Fish Physiology and Biochemistry

, Volume 41, Issue 1, pp 243–253

Comparison of endogenous loss and maintenance need for minerals in rainbow trout (Oncorhynchus mykiss) fed fishmeal or plant ingredient-based diets

  • P. Antony Jesu Prabhu
  • S. J. Kaushik
  • C. Mariojouls
  • A. Surget
  • S. Fontagné-Dicharry
  • J. W. Schrama
  • I. Geurden
Article

DOI: 10.1007/s10695-014-0020-y

Cite this article as:
Antony Jesu Prabhu, P., Kaushik, S.J., Mariojouls, C. et al. Fish Physiol Biochem (2015) 41: 243. doi:10.1007/s10695-014-0020-y

Abstract

Mineral needs as affected by changes in dietary protein and oil sources were studied in rainbow trout. Duplicate groups (n = 30 fish per replicate) of rainbow trout (initial BW: 37 g) were fed either a fish meal/fish oil-based (M) or a complete plant ingredient (V)-based diet at four graded ration (R) levels [apparent satiation (AS), R75, R50 and R25 % of AS]; one treatment group was maintained under starvation. The feeding trial lasted 12 weeks at a water temperature of 17 °C. Dietary intake, apparent digestibility and initial and final whole-body composition data were used to calculate mineral gain which was regressed against digestible mineral intake (both expressed as mg or µg kg−0.8 day−1). Starvation loss (SL), endogenous loss of fed fish (ELF, y-intercept at x = 0) and point of intake for zero balance (PZB, x-intercept at y = 0) were used as estimates of maintenance requirements. SL provided the lowest estimate, ELF provided the net requirement of a mineral for maintenance and PZB provided the digestible dietary intake required to meet maintenance (SL < ELF < PZB). Dietary ingredient composition did not significantly affect the digestible mineral supply required for maintenance (PZB) for any of the minerals (P, Mg, K, Cu and Zn) studied. However, ELF of micro-minerals such as Cu and Zn were significantly affected. The ELF of Cu was significantly lower and that of Zn was significantly higher in V group compared with M-fed fish. Further studies on the effects of such changes in dietary formulations on micro-mineral metabolism are warranted.

Keywords

Rainbow troutDietary changesMineralsEndogenous lossMaintenance

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • P. Antony Jesu Prabhu
    • 1
    • 2
    • 3
  • S. J. Kaushik
    • 1
  • C. Mariojouls
    • 3
  • A. Surget
    • 1
  • S. Fontagné-Dicharry
    • 1
  • J. W. Schrama
    • 2
  • I. Geurden
    • 1
  1. 1.INRA, UR 1067, Nutrition, Metabolism and Aquaculture (NuMeA), AquapôleSaint-Pee-Sur-NivelleFrance
  2. 2.AFI, WIASWageningen UniversityWageningenThe Netherlands
  3. 3.AgroParisTechParis, Cedex 5France