Investigations of pesticide residues in fish and other aquatic organisms of Lake Balaton and some other aquatic habitats

Baron, Ferenc and Csonti, Ferenc and Ponyi, Jenő (1967) Investigations of pesticide residues in fish and other aquatic organisms of Lake Balaton and some other aquatic habitats. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 34. pp. 117-128. ISSN 0365-3005

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Abstract

The authors have determined by thin-layer chromatography the content of pesticide residues of fish originating from different bodies of water (Lake Balaton, the Danube-reach in Comitat Tolna, various fish ponds) as well as those of some other aquatic organisms. Of the demonstrated residue components, the highest amounts are represented by DDT and its decomposition substances, DDE, µ-HCH, and an unknown factor. Among the fish species originating from various localities, it was only the pike-perch which showed slight differences as to the quantity of sprayresidues. It seems that there evolved an approximately identical level of sprayresidues in fish deriving also from waters beyond those of Lake Balaton. On the other hand, there was a sharp difference found between the raptorial fish species (pike-perch, pike) and the carp of the same water area (with respect to Lake Balaton and the Danube-reach in Comitat Tolna). Fish-ponds represent an exception, insofar as corresponding and low values have been demonstrated in both the pike-perch and the carp. Among the organs and tissues, respectively, of the several fish species, fatty tissues contain the highest amount of pesticide residues, followed by the liver — in some cases the roe — and meat. The DDT content of the Crustacean plankton of the Lake Balaton is highly significant (0.13 mg/kg), especially in view of its role in the food-chain. Data obtained from samples similar in composition of the years 1965 and 1967 show that the pesticide level of the bream had increased, while the values referring to the pike-perch and the carp remained within the order of magnitude of the previous data.

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