Aquaculture Nutrition Volume 17, Number 6 (December 2011) 
Nutritional responses in rainbow trout (Oncorhynchus mykiss) fed diets with different physical qualities at stable or variable environmental conditions
Authors: T.S. AAS1,2, B.F. TERJESEN 1, T. SIGHOLT 3, M. HILLESTAD 3, J. HOLM 4, S. REFSTIE1,5, G. BAEVERFJORD 1, K.-A. RØRVIK6,7, M. SØRENSEN6,8, M. OEHME1,6,7, T. ÅSGÅRD1,6 Author Affiliations:
| 1: | Nofima, Sunndalsøra, Norway |
| 2: | Centre for Research Based Innovation in Aquaculture Technology (CREATE), SFI, SINTEF Sealab, Trondheim, Norway |
| 3: | BioMar AS, Trondheim, Norway |
| 4: | BioMar A/S, Brande, Denmark |
| 5: | Aquaculture Protein Centre, CoE, Department of Basic Sciences and Aquatic Medicine, Norwegian School of Veterinary Science, Oslo, Norway |
| 6: | Nofima, Ås, Norway |
| 7: | Norwegian University of Life Sciences (UMB), Department of Animal and Aquacultural Sciences, Ås, Norway |
| 8: | Aquaculture Protein Centre, CoE, Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Norway |
Source: Aquaculture Nutrition, Volume 17, Number 6 (December 2011) Page Numbers: 657 – 670 Available Full Text:
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Abstract: Rainbow trout with initial body weight 1144 g were fed two diets with high (feed A) or low (feed B) water stability for 6 weeks. During the last 2 weeks either stable or fluctuating oxygen saturation, salinity and temperature was introduced. High water stability of the feed was associated with harder pellets, less dust formation and less broken pellets compared to feed with low water stability. During the first 4 weeks, feed intake was 23% higher in trout fed diet B than in those fed diet A. Fluctuating environment resulted in a severe drop in feed intake for both dietary groups. At termination of the trial, stomachs of trout fed feed B contained mashed pellets and free water and oil. Stomachs of trout fed feed A contained more intact pellets and little fluid. The apparent digestibility of protein, starch, dry matter and energy was highest in feed A. The apparent digestibility of P and Zn was highest at stable environment, and the absorption of P was highest from feed A. In conclusion, physical quality affected the nutritional value of the feeds, and differences in nutritional value at stable or fluctuating environment appeared to be related to feed intake.
Citation: T.S. AAS, B.F. TERJESEN, T. SIGHOLT, M. HILLESTAD, J. HOLM, S. REFSTIE, G. BAEVERFJORD, K.-A. RØRVIK, M. SØRENSEN, M. OEHME, T. ÅSGÅRD . Nutritional responses in rainbow trout (Oncorhynchus mykiss) fed diets with different physical qualities at stable or variable environmental conditions. Aquaculture Nutrition, Volume 17, Number 6 (December 2011), pp. 657-670,
URL: http://ejournals.ebsco.com/direct.asp?ArticleID=495C9BEF6CD1522EF1DA
