Comparison between natural feeding alone and supplemental feeding with pellets containing locally available ingredients for cage culture of Oreochromis niloticus in Thale Noi, Thailand
1988
Chiayvareesajja, S. | Sirikul, B. | Sirimontraporn, P. | Pakkeaw, S. | Tansakul, R. (Prince of Songkla Univ. Haad Yai, Songkla (Thailand). Dept. of Aquatic Science)
Nile tilapia (Oreochromis niloticus) was chosen as a suitable fish for cage culture in Thale Noi [Thailand], a slightly acidic lagoon in upper Songkhla Lake, Thailand. It was reared in 1-cubic meter cages with 35 fish/cage from April to September 1984. There were twelve feeding treatments, varying the composition of feed pellets. The ingredients were dry and fresh aquatic weed (Ceratophyllum demersum), concentrated pig feed, fish meal, cassava starch and chicken pellet mix, with three replications for each treatment. The fish were fed at 5% of body weight/day for 5 months. Survival for all treatments ranged from 90 to 99%. Mean initial weight of the fish ranged from 11.7 to 18.5 g. The best growth was obtained from the fish fed on chicken pellets alone: average percentage weight gain, 638%. Control fish with no feeding exhibited better growth than some fish fed on pellets containing C. demersum. Feed conversion ratios were not significantly different and ranged from 3.87 to 4.38. Rearing tilapia in 1 cubic meter cages in Thale Noi is therefore possible without supplemental feeding at present.
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