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Seasonal histological changes in the ovaries of a mountain stream teleost, Schizothorax richardsonii (Gray and Hard).

In S. richardsonii, unlike its testis, the whole of the ovary is fertile. The oogonia pass through seven maturation stages to form the ripe ova. The residual oogonia are responsible for the development of the new crop of oogonia. The zonation of the ooplasm reveals that a majority of the oocytes have a darkly stained inner and a lightly stained outer zone. The yolk nucleus probably has some relationship with the process of vitellogenesis. The nucleoli are produced by the division and fragmentation of the nucleolus. Extrusion of nucleoli appears to be associated with the formation of yolk. The formation of yolk globules in the oocyte begins in the periphery of the ooplasm and moves inward till the whole of the ooplasm in impregnated with yolk. As the yolk vesicles are PAS-positive in this fish, they contain mucopolysaccharides. The ovarian cycle can be divided into five stages. The ovary becomes much enlarged and distended in the month of October and delicate and thin in March. The spawning season extends from late October to December and the ovary exhibits asynchronism.