Growth and Feeding Behaviour of Barbonymus gonionotus (Bleeker,1850) and Hypsibarbus wetmorei (Smith, 1931) in Added-Substrate and No-Added-Substrate Cages
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Abstract
This research was conducted to study the growth and feeding behaviour of two indigenous herbivorous fish species, Barbonymus gonionotus (Bleeker, 1850) and Hypsibarbus wetmorei (Smith, 1931) under different culture systems. Experimental units were composed of net cages with and without substrates, suspended in a nutrient-enriched pond. Bamboo poles with an approximately submerged surface area equal to the total cage surface area were used as substrates for periphyton growth, and were installed vertically inside the net cages. Survival and growth rates of the fish were evaluated after a 56-day rearing period. The results indicated that the provision of substrates to enhance periphyton production in net cages during the early nursing of B. gonionotus and H wetmorei did not improve growth and survival of the fish stocked at 300 fish m-3. B. gonionotus showed a higher growth rate than H wetmorei (p < 0.05). Average yields of B. gonionotus and H wetmorei obtained in cages were 0.32 and 0.22 kg m-3 month-1, respectively.
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References
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