Thumbnail Image

Theses

Browse

20042
Reset filters
Subject: Fish Genetics and Breeding × End date: 2004 × Start date: 2004 × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    Reproductive profile of male Labeo dyocheilus in relation to age under captive conditions in tarai region of Uttaranchal
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2004-07) Ranjana; Ram, R.N.
    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.
  • Thumbnail Image
    ThesisItemOpen Access
    First maturity and ovarian recrudescence in female Labeo dyocheilus in captivity in tarai region of Uttaranchal
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2004-07) Yadav, Vinod Kumar; Singh, I.J.
    The present study was conducted to assess age for the onset of 1st maturity and gonadal development in female L. dyocheilus and its responses to exogenous hormonal administration for stimulation of ovarian maturity during active reproductive phase. The assessment of age at 1st maturity and ovarian development incorporated macroscopic and microscopic observations of ovary with correlative changes in liver in -1 and +1 year old specimens of L. dyocheilus produced and reared under captivity in Tarai region of Uttaranchal and its correlation with environments changes. The macroscopic parameters used in this work included 1st appearance of gonad, its location, shape, colour etc and indices like GSI, HSI, CF and SCF, while microscopic observations included gross morpho-histophysiolical observations of ovary and associated change in liver in both age groups. Above parameters were also used for evaluating responsiveness of ovary in specimens of both age groups to exogenous hormone i.e. ovaprim. In -1 year old specimen the ovary became visible to naked eye for the first time in March as paired organ at postero-dorsal location in coelomic cavity. The ovary was visible throughout the year in +1 year old specimens. The increasing GSI and correlative decreasing HSI during active reproductive phase, though insignificant, was indicative of their inverse relationship. GSI and ovarian histophysiological changes indicated that after one stage progression to subsequent maturity was not attained. The ovarian development showed a positive correlation with increasing ambient day-length and temperature. The responsiveness of gametic maturity in response to ovaprim better treatment was in twice/week treated group as compared with once/week one and control. It accelerated developmental stages in 1st year age group and terminal maturational events and gonadal development in 2nd year age group. On the basis of these observations it could be inferred that ovaprim has potential use as gametic development and maturity inducing hormone but might need appropriate delivery system for sustained action.