Browsing by Author "Abeysinghe, A.H.M.S.S.K."

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    Induced breeding of Silver Dollar (Metynnis hypsauchen) using ovaprim
    (Uva Wellassa University of Sri Lanka, 2015) Kodisinghe, K.A.J.L.; Jayamanne, S.C.; Abeysinghe, A.H.M.S.S.K.
    Production of ornamental fish is a rapidly growing sector of the aquaculture industry (Tlusty, 2001). Among the ornamental fish production in Sri Lanka, exotic ornamental fishes have a significant demand in the market.Silver Dollar (Metynnishypsauchen) which was originated from South America is such kind of exotic ornamental fish in Sri Lanka that a higher demand has been achieved. Silver Dollar is not breeding very often in Sri Lankasince it takes a longer spawning period. To avoid that problem, the fish can be bred artificially. Among all the artificial breeding methods, induced breeding by hormone administration is the most reliable method (Yanong, et al., 2013). In this study attempts were made to develop induced breeding of Silver Dollar (Metynnis hypsauchen) in Sri Lankan environmentusing inducing hormone “Ovaprim”. Materials and method Sexually matured and healthy Silver Dollar brooders were selected based on the external features. Eighteen pairs in same age were randomly collected and conditioned. Then Ovaprim as a single dose and 0.6 mlkg of body weight was administered to the brooders. Natural spawningwas also allowed without inducing by Ovaprim as a control. After the hormonal injection, the best range of Ovaprim dose to have least response time and better breeding performance of Silver Dollar was determined based on response time (hours). Relative fecundity, post mortality rate of brooders and water quality parameters in experimental tanks were also monitored.Data analysis was done by one way ANOVA and Tukey test. Results and Discussion The effects of different doses on the breeding performance of Silver Dollar are shown in Table 1.Salmon gonadotropin releasing hormone analogue sGnRHa (Ovaprim) successfully induced spawning in Silver Dollar (Metynnis hypsauchen). Five different Ovaprim doses supported the spawning activity and the breeding performance was favored by lower and middle inclusion level of Ovaprim dose in the experiment. Ovaprim is a well-known commercial spawning aid which is mostly used in induced breeding of fish (Anonymous, 2012). It has been used in successful manner for several fish families (Hill et al., 2005). In the present study,all the brooders spawned, except the brooders which were injected with 0.6 ml