피라미 개체군의 length-weight relationship 및 condition factor(K)를 이용한 공지천수계의 생태적 진단

초록

The purpose of this study is to investigate the dynamics of the Zacco platypus population amongstreams in the Gongjicheon water system, Korea from December 2010 to October 2011. In thisstudy, fish fauna was collected 27 Species belonged to 9 Families. The legal protection species,such as a natural monument and endangered species was not collected. Korean endemic specieswas collected 6 species including to Z. koreanus. The ratio of Korean endemic species was 22.6%,and it was lower than 51.3% that average of Korean endemic species in the Hangang water system. About these status, we considered that Gongjicheon water system had lost of the uniquecharacteristics of the Hangang water system by the anthropogenic disturbances. The result of analysis to length-weight relationship and condition factor(K) of Z. platypuspopulation in the Gongjicheon water system, the regression coefficient value(b) to indication ofgrowth degree of the population was 3.04 and the slope of the condition factor(K) to indication ofcorpulency had positive value, respectively. These results seems to be that the Z. platypuspopulation is maintained to a little unstably. In addition, the values of the degree of growth andcorpulence were very low than the other natural streams in the Hangang water system, so it considered that the many artificially stress factors are occurred in this study area. These resultsare similar to Fish Assessment Index(FAI) in the assessment for health of aquatic ecosystem. Therefore, we are considered to require precise investigation and sustained monitoring for therestorations of stream ecosystem in the Gongjicheon water system.

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