The level of indicators of redox status in muscles of fish from lakes with different trophy.
Oxidative stress in fish is the result of the water quality in the ecosystem and the degree of water pollution. The aim of the study was to determine the oxidative potential in the muscles of selected fish species found in lakes with different trophy status. Values of redox indexes (MDA, Vit. C, SOD and CAT) in the muscle tissue of two native (roach (Rutilus rutilus) and perch (Perca fluviatilis)) and one invasive fish species - brown bullhead (Ameiurus nebulosus) were determined. The differences in redox indexes in muscle tissue of fish from lakes with different trophy status were noted. This indicates differentiated sensitivity of individual fish species to oxidative stress resulting from changes in water quality parameters. The changes in the redox parameters in the tissues of selected fish species were more influenced by the lake trophy than the effect resulting from interspecies differences. Fish from a hypertrophic lake had poorer meat quality due to the greater intensity of oxidation processes in relation to fish from the eutrophic lake. The present study gives the need for further studies that will take into account more fish species and a longer period of time, including changes resulting from the functioning of these reservoirs in different seasons.