Constraints on Energy Intake in Fish: The Link between Diet Composition, Energy Metabolism, and Energy Intake in Rainbow Trout

S. Subramanian, J.W. Schrama, A.C. Figueiredo-Silva, S.J. Kaushik, J.A.J. Verreth, I. Geurden

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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 (2×2 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 kg-0.8 d-1) and growth (g kg-0.8 d-1) of trout were affected by the interaction between P/E ratio and NPE source of the diet (P0.05). Our data suggest that the control of DEI in trout might be a function of heat production, which in turn might reflect a physiological limit related with oxidative metabolism.
Original languageEnglish
Article numbere34743
JournalPLoS ONE
Issue number4
Publication statusPublished - 2012



  • european sea-bass
  • voluntary feed-intake
  • salmon salmo-salar
  • oncorhynchus-mykiss
  • food-intake
  • digestible energy
  • growing-pigs
  • utilization efficiency
  • oreochromis-niloticus
  • dicentrarchus-labrax

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