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Seasonal variations in the Ovaries of some teleosts in respect to their gono-somatic index and fecundity

: Observations on seasonal variations and oocyte development in the teleost species ( Labeo rohita, Anabas testudineus and Mastacembelus armatus ) were done for a complete year from January 2019 to December 2019. In all the species six stages via immature, developing, early maturing, ripening, mature-gravid and spent were identified on the basis of oocyte development. Protocol for the preparation of paraffin blocks were followed during the observation. Histological slides were prepared and histological observations were carried out. Simultaneously attempt has been made to study their gono-somatic index and fecundity. Results showed that all the selected species are unisexual and with paired ovaries joined by a short oviduct opening outside with a minite aperture. Ovaries were seen under fully developed in between June to August, empty in between September to December and active in between January to May .Their gono-somatic index were maximum in the month of June to August confirming their spawning stage. Absolute fecundity also determined in June to August was maximum in all the species indicating its direct correlation with gono-somatic index. Environmental