Effects of DDT, BHC and PCB on the Growth of Fish

1. Neither exposure to sublethal level of DDT nor oral administration of sublethal level of DDT inhibited growth of the carp, Cyprinus carpio. 2. Exposure to sublethal level of BHC and oral administration of sublethal level of BHC decreased the conversion efficiency of food in the carp and inhibited the growth in the first two weeks of the experiment. But the conversion efficiency of food was recovered after the first two weeks and the fish grew as control ones. 3. Oral administration of sublethal level of PCB remarkably decreased the conversion efficiency of food and inhibited growth of the goldfish, Carassius auratus .1.DDTの薬浴あるいは経口投与は,致死濃度以下では,コイの摂餌量および餌料効率に影響せず,成長阻害は見られなかつた.2.BHCの薬浴あるいは経口投与は,致死濃度以下では,コイの摂餌量にほとんど影響しなかつたが,実験初期の2週間餌料効率を低下させ成長を阻害した.しかし被験魚はその後回復し,対照魚と同様な成長を示した.3.PCBの経口投与は,致死濃度以下でもキンギョの餌料効率を明らかに低下させ,成長を阻害した