[Drug residues in food fish].

The present paper reviews different possibilities of pharmacolegal residues in fish. Sometimes the treatment of fish with registered drugs in therapeutical dosage is provable in spite of keeping the withdrawal time. To that experiences of the persistence and values of Chloramphenicol, Chlortetracycline and Furazolidone proved after therapeutical treatment in fish correlated to the water temperature are compared with results of experiments documented in literature. Investigations on the residues of Enrofloxacin after application of different doses to rainbow trout were carried out. Sometimes the proof of drug residues in fish can be done without an advanced treatment. The recontamination of fish with drugs or their metabolites in environment is discussed as a possibility for drug residues. The carry-over-effect of drug during the animal food production can be also the reason for residues in fish. Experiments with Chloramphenicol contaminated feed in rainbow trout show residues in muscle of fish higher than 10 ppb during the feeding period. Finally the results of residues different drug used in fish--given in literature--are collected in two tables.