Maintenance ration, protein synthesis capacity, plasma insulin and growth of Atlantic salmon (Salmo salar L.) with genetically different trypsin isozymes
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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.
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- Maintenance ration, protein synthesis capacity, plasma insulin and growth of Atlantic salmon (Salmo salar L.) with genetically different trypsin isozymes
Fish Physiology and Biochemistry
Volume 21, Issue 3 , pp 223-233
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- Atlantic salmon
- individual feed consumption rate
- plasma insulin
- protein synthesis capacity
- trypsin isozymes
- Author Affiliations
- 1. Matre Aquaculture Research Station, Department of Aquaculture, Institute of Marine Research, N-5984 , Matredal, Norway (Phone
- 2. Department of Zoology, University of Aberdeen, Tillydrone Avn., AB9 2TN, Aberdeen, UK
- 3. Department of Biochemistry, Physiology and Nutrition, Norwegian School of Veterinary Science, P.O. Box 8146 Dep., 0033 , Oslo, Norway