Toxicity of PCP for the “Dojo” fish, <i>Misgurnus anguillicaudatus</i> (CANTOR), with special reference to the relation between concentration and immersion time

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  • ドジョウに対するPCPの毒性,とくに濃度と浸漬時間の関係
  • ドジョウ ニ タイスル PCP ノ ドクセイ , トクニ ノウド ト シンシ ジカン ノ カンケイ サカナ ドク シケン ニ カンスル ケンキュウ 5
  • Studies on the biological assay of chemicals in fishes. V.

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In this paper, the toxicity of PCP-Na for the “Dojo” fish was discussed through results obtained by a regression method, taking into consideration the immersion time of the fish and the concentrations of the testing solution. The fish ranged from 0.4 to 12.7g in weight. Their weights were determined by taking the difference in weight of a vial with testing solution and the same vial with solution and a fish. Data on dead or alive were recorded individually. Immersion time in the testing solution was controlled by washing the whole test vial, including the fish, in running water. From the data of 87 combinations of concentrations (ppm) per weight (g) of fish C and time of immersion T (min.), together with indications of whether or not the fish responded, an equation for fitting a probit regression plane was estimated as: Y=-5.1725+3.3485x1+5.6678x2. Here x1 and x2 are logC and logT respectively and Y is the probit probability of response P. Results of the χ2 test showed no significant difference between the empirical probits and the predictions from the fitted equation. The 5% fiducial limit curves (t=1.96) for P=0.5 and 0.9 were calculated and were shown in the figures.

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