EFFECTS OF AN HYPOPROTEIC SOYBEAN DIET ON ENERGETIC PARAMETERS AND CONJUGATION REACTIONS IN CARP (CYPRINUS-CARPIO) - TIME-COURSE RESPONSE TO BETA-NAPHTHOFLAVONE

A soybean diet was tested on young carps (Cyprinus carpio) during 8 we eks by comparison to a standard diet. The soybean diet slowed down the fish growth. After 8 weeks, both the mass and glycogen content were d ecreased in liver whereas the lipids increased. At the same time, the glutathione S-transferases (GST) activities increased in the kidney an d erythrocytes. beta-Naphthoflavone (BNF 50 mg/kg) induced GST activit ies after 7 days in the liver of carps fed the two diets, and also in erythrocytes and kidney after 14 days especially in soybean-fed carps. BNF did not affect uridinediphosphoglucuronosyl transferases (UDPGT) activities in liver, kidney and red blood cell of carps fed the two di ets. Therefore, it seems that fish erythrocytes are useful indicators of GST activities.