CYCLIC CHANGES IN GONADAL MATURATION AND HISTOLOGICAL OBSERVATIONS OF THREATENED FRESHWATER CATFISH "NARIKELIRU" MYSTUS MONTANUS (JERDON, 1849)

Background.Usage of biosciences in increasing fish production needs to have a proper understanding and knowledge of endocrine physiology of fish reproduction.The most suitable method of determining the reproductive cycle in fishes is to observe seasonal development changes in the gonads.The present paper describes morphological changes in gonads of