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Abstract
This study aimed to evaluate the effects of different feed on the growth and survival rate of goonch catfish (Bagarius rutilus) of 70-500g stage in cage culture at the lower Lo River - Phu Tho. The experimental goonch catfish with initial length of 22.0-23.5cm/individual and weight of 70-72.5g/individual were raised in cages placed on the river, each cage with a volume of 9.0m3. The experiment was arranged with 3 treatments on different feed. Treatment 1 (NT1): Using industrial submersible pellet-feed; Treatment 2 (NT2): Using 100% trash fish and treatment 3 (NT3): Using 70% trash fish and 30% fresh worms, each treatment was triplicated. After 5 months of experimental period, the results showed that goonch catfish obtained the highest growth and survival rate in NT3, followe by NT2 and the lowest in NT1 (p <0.05). In NT3, harvested fish had mean weight of 542.7g/individual, 29.7cm/individual in length and 81.9% survival rate, while in NT1 that were 456.4g/individual and 59.7% survival rate. From the experimental results, it can be concluded that combination of trash fish and earthworms or trash fish are suitable feed for goonch catfish culture, whilst industrial feed used in this study is not suitable.
Keywords: Bagarius rutilus, growth, food, cage culture.