Carbohydrate changes correlated with the reproductive cycle in male Tilapia, Oreochromis mossambicus (Peters)

Exotic African multiple spawner Tilapia, Oreochromis mossambicus, the reproductive cycle in males is divided into preparatory, prespawning, spawning and postspawning phases, after evaluating the gonadosomatic index and percentage dominance of particular types of spermatogenic stages. Carbohydrates in nervous, endocrine and somatic tissues with respect to the testicular cycle are ascertained by their histochemical demonstration and biochemical estimations. Brain and pituitary has highest carbohydrate in prespawning phase, lowest in postspawning. On the contrary, testis has highest carbohydrate content in spawning, and lowest in the postspawning phase. Liver and muscles show highest carbohydrate in the preparatory and lowest in the spawning phase. A definite co-relation exists in these metabolites in nervous, endocrine, somatic and reproductive components in O. mossambicus.