Document Type : Primary Research paper
Four isoproteic (50% crude protein) and isolipidic (10% crude lipid) diets containing four different carbohydrate sources (tapioca, corn, sago and dextrin) at the same inclusion level (20%) were fed to triplicate groups of fish for 67 days. The fish were cultured in 150L fiberglass tanks with 20 individuals/tank. At the end of the feeding trial, growth performance and feed intake of fish fed diets tapioca, corn and sago were better than those fed diet dextrin. Body indices, muscle and liver composition were also affected by the dietary treatments. Sago diet produced fish with significantly higher glucose and lower total protein than other diets. Meanwhile, only mean cell volume and platelet count of blood were affected by the carbohydrate sources. In general, the values of digestibility for dry matter, protein and lipid were considered high in all diets, with significant differences detected among them. In conclusion, all tested starches performed significantly better than dextrin as carbohydrate sources, and the findings of the present study had provided the aquafeed industry with more carbohydrate choices in the formulation of diets for grouper species.