KODISINGHE, K.A.J.L.2021-03-302021-03-302014UWU/AQT/10/0020http://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/6305/UWULD%20AQT%2010%200020-08052019113237.pdf?sequence=1&isAllowed=yThe 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 fecundityenAquatic Resources Technology Degree Programme ( AQT)Thesis