Fish Physiology and Biochemistry

, Volume 21, Issue 3, pp 223–233 | Cite as

Maintenance ration, protein synthesis capacity, plasma insulin and growth of Atlantic salmon (Salmo salar L.) with genetically different trypsin isozymes

  • K. Rungruangsak-Torrissen
  • C.G. Carter
  • A. Sundby
  • A. Berg
  • D.F. Houlihan
Article

Abstract

Growth was found to be associated with the changes of trypsin activity in the pyloric caecal tissues and the level of plasma insulin in Atlantic salmon (Salmo salar L.). A decrease in trypsin activity accompanied by an increase in plasma insulin was detected one month before an enhanced growth was observed. There were significant relationships between weight specific consumption rate, plasma insulin levels and fish growth. The correlation of weight specific consumption rate was higher with growth rate (R2=0.7, p<0.0001) than with plasma insulin concentration (R2=0.4, p<0.0001).

When the comparison was made between Atlantic salmon carrying and lacking the trypsin variant TRP-2*92, the fish with the variant had lower maintenance ration (p<0.05), higher capacity for protein synthesis in the white muscle (p<0.02), and a greater ability to utilize the feed at a restricted ration than the fish without the variant. In Atlantic salmon lacking the variant, both plasma insulin concentrations and growth rates were significantly lower (p<0.05) in the fish fed 0.5% bw day−1 than those fed 1% bw day−1. Whilst the growth rates of TRP-2*92 salmon fed the different rations became similar one month after similar levels of plasma insulin were observed between them. The TRP-2*92 salmon may be defined as a high protein growth efficiency fish with low protein turnover rate.

Genetic variation in trypsin isozyme pattern affects feed utilization, plasma insulin levels and growth in Atlantic salmon.

Atlantic salmon growth individual feed consumption rate plasma insulin protein synthesis capacity trypsin isozymes 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • K. Rungruangsak-Torrissen
    • 1
  • C.G. Carter
    • 2
  • A. Sundby
    • 3
  • A. Berg
    • 1
  • D.F. Houlihan
    • 2
  1. 1.Matre Aquaculture Research Station, Department of AquacultureInstitute of Marine ResearchMatredalNorway (Phone
  2. 2.Department of ZoologyUniversity of AberdeenAberdeenUK
  3. 3.Department of BiochemistryPhysiology and Nutrition, Norwegian School of Veterinary ScienceOsloNorway

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