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Fish Community and Stream Health Assessment in Lake Chungju and its Tributaries  

Choi, Myung-Jae (Research and Development Department, EojinENG Co.)
Park, Hae-Kyung (Water Environment Research Department, National Institute of Environment Research)
Yun, Seuk-Hwan (Han River Environmental Research Center, National Institute of Environment Research)
Lee, Jangho (Environmental Resources Research Department, National Institute of Environment Research)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.2, 2012 , pp. 185-196 More about this Journal
Abstract
The fish community within the lake and 5 tributaries of Lake Chungju in spring and autumn, 2009 was surveyed. In this study, the total 128,506 individuals were collected belonging to 11 families 29 genera 34 species. The most dominant species was Squalidus japonicus coreanus that account for 91.6% of population and 49% of biomass of fish community. In the point of population, dominant species were small-sized species, which became the prey of big-sized predatory species. In the point of biomass, dominant species were predatory species which were large-sized. The most dominant species in lacustrine area was S. japonicus coreanus which accounted for 92.2% of total population and 49.1% of total biomass. The most dominant species of tributary streams was Tridentiger brevispinis which accounted for 66.4% of total population and 55.1% of total biomass. The site of C3 in lacustrine area and Dongdal-cheon in tributary streams collected the most number of species. Through ecological health evaluation of five tributary streams using 8 metric index of biological integrity (IBI) model, two streams (Dongdal-cheon, Kwang-cheon were evaluated as, "B", "good" condition, and Jangsung-cheon obtained grade C indicating "Fair" condition, Jecheon-cheon obtained grade D indicating "Poor" condition based on IBI model. Lepomis macrochirus which was designated as a domestic ecosystem-disturbing alien species with wide food niche have shown tendency to increase the number of individuals since 1991 indicating the adverse effect on not only fish community but also aquatic ecosystem food web of Lake Chungju.
Keywords
Fish community; Index of biological integrity; Lake Chungju; Lepomis macrochirus;
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