constraints on energy intake in fish the link between diet composition, energy metabolism, and energy intake in rainbow trout限制能量摄入鱼类的饮食成分之间的联系,能量代谢,能量摄入彩虹鳟鱼.pdf

Constraints on Energy Intake in Fish: The Link between Diet Composition, Energy Metabolism, and Energy Intake in Rainbow Trout 1,2 1 2 2 Subramanian Saravanan , Johan W. Schrama , A. Claudia Figueiredo-Silva , Sadasivam J. Kaushik , 1 2 Johan A. J. Verreth , Inge Geurden * 1 Aquaculture and Fisheries Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen University, Wageningen, The Netherlands, 2 Institut National de la ˆ ´ Recherche Agronomique (INRA), UR1067, Nutrition, Metabolism and Aquaculture (NuMeA), Pole d’Hydrobiologie INRA, Saint Pee-sur-Nivelle, France Abstract The hypothesis was tested that fish fed to satiation with iso-energetic diets differing in macronutrient composition will have different digestible energy intakes (DEI) but similar total heat production. Four iso-energetic diets (2 62 factorial design) were formulated having a contrast in i) the ratio of protein to energy (P/E): high (HP/E) vs. low (LP/E) and ii) the type of non- protein energy (NPE) source: fat vs. carbohydrate which were iso-energetically exchanged. Triplicate groups (35 fish/tank) of rainbow trout were hand-fed each diet twice daily to satiation for 6 weeks under non-limiting water oxygen conditions. Feed intake (FI), DEI (kJ kg20.8 d21) and growth (g kg20.8 d21) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P,0.05). Regardless of dietary P/E ratio, the inclusion of carbohydrate compared to fat as main NPE source reduced DEI and growth of trout by ,20%. The diet-induced differences in FI