Effect of protein levels on the growth performance of fingerling african catfish (Clarias gariepinus)
1998
Pichit Punsri | Kasame Chetawan | Thongyoon Thongklongsai | Prapatsri Punsri
Study was designed to determine the effect of protein levels on the optimum growth rate of Fingerling African Catfish. Five groups of sixty fish each were sampled, reared in a concrete pond and fed on five experimental diets: 30 percent, 35 percent, 40 percent, 45 percent and 50 percent crude protein levels. Fish was given experimental diet with air dry weight at the rate of 10 percent of body weight per day. Body weight gain (BWG) and total lenght (TL) of fish at 8 - week old were increasing as high as the level of crude protein added in the diets. BWG and TL fed with 50 percent crude protein level were significantly different from other treatments (P0.01). BWG and TL of both 10 - week and 12 - week old fish were increasing at the highest rate among fish fed on diet with 40 percent (P0.01). There were no significant differences in survival rate (SR) of 8 - week and 10 - week old fish for all treatments, while the SR of 12 - week old fish with the 30 percent and 35 percent was significantly different from those with 45 percent and 50 percent (P0.01). Better feed conversion ratio (FCR) for the fish at 8 - week old fish was observed with experimental fish given diet with 50 percent whereas better FCR for the fish at 10 - week and 12 - week old fish were observed at the 40 percent. The results showed that the dietary protein level at 50 percent was the optimum level for maximal growth rate of Fingerling African Catfish during 1-8 - week old. The suitable protein requirement for maximal growth rate of Fingerling African Catfish at the age of 10 and 12 weeks should be 40 percent crude protein level in the diet.
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