Reproductive profile of male Labeo dyocheilus in relation to age under captive conditions in tarai region of Uttaranchal
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Date
2004-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was carried out at Instructional Fish Farm of the College of Fisheries, Pantnagar. It included the study of correlation of environmental factors and histophysiological changes in testis and liver pertaining to the initiation of spermatiogenic proliferation leading to success of spermatogenesis and onset of 1st gametic maturity (puberty) in male specimens of 1st and 2nd year of age of cold water adapted species of commercial importance, Labeo dyocheilus, under captivity conditions in Tarai region of Uttaranchal. The parameters used for envisaged correlations included the evaluation of GSI, HSI, CF and SCF and gross-morpho-histophysiological observation in testis and associated changes in liver. The testicular development is positively correlated with prevailing photothermal profile and to some extent rainfall. GSI showed inverse correlation with HSI. Correspondingly the onset of 1st gametic maturity probably initiates by the 4th part of 1st year life spawn of the young ones and completes successfully at the age of approximately two years. Responsiveness of gametic maturity to exogenous administration of ovaprim was of superior level in twice/week treated group as compared with once/week treated and control groups but with of high significance in relation to generalized events of spermatogenesis in 1st year age group and to terminal events, spermiogenesis, in 2nd year age group thus inferring the efficacy of ovaprim to be also used as gametic maturity inducing hormone.
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