Fish Physiology and Biochemistry

, Volume 14, Issue 2, pp 153–164 | Cite as

Effect of feeding on the tissue free amino acid concentrations in rainbow trout (Oncorhynchus mykiss Walbaum)

  • C. G. Carter
  • Z-Y. He
  • D. F. Houlihan
  • I. D. McCarthy
  • I. Davidson
Article

Abstract

This study investigates whether tissue free amino acid (FAA) pools in rainbow trout,Oncorhynchus mykiss (Walbaum), are altered following feeding and the relationships between the amount of food consumed and the FAA pool size. Trout were starved for 7 days to provide baseline data and then refed on day 8. Individual food intake was measured by radiography and the consumption of amino acids (AA) calculated from dietary protein consumption. Total FAA concentrations in the stomach, liver and white muscle were little changed at various times after the meal and this pattern was repeated for the majority of individual FAA. Overall, the most notable change was a reduction in essential FAA concentrations (principally in valine, leucine and isoleucine) in the white muscle following feeding. However, in the caeca total FAA, total essential FAA and a number of individual FAA were significantly elevated at 4, 9 and 15h following feeding. There were few significant correlations between dietary amino acid consumption and total tissue FAA and essential FAA concentration in the stomach, caecum and white muscle; correlations were stronger in the liver. In order to explain the relative constancy of total FAA concentrations in the tissues following food intake (which represents over 100% of the total FAA pool) a model is presented that quantifies the AA flux through the free pools and considers the role of protein turnover in regulating FAA pool size.

Keywords

rainbow trout free amino acid pools stomach caeca liver white muscle amino acid flux 

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Copyright information

© Kugler Publications 1995

Authors and Affiliations

  • C. G. Carter
    • 1
    • 2
  • Z-Y. He
    • 1
  • D. F. Houlihan
    • 1
  • I. D. McCarthy
    • 1
  • I. Davidson
    • 3
  1. 1.Department of ZoologyUniversity of AberdeenAberdeenU.K.
  2. 2.Department of AquacultureUniversity of TasmaniaLauncestonAustralia
  3. 3.Department of Molecular and Cell BiologyUniversity of Aberdeen, Marischal CollegeAberdeenU.K

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