Comparative analysis of oocyte growth in two forms of Baikal grayling Thymallus baicalensis (Thymallidae)

Abstract

Size characteristics of oocytes of the elder generation of the end of previtollogenesis, as well as of the beginning and middle of the phase of cytoplasm vacuolization in two forms of Baikal grayling Thymallus baicalensis were studied. In each form, the dependence of oocyte parameter on the age and size of females is traced. During the studied phases of development—at the termination of the period of previtellogenesis and at the proper beginning of the period of vitellogenesis—oocytes of the white and black graylings have similar sizes; cytoplasm vacuolization in white grayling proceeds less actively. It was established that differences in the diameter of mature ovicells in the black and white Baikal graylings result from dissimilar rate of accumulation of trophic substances in the oocytes of the given forms of this species and are determined by differences in the rate of growth of oocytes during the formation in them of yolk inclusions.

DOI: 10.1134/S0032945210070052

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Cite this paper

@article{Zaitseva2010ComparativeAO, title={Comparative analysis of oocyte growth in two forms of Baikal grayling Thymallus baicalensis (Thymallidae)}, author={Andrei Zaitseva and N. S. Smirnova-Zalumi and Natalia I. Zakharova}, journal={Journal of Ichthyology}, year={2010}, volume={50}, pages={536-542} }