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Subject: Aquaculture × Author: BHARGAV, × Start date: 2017 ×
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    ThesisItemOpen Access
    MANIPULATION OF SEX IN DWARF GOURAMI, TRICHOGASTER LALIUS (HAMILTON, 1822
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2019-08) BHARGAV,; Basawaraj
    Trichogaster lalius, commonly known as dwarf gourami, is a very popular ornamental fish, adored by aquarists due to their striking coloration and docile nature. Flame red dwarf gourami, which is a color morph developed from dwarf gourami through selective breeding. In view of the growing concern over use of synthetic hormones for sex manipulation, the present study was conducted with the aim of introducing an eco-friendly, plant-derived aromatase inhibitor, Proanthocyanidin (from grape seed extract), for sex manupilation through discrete immersion treatment at different doses of Proanthocyanidin, i.e. 500, 750, 1000 and 1250 μg/l for 3 h daily on third, fifth and eighth day after hatching, along with 17α-MT at 1000 μg/l, as a positive control. In T. lalius, the highest percentage of males (60.75%) and the highest post treatment survival (90.80%) were obtained at 1250 μg/l Proanthocyanidin treatment, whereas in positive control (17α-MT), 87.20% post-treatment survival and 80.62% males were observed with 12.90% fin deformity. In the flame red dwarf gourami, highest proportion of males (72.15%) was obtained at 1250 μg/l and the highest post-treatment survival (94.02%) was obtained at 750 μg/l of Proanthocyanidin. In positive control, 82.45% males and 93.44% post treatment survival were observed. The female GSI of the Proanthocayanidin treated fish and positive control group revealed significant suppression of the ovarian development compared to control in both the strains. Histological examination showed the appearance of suppressed atretic oocytes and more immature oocytes in positive and Proanthocyanidin treatment (1250 μg/l) groups. No significant difference was observed in total body carotenoid content in Proanthocyanidin-treated and control groups in dwarf gourami. In the flame red strain a significant difference was found between Proanthocyanidin treatment, positive and negative control groups, but no significant difference was found among Proanthocayanidin treatment groups.