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

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 rati...

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Bibliographic Details
Published in:PLoS ONE
Main Authors: Subramanian, S., Schrama, J.W., Figueiredo-Silva, A.C., Kaushik, S.J., Verreth, J.A.J., Geurden, I.
Format: Article in Journal/Newspaper
Language:English
Published: 2012
Subjects:
dicentrarchus-labrax
digestible energy
european sea-bass
food-intake
growing-pigs
oncorhynchus-mykiss
oreochromis-niloticus
salmon salmo-salar
utilization efficiency
voluntary feed-intake
Salmo salar
Online Access:https://research.wur.nl/en/publications/constraints-on-energy-intake-in-fish-the-link-between-diet-compos
https://doi.org/10.1371/journal.pone.0034743
Description
Summary: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.

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