Features of formation of the hypophysis of the ovulatory wave in gonadotropin in gonadotropocytes during artificial reproduction of fish with high fecundity

About the author:

Alexander B. Burlakov, Dr. Sci. (Biol.), Professor, Leading Researcher, Ichthyology Department, Lomonosov Moscow State University

Abstract:

Investigations on the state of the central and peripheral gonadotropocytes of the hypophysis of silver carp´s females Hypophthalmichthys molitrix (Val.) at the light and electronic-microscopic levels, following the stimulation of maturation with the chorionic gonadotropin, showed that the amount of secretory material diminishes in both types of cells. The area of gonadotropic cells (GTC) and their nuclei, as well as their workload secretory content, was significantly reduced for the fish with spawn eggs of high fishing quality (80-95% fertilization). There is an intensive decrease of both secretory granules and content of cisterns of the granular endoplasmic reticulum. By contrast, mass secretion of endogenous gonadotropic hormone (GTG) from the cells does not occur in the case of fish producing eggs of low fish quality (5-10% fertilization). As for females of the latter type GTG secretion from the GTC-type holocrine is not observed. By the hypophysis the formation of the ovulatory wave of gonadotropin for females with different fecundity takes place differently due to the change of correlation of mero- and holocrine secretion processes.

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