Abstract
Activities of lipoxygenase, catalase, Superoxide dismutase, peroxidase, glutathione reductase, and content of SH-containing substances were determined in erythrocytes and blood serum of some elasmobranch and teleostean fishes of the Black Sea. The enzyme activities and concentrations of low molecular weight scavengers showed marked interspecies differences. Catalase activity in dogfish blood was not detected, while in teleosts, it varied significantly. The highest value of nonprotein serum SH-groups content was noted in dogfish, while in teleost, this parameter was significantly lower ( p < 0.01). The variations of enzyme activities and content of SH-containing substances depend not only upon the taxonomic position of fish species, but also on their ecology. The absence of catalase activity in dogfish erythrocytes may reflect a characteristic feature of elasmobranchs in which this enzyme is compensated for by a high level of nonprotein serum SH-groups, and an elevated concentration of other low molecular weight antioxidants in elasmobranch blood.
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