Dietary protein:lipid ratio changes growth, digestive enzyme activity, metabolic profile and haematological parameters in hybrid surubim (Pseudoplatystoma fasciatumxLeiarius marmoratus)

作者：Bacconi Campeche Daniela Ferraz; de Holanda Andrade Douglas Henrique; de Souza Anderson Miranda; Bibiano Melo Jose Fernando; Bezerra Ranilson de Souza

来源：Aquaculture Research, 2018, 49(7): 2486-2494.

DOI：10.1111/are.13708

• carnivorous fish
• chymotrypsin
• intermediary metabolism
• nutrient efficiency
• physiology

Studies investigating improved protein:lipid ratios based on their effects on growth, nutrient utilization, digestive enzyme activities, blood metabolites and erythogram in tropical carnivorous fish are very scarce. This study evaluated the effect of different protein:lipid ratios on these parameters in the hybrid surubim Pseudoplatystoma corruscansxLeiarius marmoratus. Juvenile fish (8.90 +/- 0.94g initial weight) were fed 3% of total biomass for 60days using four isoenergetic experimental diets with different protein:lipid ratios (9.00, 4.60, 3.54 and 1.78). Higher growth performance parameters were observed at higher protein:lipid ratios. The activities of intestine total alkaline protease, trypsin and lipase (U/mg protein) were not affected by dietary treatments. Chymotrypsin (U/mg protein) was higher in the 4.60 protein:lipid ratio group. Amylase (U/mg protein) was higher in intermediate groups. Blood glucose, total plasma protein, triglycerides, cholesterol and free amino acids decreased as the protein:lipid ratio decreased. Haematocrit was higher at the 9.00 and 4.60 protein:lipid ratios. Hybrid surubim showed metabolic adaptation to the different protein:lipid ratios tested. These results suggest that the 4.60 protein:lipid ratio showed the best protein-sparing effect of lipids.

• 出版日期2018-7