02524naa a2200385 a 450000100080000000500110000800800410001902200140006002400430007410000230011724502150014026000090035552013110036465000170167565000200169265000090171265000150172165000260173665000250176265000300178765000270181765000220184465000100186665000170187665000140189365000290190765000120193665300300194865300180197870000250199670000170202170000190203870000220205777300590207920978702018-12-06       2018    bl uuuu     u00u1 u    #d  a1365-21097 ahttps://doi.org/10.1111/are.137082DOI1 aCAMPECHE, D. F. B.  aDietary proteinblipid ratio changes growth, digestive enzyme activity, metabolic profile and haematological parameters in hybrid surubim (Pseudoplatystoma fasciatum Leiarius marmoratus).h[electronic resource]  c2018  aStudies 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 corruscans 9 Leiarius marmoratus. Juvenile fish (8.90 0.94 g initial weight) were fed 3% of total biomass for 60 days 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  aChymotrypsin  aDietary protein  aFish  aMetabolism  aNutrient availability  aNutrition physiology  aAlimentação Suplementar  aFisiologia Nutricional  aNutrição Animal  aPeixe  aPiscicultura  aProteína  aSistema de Alimentação  aSurubim  aDesempenho de crescimento  aPeixe juvenil1 aANDRADE, D. H. de H.1 aSOUZA, A. M.1 aMELO, J. F. B.1 aBEZERRA, R. de S.  tAquaculture Researchgv. 49, n. 7, p. 2486-2494, 2018.