Resíduo da castanha da amazônia (bertholletia excelsa) como ingrediente em rações para juvenis de tambaqui (colossoma macropomum)

Abstract

Tambaqui (Colossoma macropomum) is an omnivorous fish, native of the Amazon drain basin and has presented positive commercial value. Rusticity and high productive are characteristics that makes this species interesting for farming. In commercial fish culture, feeding represents about 50 to 70% of the total cost and protein is the most expensive nutrient. Fish meal is the main protein source for fish feed. This cost leads to the use of alternative sources, although anti-nutritional factors limit their inclusion in feeds. The lower protein digestibility is the main limitant factor. This work studied the effect of crescent inclusion levels of Brazil nut meal (Bertholletia excelsa) in feed for juvenile tambaqui. This study was carried out in the CPAq/INPA facilities. 300 juveniles were distributed in 15 plastic boxes in a completely randomized design with four treatments (0,0; 10,0; 20,0; 30,0 % of Brazil nut inclusion) and three replicates each and a treatment to test the ingredient digestibility. Feaces collection method used was a settling water column. Apparent digestibility coefficients of ingredient and rations were higher then expected for all treatments. No significant difference was found for all parameters among treatments, indicating that is possible the inclusion of 30% of Brazil nut meal for feed juvenile tambaqui.