Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Estimation of Standard Length-Weight Relationships of 10 Freshwater Fish in the South Korea for Application of Relative Weight Index

한국 담수어류 10종의 상대 무게지수(Relative weight index) 활용을 위한 표준 길이-무게 상관관계(Standard Length-Weight relationships) 산출

  • Received : 2020.02.25
  • Accepted : 2020.03.30
  • Published : 2020.06.30
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Abstract

The Relative weight index is an index for evaluating nutritional condition of fish by calculating a ratio of observed weight to standard weight. The purpose of this study is estimating standard Length-Weight relationships (standard LWRs) to calculate standard weight for application of relative weight index and analyze frequency distribution of relative weight index of 10 freshwater fish in the South Korea. The standard LWRs for each species was calculated by the Length-Weight data sets from 798 times of captures at 141 sites. The correlation of determination (r2) for all species was over 0.9 and values of parameter b were within the expected range according to Froese (2006). We calculated in increments of 10 from 10 to 90 percentile of relative weight index for each species, and it could be used as a standard for quantitative assessment of nutritional condition of freshwater fish.

상대 무게 지수(Relative weight index, Wr)는 어류의 표준 무게와 실측 무게의 비율을 산출하는 지수로써 영양상태를 평가하는데 활용된다. 본 연구의 목적은 상대 무게 지수 활용을 위해 국내 담수어류 10종의 표준 무게 산출을 위한 길이-무게 상관관계(표준 LWRs)를 산출하는 것과, 상대 무게 지수 산출 결과에 대한 빈도 분포를 분석하는 것이다. 총 141개 조사 지점에서 798회 어류 채집을 통해 확보한 어류의 길이-무게 데이터를 활용하여 LWRs를 산출하였다. LWRs는 매개변수 a와 b값을 95% 신뢰한계(confidence limits)와 함께 제시하였으며, 모든 종에서 결정계수(r2)는 0.9 이상으로 산출되었고, b값은 Froese (2006)의 예상 범위에 포함되었다. 상대 무게 지수 산출 결과에 대한 빈도 분포 분석은 각 종별로 10~90 백분위수를 10 단위로 산출하여 제시하였으며, 이는 상대 무게 지수를 활용하여 어류의 영양상태를 정량적으로 평가하기 위한 기준으로 활용될 수 있을 것으로 판단된다.

Keywords

References

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