Data on the diversity and occurrence of anomalies in the development of the axial skeleton are presented for juveniles of six cyprinid fish species of Saratov Reservoir: roach Linnaeus, 1758, bleak Linnaeus, 1758, ide Linnaeus, 1758, bream Linnaeus, 1758, rudd Linnaeus, 1758, and white bream Linnaeus, 1758. In total, 4 main types of axial skeletal abnormalities of varying severity and localization were diagnosed: scoliosis, lordosis, kyphosis, and underdevelopment of the caudal spine. The proportion of individuals with spinal disorders ranged from 0.5 in bream to 2.3% in bleak. The proportion of axial skeletal anomalies among other detected disorders ranged from 2.0 in bream to 9.9% in bleak, while the total proportion of abnormal individuals in the studied samples varied from 23.4 to 38.4%. There is a tendency of increasing the frequency of occurrence of axial skeleton anomalies in fish fry of the Saratov Reservoir with an increase of the anthropogenic load at different stations of the Reservoir.
A.K. Mineev (Wed,) studied this question.