Browsing by Author "KODISINGHE, K.A.J.L."

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    INDUCED BREEDING OF SILVER DOLLAR (Metynnis hypsauchen) USING OVAPRIM
    (Uva Wellassa University of Sri Lanka, 2014) KODISINGHE, K.A.J.L.
    The present study was undertaken to reduce the spawning time period and suggest a reliable breeding method for a continuous production of Silver Dollar. For the experiment healthy and sexually matured brooders in same age were randomly selected and conditioned. Then Ovaprim as a single dose by intramuscular injection at a dosage of 0.2 ml kg-1, 0.3 ml kg-1, 0.4 ml kg-1, 0.5 ml kg-1 and 0.6 ml kg-1 of body weight was administered. The response time was observed as 6.33, 5.66, 9.50, 7.00, and 0.00 hours respectively with 0.2, 0.3, 0.4, 0.5 and 0.6 ml kg-1 of body weight Ovaprim. There was a significant difference (P < 0.05) among the response periods of each dosage. The least spawning time was found with 0.3 ml kg-1 of body weight Ovaprim as 5.66 hours. No response was observed with 0.6 ml kg-1 of body weight Ovaprim Relative fecundity was found to be 4.63, 3.61, 2.19, 5.22, 6.43 and 0.00 respectively with the same doses. Maximum relative fecundity was recorded with 0.5 ml kg-1 of body weight Ovaprim as 6.43. Spawning did not occur with 0.6 ml kg-1 of body weight Ovaprim. The spawning time of natural spawning was observed as 27 days and relative fecundity was 4.63. The post mortality rate of brooders was 0 % after hormone was injected. No significant difference was observed in water quality parameters in experimental tanks (P > 0.05). The results reveal that that Silver dollar can be bred successfully by inducing with Ovaprim. Keywords: Silver dollar, Induced breeding, Response time, Relative fecundity