Comparative analysis of the indices of immunophysiological state in bream (Abramis brama (L.)) from parts of the Rybinsk Reservoir with different extents of pollution

The indices of the cellular and humoral components of natural immunity in bream from parts of the Rybinsk Reservoir with different extents of contamination are studied. Considerable differences were revealed in a range of parameters between the fish sampled in the Sheksninskii reach, which receives waste-waters from the Cherepovets industrial center, and the fish from the relatively unpolluted Molozhskii reach. An analysis of the data shows evidence for the active state of the mechanisms of nonspecific resistance in the fish from polluted sites.