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The histological changes observed in the pituitary corticotrophs, gonadotrophs, adrenocortical tissues and testicular cells in M. vittatus (Bloch, 1794) have been studies during growth, maturation and spawning phases. The studies based on the changes observed in the cell types, shape and size of the cells of the adrenocortical tissues, testes and the overall percentage of gonadotroph (GTH) and thyrotroph (TSH) cells of the pituitary. However, during growth phase, in proximal pars distalis (PPD) the considerable increment of GTH and TSH have been observed having intense aniline blue stain. The corticotrophs (ACTH) also showed significant accumulation of fuchsinophilic cytoplasmic granules. The cytoplasmic features and the architecture of the interrenal cells were well coincident with the increase of different spermatogenic cells. During the maturation phase dense granulation in the GTH and TSH cells appeared to be concomitant with the spermiation. The amount of cytoplasmic granules of the interrenal cells increased than chromaffin cells and was well coincidence with the increase of spermatids and spermatozoa. The hyperactive and vacuolated features of the interrenal cells during spawning phase appeared to be concomitant with the final process of spermiation.

.P. (1973): Studies on the helminth parasites of freshwater fishes of Uganda including the descriptions of two new species of digeneans. Rev. Zool. Bot. Afr ., 87(2): 209 – 248 K umar , R., A garwal , G.P. (1980): Oudhia hardayali n. sp. from the intestine of a fresh water fish, Mystus vittatus (Bl). Proc. Indian Acad. Parasitol. , 1(2): 41 – 42 L ooss , A. (1899): Weitere Beiträge zur Kenntnis der Trematoden- fauna Aegyptens, zugleich Versuch einer natürlichen Gliederung des Genus Distomum Retzius [Further contributions to the knowledge of the trematode fauna of

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