Abstract
The present study describes the process and characteristic features of oocyte resorption throughout its developmental stages in T. chalcogramma (Pallas, 1814). Histological methods revealed two major resorption pathways: follicular and follicular-histiocytic atresia. Degeneration of oocytes in early stages of development occurs with the participation of follicular cells, whilst late developmental stages are characterized by both follicular and histiocyte cell involvement. As in other species of fish, oocyte resorption in T. chalcogramma serves the function of fecundity regulation and should be regarded as a normal physiological response to environmental or anthropogenic factors.
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