Utilization of exogenous enzynes in diets for juvenil of cachara (Pseudoplatystoma fasciatum)

• Grant number: 07/00605-9
• Support Opportunities: Regular Research Grants
• Start date: August 01, 2007
• End date: December 31, 2009
• Field of knowledge: Agronomical Sciences - Fishery Resources and Fishery Engineering - Aquaculture
• Principal Investigator: Dalton José Carneiro
• Grantee: Dalton José Carneiro
• Host Institution: Centro de Aquicultura (CAUNESP). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

This research project has been elaborated to evaluate the performance of diets to carnivorous, particularly the one to surubim juveniles (Pseudoplatystoma fasciatum), when the exogenous digestive enzymes amylase and phytase are used. For trhat, digestibility trials will be accomplished with diets containing these two enzymes, separately and jointly, and in different inclusion levels. This study will show which is the necessary enzyme quantity to be added in order to happen an effective improvement over protein digestibility, as well as if there is na interacction between them. The best observed levels for the protein digestibility will be used on a 90-days performance trial. On this study the enzyme levels for amylase, phytase and amylase plus phytase will be used in two kinds of feed with different protein sources, to verify its effect when animal or vegetal protein is used. On this second experiment, animals will have their productive performance evaluated. The fish used on this experiment will also serve to demonstrate if there was any change on the endogenous production of digestive enzymes, by enzymologic and hystologic evaluation; such changes will be observed on the animals´ carcass, mainly in relation to phosphorous, calcium and magnesum retention. These data shall provide important parameters for the comprehension of the performance results and effects of these enzymes over the fish organism. (AU)