Assessment of a vitamin and mineral premix in an artificial feed for pla duk oui (Clarias macrocephalus) fry
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Clarias macrocephalus fry were reared on two artificial feeds, one with a vitamin and mineral premix and the other without. The fry, 15 day old fish averaging 0.2 grams each, were stocked at the density of 1,000/m2 in fibre glass tanks and were fed at the presumed rate of 5% of their body weight/day. At termination of the trials (33 days) survival in lots fed on food with the premix was 79% and the average size of the fish was 0.65 g. Survival in the opposing treatment was 35.18% and the avera ge size of the fish was 0.48 g. Cost estimates indicated that the diet with the premix could be prepared for about 10ß (US$0.50)/kg and that 1ß (US$0.05) worth of feed would be required to feed 100 fry for 30 days.