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Research Paper | Zoology | India | Volume 12 Issue 11, November 2023 | Rating: 4.8 / 10
Annual Reproductive Cycle of Male Indian Minor Carp Labeobata (Hamilton, 1822)
Kousik Roy | Dipak Kumar Mandal
Abstract: The histological observations of the testis of a minor carp, Labeobata exhibited the annual reproductive events of its testicular function. The gonadosomatic index (GSI) value reached peak in the month of June at the onset of breeding period in their annual reproductive cycle. GSI increased with the proliferation of spermatids and spermatozoa in male fish and decreased sharply during post spawning phase with the release of spermatozoa. The histology of testes revealed five different types of germ cells which are spermatogonia, primary spermatocyte, secondary spermatocyte, spermatids and spermatozoa. Annual reproductive cycle of this fish is divided into five distinct phases such as resting, preparatory, pre spawning, spawning and post spawning phase on the basis of GSI and histological condition of the testes. The spermatogonia are dominated cell types in the resting and preparatory phase but spermatozoa are major cell types during pre - spawning and spawning phase. This study represented that Labeobata is an annual breeder and the testis reached peak maturity at the time of monsoon months, June - July. Number and size of the interstitial cells increased during pre - spawning and early spawning phases indicating their highest activities of gonad. The spermatogenic activities decreased in the post - spawning phase due to release of spermatozoa.
Keywords: Reproductive cycle, Testis, GSI, Histology, Labeobata
Edition: Volume 12 Issue 11, November 2023,
Pages: 192 - 196