APPARENT NUTRIENT DIGESTIBILITY OF CEREAL GRAIN PRODUCTS FOR TAMBAQUI Colossoma macropomunf

摘要

Carbohydrate-rich ingredients are used in aquafeed industry to reduce costs with diet formulation since carbohydrates are the least expensive energy source. However, differences in carbohydrate utilization among fish species are the main concern whenformulating fish diets. It is well-known among fish nutritionist that carnivorous fish have limited capacity to efficiently use carbohydrates as energy source; while omnivorous/ herbivorous fish may utilize this energy source more efficiently. Apparent digestibility coefficients (ADCs) provide estimates of nutrient availability in feedstuffs and can be used to select ingredients that optimize the nutritional value and cost of formulated diets. Tambaqui, C. macropomum, is one of the most cultured speciesin Brazil and in South America. Although the importance of this species for South American aquaculture, few data are available on nutrient requirement and nutrient digestibility of feedstuffs for Tambaqui. Thus, this study aimed to determine ADCs of drymatter (DM), crude protein (CP) and gross energy (GE) in cereal grain products and by-products for Tambaqui.