除草剤PCPの浅海水産生物に対する毒性-III : アサリVenerupis philippinarumに対する毒性

概要

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Venerupis philippinarum is a shell-fish of commercial importance along the coastal area in the Ariake sea. The shell-fish are distributed in shallow water bed which is liable to be contaminated with PCP from paddy-fields located along the coast. The toxic effect of PCP to the shell-fish, therefore, was studied by observing the rate of 32P uptake and the survival time on exposing to the test solutions, care being taken of renewing them once a day. One-day culture in sea water containing 32P and varying PCP levels showed an appreciable decrease in the rate of 32P uptake even at a 0.1 ppm level. A marked decrease in the uptake was noted in a concentration range above 0.8 ppm where the shell-fish were observed to close their shells. When the shells were cut as shown in Fig. 1, the toxicity of PCP was found to increase about two times as much as that for the control group with intact shells. It was noticed that under a test condition where one shell-fish was kept in one liter, PCP manifested a higher toxicity than when seven organisms kept in one liter. In the latter case, it was found that the PCP concentration in sea water was decreased sharply during 9 hours, probably due to some detoxication mechanism in the shell-fish. The present toxicity data, therefore, should be checked by keeping the shell-fish in a running PCP solution.