HISTOLOGICAL CHANGES IN PITUITARY GONADOTROPHIC HORMONE CELLS IN RELATION TO SEASONAL CHANGES IN OVARIES OF THE FISH ORIEOCHROMIS MOSSAMBICUS

An attempt was made to study the correlation of pituitary gonadotrophs (GTH) with the simultaneous changes in the ovaries throughout the year. The pituitary and ovary  of  the  same  fishes  were  prepared for  the  histological studies. According to gonadosomatic  indices (GSI) and  histological  position  ovarian  development was  categorized  in  three  phases, 1. recrudesence (Dec-April) 2. Spawning (May-July) and Quiescent (Sep-Nov). The pituitary GTH-cells during recrudescent period were small in size and granulated. Degranulation was noticed at the time of spawning  when  ovary  filled with mature follicles. Chromophobic condition was observed at the time of quiescent period.

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