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http://dx.doi.org/10.13047/KJEE.2020.34.6.543

Changes in Icthyofauna of Hapcheon Lake and Characteristics of the Bluegill, Lepomis macrochirus Population  

Jang, Chang-Ryeol (Division of Life Science, Incheon National Univ.)
Bae, Yang-Seop (Division of Life Science, Incheon National Univ.)
Publication Information
Korean Journal of Environment and Ecology / v.34, no.6, 2020 , pp. 543-550 More about this Journal
Abstract
This study aimed to identify the characteristics of fish inhabiting Hapcheon Dam and surrounding rivers and the Bluegill population, an invasive species, and provide basic data. The survey of fish living in Hapcheon Dam and surrounding tributaries in the Ulsan area from 2016 to 2017 identified a total of 1,785 individuals of 30 species of 10 families and identified 8 Korea's endemic species (21.8% indigenization rate), 3 exotic species, and 2 ecosystem disturbance species. The comparison of this study with the past survey showed that 36 species of 12 families were reported in the past survey, but 14 species of them were not found in this study. We believe that a more detailed survey of Lake Hapcheon should identify most of them. The analysis of the length-weight relationship for the Bluegill population, identified as the dominant species in the Hapcheon Lake, showed that a large number of populations was in the stage of rapid growth as a large number of populations aged 1 to 2 years was found. Since the obesity level and the length-weight relationship were confirmed to be in good condition, it was necessary to prepare a plan to control the Bluegill population. We expect that this study's results can be useful data for understanding the growth and trends of the Bluegill population inhabiting the Hapcheon Dam and surrounding rivers.
Keywords
EXOTIC SPECIES; LENGTH-WEIGHT RELATIONSHIP; AGE STRUCTURE; CONDITION FACTOR(K);
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