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Growth of a Land-locked Ayu, Plecoglossus altivels (Pisces: Osmeridae) and Weir Obstruction in Lake Okjeong, Korea  

Ko, Myeong-Hun (Faculty of Biological Science, College of Natural Science, Chonbuk National University, Institute for Biodiversity Research, Chonbuk National University)
Kim, Ik-Soo (Faculty of Biological Science, College of Natural Science, Chonbuk National University, Institute for Biodiversity Research, Chonbuk National University)
Park, Jong-Yeong (Faculty of Biological Science, College of Natural Science, Chonbuk National University, Institute 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.2, 2007 , pp. 142-153 More about this Journal
Abstract
Fertilized eggs of Plecoglossus altivelis over than 1,000,000 were introduced into Okjeong, Jeollabuk-do, Korea by K-water, 2001. Since then, this lake and the neighbouring tributaries gave sufficient habitat to maintain their life cycle which are being the land-locked. A land-locked ayu of annual life is ascending and descending from Lake Okjeong to streams for spawning and growth. Among the streams, the Churyeong stream reaching about 32 km in length is a major site for growth and spawning. But the land-locked ayu was no longer seen in the upper regions of the Churyeong stream over than about 12 km distance from Lake Okjeong. Because there were 11 weirs along with the Churyeong stream, it was difficult for them to move freely up to upper regions, and it causes irregular growth condition although they must be actively growing with feeding for spawning. During three survey years (2004 to 2006), in lowest rainfall-recorded 2005, the ayu population was not able to move up actively across the weirs and just stayed around the weirs, and finally it let them grow slowly and unstably. Also although there are 11 weirs, only 3 fish ways existed. Such environmental factors will seriously affect growth, spawning and size of ayu population in this area.
Keywords
Plecoglossus altivelis; Lake Okjeong; growth;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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