There was an overall trend toward lower processing yields for fish fed alternative diets with CGF (table 5). However, only visceral fat was significantly lower in catfish fed the alternative diets (table 5). Reduced body fat has been observed previously in catfish fed diets with CGF (Robinson et al.,2001). Dry matter and energy digestibility of corn gluten feed in catfish is low (Kitagima and Fracalossi,2011;Li et al.,in press). Pertly because of its indigestible fiber content. High-fiber ingredients in the diet (Amirkolaie et al.,2005;Lekva et al.2010). However, the total dietary fiber was only 1% higher in the alternative diets with CGF, and total fiber in all diets was below the maximum recommended level of 7% for least-cost formulation (Robinson and Li, 2005).