no.1, 2007 , pp. 24-34 More about this Journal
Abstract
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.
Keywords
Plecoglossus altivelis; Lake Okjeong; population ecology;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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