The Effects of Ultraviolet Filtration on the Production of the

Goldfish (Carassius auratus) were reared in two recirculating systems initially under the same settings and UV conditions for period of 100 days. Halfway through the experiment, the supply of the UV irradiation in one the setting was discontinued. Several water quality parameters were monitored in both settings at the two different times. The results indicate that UV systems enhanced the growth of the fish, significantly increased the relative growth rate, the production, the survival and the yield of the fish population. Specifically, the ratio of the relative growth rates for the UV to the non-UV treated goldfish was 23:1., production 26:1., survival,1.8:1 and yield 2:1.The condition factors for both populations were not significantly different at 0.9:1 ratio. These findings indicate that there were positive correlation between UV irradiation and most goldfish production parameters.