EFFECT OF HUMAN CHORIONIC GONADOTROPIN HORMONE ON GROWTH AND MATURATION OF ROSY BARB, BARBUS CONCHONIUS (HAMILTON-BUCHANAN)
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Date
2017
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Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Dr.J.Jayalalithaa Fisheries University
Abstract
The Rosy barb, Barbus conchonius belonging to the family cyprinidae is an excellent community fish that has high domestic and export value in ornamental fish trade. The presence of Rosy barbs in the aquarium fascinates the spectator. Voluminous information is available regarding the use of Human chorionic gonadotropin in maturation, but only few works were carried out in ornamental fishes. The present investigation was designed to study the effect of human chorionic gonadotropin hormone on the growth, maturation and spawning of Rosy barb, Barbus conchonius (Hamilton – Buchanan). The HCG hormone (HuCoG 5000 IU) was incorporated into the pellet feed at 100 IU (T1), 300 IU (T2), 700 IU (T3) and 1000 IU (T4) concentrations. The experiment has been carried out for a period of 165 days. The influence of different HCG hormone concentrations on body weight, standard length and specific growth rate were tested and the statistical analysis showed the significant difference at P<0.01 level among the Treatments and Culture period. Mean length gain and per day mean length gain, mean weight gain and per day mean weight gain were found to be high in Treatment 2.
The HCG hormone induced the maturation of Rosy barbs reared in the Treatments as in the following descending order i.e., T2, T3, T4, T1 and control experimental tanks. The maximum values of GSI was observed in Treatment 2 rosy barbs (16.36%) with the Control rosy barbs showing the lowest value (13.13%) in 165 days of culture period. The higher values of fecundity in Rosy barbs were recorded in Treatment 2 (910) with the lower values in Control (837).
Age at first spawning was earlier (142 days) in Treatment 2 followed by Treatment 3 (157 days). The total number of eggs spawned was high in T2 Rosy barbs. High hatchability (95.71%) and high fertilization rate (95.88%) were recorded from Treatment 3 Rosy barbs. The embryonic and larval development of Rosy barb was studied for a period of 26 days till the larva reached to juvenile. The results of the present study infer that 300 IU HCG was the optimum dose to achieve maximum growth, early maturation, high fecundity in Rosy barb, Barbus conchonius.
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