The experimental feeding was carried out during 2010 in the wet lab. of Central Laboratory for Aquaculture Research, Abbassa, Abo Hammad, Sharqia Governorate, Egypt. The study aimed to investigate the effect of dietary graded levels of Super Biobuds and Bioyeast on the performance, feed utilization, blood constituents, and body composition, of catfish (Clarias graiepinus) fingerlings.
Channel Catfish Habitat Use and Diet in the Middle ..
There is a large body of evidence that a 28%- protein diet provides essentially the same growth and feed efficiency as higher protein diets for pond-raised channel catfish (Li and Lovell 1992; Robinson and Li 1997; Robinson et al. 2004). However, blue catfish appear to require 32% protein for optimum growth (Li et al. 2008). Commercial hybrid catfish raised from advanced fingerlings to market size have been typically fed the same diet as channel catfish, either 28% or 32% protein. Results from Experiment 1 show that hybrid catfish have a protein requirement similar to that of channel catfish. There were no significant differences in total feed fed, net yield, weight gain, feed conversion ratio (FCR), or survival among fish fed diets containing 28%, 32%, or 36% protein (Table 4). There were also no significant differences in carcass yield, fillet protein, and moisture among fish fed various diets (Table 5). However, fish fed the 36%- protein diet had a higher fillet yield and lower fillet fat than fish fed the 28%-protein diet. Fish fed the 32%-protein diet had intermediate fillet yield, which was not significantly different from that of fish fed the 28%- or 36%- protein diets. Fish fed the 28%- and 32%-protein diets had similar fillet fat levels. These results agree well with data reported for channel catfish (Li and Lovell 1992; Robinson et al. 2004), which demonstrated that 28% protein is sufficient for optimum growth and feed efficiency. As with channel catfish, the body fat level in hybrid catfish is generally reduced and processed yield is improved as dietary protein levels increase and digestible energy to protein (DE:P) ratios decrease. This is because as dietary protein increases, the dietary DE:P ratio becomes optimized. However, using high-protein diets to reduce body fattiness and improve processed yield may not be economical for the catfish producer.
Cheat Lake Channel Catfish Age, Growth, and Diet
Soybean meal has been the main protein source, and corn has been the primary energy source used in catfish diets. However, prices for these traditional dietary ingredients have increased dramatically in recent years. Thus, there has been considerable interest in finding less expensive, alternative feedstuffs for use in catfish diets. Corn gluten feed — a by-product of corn milling — and cottonseed meal are currently competitively priced compared with soybean meal and corn. Use of a combination of these two ingredients would reduce feed cost for catfish production. Results from Experiment 2 showed that corn gluten feed at levels up to 30% of the diet and that a combination of corn gluten feed and cottonseed meal up to 25% each did not affect feed consumption, net yield, weight gain, FCR, survival, or fillet proximate nutrient composition (Tables 6 and 7). However, a combination of corn gluten feed and cottonseed meal at 20% or more each reduced carcass yield of the fish. Similar results have been reported previously for channel catfish (Li et al. 2011). It is not clear why processed yield is reduced in catfish fed diets containing relatively high levels of corn gluten feed and cottonseed meal. Possible contributing factors include lower digestible protein, higher fiber concentrations, and lower and imbalanced essential amino acids in these plant feedstuffs.
Delta Catfish Diet in Yazoo City, MS - (662) 528-4..