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http://dx.doi.org/10.11626/KJEB.2013.31.4.393

Influence of Fish Compositions and Trophic/Tolerance Guilds on the Fishkills in Geum-River Watershed (Backje Weir)  

Kwon, Hyuk-Hyun (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Han, Jeong-Ho (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Yoon, Johee (Geum-River Environment Research Center National Institute of Environmental Research)
An, Kwang-Guk (Department of Biological Sciences, College of Biosciences and Biotechnology, Chungnam National University)
Publication Information
Korean Journal of Environmental Biology / v.31, no.4, 2013 , pp. 393-401 More about this Journal
Abstract
The objectives of this study were to analyze structures of fish community and the ecological health using a multi-metric fish model, the Index of Biological Integrity (IBI) in the Backje Weir of Geum River during two periods namely before-the-fishkill ($B_f$) and after-the-fishkill ($A_f$). The total number of fish species observed were 32 and among them 10 species (35%) were Korean endemic species. The exotic species observed were 3 which decreased by 0.4% after-the-fishkill ($A_f$). The dominant species were Opsariichthys uncirostris amurensis (13%) at the Bf period and Squalidus japonicus coreanus (17%) at the Af period in the Backje Weir. At after the fishkill ($A_{f-I}$) total biomass was about 10 times lower than the biomass before-the-fishkill ($B_f$). The biomass of Carassius auratus decreased 98% after-the-fishkill and as time passed by the biomass recovered to nearly 100%. Similar decrease in the biomass occurred in the population of Opsariichthys uncirostris amurensis, while Rhinogobius brunneus population increased. According to the structure analysis of fish community, species richness index, evenness index and species diversity index were high but after-the fishkill, the values of indices decreased. Tolerant species (64%) dominated the fish community, and the sensitive species (2%) were rare, indicating the degradation of the ecosystem. According to analysis of the multi-metric model (IBI), the mean model value of the fish community in Backje Weir was estimated as 17.5 indicating a "fair condition".
Keywords
fishkill; Geum River; Backje Weir; turnover; fish community;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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