農薬MEP, Diazinonのクルマエビ,ガザミ幼生に対する急性毒性

概要

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For Penaeus japonicus, the values of 24h TLm of MEP and diazinon at about 25°C decreased with the larval development from the highest values of 1.9ppm and over 20ppm at nauplius stage to the lowest values of (5.0-9.0)×10-4 ppm and (2.0-5.0)×10-2 ppm at post larval stage, respectively. Thereafter, 24h TLm remained almost constant. For Portunus trituberculatus, change of 24h TLm of each pesticide with larval development had a similar pattern to that for Penaeus japonicus. Namely, the value of 24h TLm decreased from zoea I at the first stage just after hatching, to zoea IV or megalopa, having the lowest values of (1.7-5.0)×10-4 ppm on MEP an (4.0-15)×10-3 ppm on diazinon, respectively. Sea water containing each pesticide even at much lower concentration than 24h TLm had the effect of retarding moulting on larvae. Any influence of MEP on the oxygen consumption of larvae of Portunus trituberculatus was hardly detected during 4 hours of immersion even at almost the same concentration as 24h TLm.