Revisiting the morphofunctional state of the organs of wels catfish (Silurus glanis L.)

Abstract

The state of the organs of wels catfish (Silurus glanis) caught in the Volga-Caspian fishery region have been analyzed. Destructive processes in the gill apparatus manifested in the changes of the epithelium of filaments and lamellae. Signs of hemosiderosis were found in the spleen. Necrotic areas and signs of fatty degeneration were found in the liver. Pathologies were observed in the stomach and intestines, manifested by edema and desquamation of the epithelium. All examined organs were characterized by signs of impaired blood microcirculation. The pathomorphological studies indicated the response of the fish organism to the environmental conditions. The revealed pathological signs served as red flags of nonspecific adaptation taking place at the cellular and tissue levels. Such responses allowed the fish to adapt and survive in the prevailing environmental conditions.

Keywords

• inflammatory process
• hyperplasia
• hypertrophy
• histological structure
• histopathology
• volga river delta
• gill apparatus
• parenchymal organs