Oxygen Consumption Constrains Food Intake in Fish Fed Diets Varying in Essential Amino Acid Composition

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

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)

Abstract

Compromisation of food intake when confronted with diets deficient in essential amino acids is a common response of fish and other animals, but the underlying physiological factors are poorly understood. We hypothesize that oxygen consumption of fish is a possible physiological factor constraining food intake. To verify, we assessed the food intake and oxygen consumption of rainbow trout fed to satiation with diets which differed in essential amino acid (methionine and lysine) compositions: a balanced vs. an imbalanced amino acid diet. Both diets were tested at two water oxygen levels: hypoxia vs. normoxia. Trout consumed 29% less food under hypoxia compared to normoxia (p0.05). This difference in food intake between diets under normoxia together with the identical oxygen consumption supports the hypothesis that food intake in fish can be constrained by a set-point value of oxygen consumption, as seen here on a six-week time scale.
Original languageEnglish
Article numbere72757
Number of pages7
JournalPLoS ONE
Volume8
Issue number8
DOIs
Publication statusPublished - 2013

Keywords

  • trout oncorhynchus-mykiss
  • european sea bass
  • rainbow-trout
  • dissolved-oxygen
  • nile tilapia
  • feed-intake
  • oreochromis-niloticus
  • salmo-gairdneri
  • self-selection
  • protein

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