Сравнительная характеристика состояния внутренних органов серебряного карася (Carassius auratus gibelio) в возрастном аспекте

Abstract

The histological results of the study of the organs of larvae and mature individuals of the silver crucian carp Carassius auratus gibelio (Bloch, 1782) caught in the reservoirs of the Volga River delta are presented. Analysis the internal organs state and tissues helps to identify physiological disorders and pathologies. Thanks to the histological method, it becomes possible to study the structure of the body at the cellular and tissue level, to determine the development of the pathological process and the degree of damage. For pathomorphological evaluation, the liver, gills, kidneys, spleen, intestines and pancreas were examined in silver crucian carp of different ages. It was established that representatives of this species of different ages had identical pathological changes in the organs, but the degree of their manifestation was different: there was a tendency to increase the intensity of the pathology with age. 4 types of major pathological changes associated with metabolic disorders, necrotic damage to cells and tissues, circulatory disorders of organs and signs of hyperplasia were found. Sexually mature individuals had a higher level of pathological manifestations. To a greater extent, the gills, which are in direct contact with the environment, were damaged. The liver of the studied fish also had significant damage. The most frequently reported liver pathology was lipoid degeneration (vacuolar degeneration). Kidneys, intestines and spleen were characterized by degenerative and necrotic disorders. In the spleen of adults, granulomatous inflammation was found, which indicates infectious diseases. The same types of morphological changes were found in larvae and mature individuals, which indicates the nonspecific nature of the identified pathologies, which, as a rule, are associated with the adaptation of the organism to the prevailing living conditions.