農薬に対する魚類の感受性を比較する方法

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タイトル別名
  • An Analytical Method for Evaluating the Susceptibility of Fish Species to an Agricultural Chemical
  • ノウヤク ニ タイスル ギョルイ ノ カンジュセイ オ ヒカク スル ホウホウ

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1. If the variance of size of test organisms used in the biological assay experiment of chemicals is large, the dosage applied must be corrected corresponding to their size. When the field collected fishes are used for test or the susceptibilities between two fish species are compared, the correction of dosage corresponding to their size must be needed as almost all fishes grow in the same shape for long time.<br>2. “Size factor” for equalizing individual differences in body weight can be calculated by the multiple regression equation that the survival time after immersion was determined as the function of dosage and body weight. If the susceptibilities between two fish species are compared by the regression equation expressed the relation between the survival time after immersion and dosage adjusted for differences in weight, weight factor is expected to eliminate for discussion from the factors affecting the experimental result of fish toxicity test.<br>3. Based on the general idea mentioned above, the comparative test on susceptibility to EI-43, 064 between the goldfish and “Dojo” fish was made by the dipping method. The result has shown that the “Dojo” fish is 5.32 times as susceptible as the goldfish to EI-43, 064. As is seen in the figures of R2's which are the rates explainable the variance in survival time with body weight and dosage are 69.7 and 31.8% in the goldfish and the “Dojo” fish, respectively. It is considered that the variance of “Dojo” fish was much larger than that of the goldfish from the stand point of biological assay.

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