Abstract
Rainbow trout Oncorhynchus mykiss grew from 44 to 326 g in 96days when held at ∼12 °C. Fish were fed to satiation twice dailywith either high (L1: 30.8%, L2:31.4%) or lower-lipid feeds (C1: 18.8%,C2: 21.8%). Four feeding treatments were studied.Group C1C2 received feed C1 for 43 days(days 0–43) and C2 thereafter (days 44–96).Groups L1L2, L1C2 andC1L2 were subjected to dietary changes asindicated by the feed designations. After a short period of feedadaptation, fish ingested similar amounts of feed energy i.e., they ateless by weight of the lipid-rich (L) feeds. Feed lipid content did notaffect growth but fish fed L-feed had reduced feed conversion ratio(FCR) compared to fish fed C-feed (0.731 vs. 0.773) during days0–43 (P < 0.01). After 96 days,L1L2-fish were lower in body protein(15.8%) than the C1C2-fish (16.8%)(P < 0.01). L-feeds also tended to increase percentage lipidand reduce percentage whole body moisture and ash. A higher net proteinutilisation (NPU) was recorded in fish fed L-feeds (43.6%)compared to fish fed C-feeds (38.8%) in days 0–43(P < 0.05). This seemed to be the result of a lower proteinintake rather than a protein-sparing effect of feed lipid. Above athreshold value of approximately 6.5 mg protein eaten·g bodywtminus 1·day−1, NPU decreased.
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References
Alsop, D.H. and Wood, C.M. (1997) The interactive effects of feeding and exercise on oxygen consumption, swimming performance and protein usage in juvenile rainbow trout (Oncorhynchus mykiss). Journal of Experimental Biology 200, 2337–2346.
Alsted, N.S. (1991) Studies on the reduction of discharges from fish farms by modification of the diet. In: Nutritional Strategies and Aquaculture Waste(eds. C.B. Cowey and C.Y. Cho), University of Guelph, Guelph, Ontario, Canada, pp. 77–89.
Bjerkeng, B., Refstie, S., Fjalestad, K.T., Storebakken, T., Rødbotten, M. and Roem, A.J. (1997) Quality parameters of the flesh of Atlantic salmon (Salmo salar) as affected by dietary fat content and full-fat soybean meal as a partial substitute for fish meal in the diet. Aquaculture 157, 297–309.
Bligh, E.G. and Dyer, W.J. (1959) A rapid method of total lipid extraction and purification. Canadian Journal of Biochemistry and Physiology 37, 910–917.
Boujard, T. and Médale, F. (1994) Regulation of voluntary feed intake in juvenile rainbow trout fed by hand or by self-feeders with diets containing two different protein/energy ratios. Aquatic Living Resources 7, 211–215.
Brooks, S.P.J. and Lampi, B.J. (1997) Time course of enzyme changes after a switch from a high-fat to a low-fat diet. Comparative Biochemistry and Physiology 118B, 359–365.
Cho, C.Y. and Kaushik, S.J. (1990) Nutritional energetics in fish: Energy and protein utilization in rainbow trout (Salmo gairdneri). In: Aspects of Food Production, Consumption and Energy Values(ed. G.H. Bourne), Basel, Karger, vol. 61, pp. 132–172.
Cowey, C.B. (ed.) (1995) Nutritional strategies and management of aquaculture waste. Water Science and Technology 31, 1–262.
Cowey C.B. and Cho C.Y. (eds.) (1991) Nutritional Strategies and Aquaculture Waste, University of Guelph, Guelph, Ontario, Canada. 274 pp.
De La Higuera, M., Murillo, A., Varela, G. and Zamora, S. (1977) The influence of high dietary fat levels on protein utilization by the trout (Salmo gairdneri). Comparative Biochemistry and Physiology 56, 37–41.
Einen, O. and Roem, A.J. (1997). Dietary protein/energy ratios for Atlantic salmon in relation to fish size: growth, feed utilization and slaughter quality. Aquaculture Nutrition 3, 115–126.
From, J. and Rasmussen, G. (1984) A growth model, gastric evacuation, and body composition in rainbow trout, Salmo gairdneri Richardson, 1836. Dana 3, 61–139.
Grisdale-Helland, B. and Helland, S.J. (1997). Replacement of protein by fat and carbohydrate in diets for Atlantic salmon (Salmo salar) at the end of the freshwater stage. Aquaculture152, 167–180.
Hillestad,M., Johnsen, F., Austreng, E. and Åsgård, T. (1998) Long-term effects of dietary fatlevel and feeding rate on growth, feed utilization and carcass quality of Atlantic salmon. Aquaculture Nutrition 4, 89–97.
Jayaram, M.G. and Beamish, F.W.H. (1992) Influence of dietary protein and lipid on nitrogen and energy losses in lake trout, Salvelinus namaycush. Canadian Journal of Fisheries and Aquatic Sciences 49, 2267–2272.
Jobling, M., Koskela, J. and Savolainen, R. (1998) Influence of dietary fat level and increased adiposity on growth and fat deposition in rainbow trout, Oncorhynchus mykiss (Walbaum). Aquaculture Research 29, 601–607.
Johnsen, F., Hillestad, M. and Austreng, E. (1993). High energy diets for Atlantic salmon.Effects on pollution. In: Fish Nutrition in Practice(eds. S.J. Kaushik and P. Luquet), INRA, Paris, pp. 391–401.
Jokumsen, A. and Alsted, N. (1990). Ørredvækst i relation til forholdet mellem protein og fedt i foderet. Meddelelser fra Forsøgsdambruget 80, 1–15 (in Danish).
Kaushik, S.J. (1993) Recent trends in the development of high-energy diets for salmonids. In: Proceedings of the Second International Feed Production Conference(ed. G. Piva), Piacenza, Italy. Facoltá di Agraria 1192/02/25–25, pp. 361–372.
Kennish, J.M., Sharp-Dahl, J.L., Chambers, K.A., Thrower, F. and Rice, S.D. (1992) The effect of a herring diet on lipid composition, fatty acid composition, and cholesterol levels in the muscle tissue of pen-reared chinook salmon (Oncorhynchus tshawytscha). Aquaculture 108, 309–322.
Lee, D.J. and Putnam, G.B. (1973). The response of rainbow trout to varying protein/energy ratios in a test diet. Journal of Nutrition 103, 916–922.
Rasmussen, R.S. and Korsgaard, B. (1996) The effect of external ammonia on growth and food utilization of juvenile turbot (Scophthalmus maximus L.). Journal of Experimental Marine Biology and Ecology 205, 35–48.
Rasmussen, R.S. and Ostenfeld, T.H. (2000) Effect of growth rate on quality traits and feed utilisation of rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis). Aquaculture 184, 327–337.
Refstie, S., Korsøen, Ø.J., Storebakken, T., Baeverfjord, G., Lein, I. and Roem, A.J. (2000) Differing nutritional responses to dietary soybean meal in rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). Aquaculture 190, 49–63.
Reinitz, G. and Hitzel, F. (1980) Formulation of practical diets for rainbow trout based on desired performance and body composition. Aquaculture 19, 243–252.
Shearer, K.D., Silverstein, J.F. and Plisetskaya, E.M. (1997) Role of adiposity in food intake control of juvenile chinook salmon (Oncorhynchus tshawytscha). Comparative Biochemistry and Physiology 118A, 1209–1215.
Williams, S. (1984) Official Methods of Analysis, Association of Official Analytical Chemists, Inc., Virginia, 1141 pp.
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Rasmussen, R., Ostenfeld, T. & McLean, E. Growth and feed utilisation of rainbow trout subjected to changes in feed lipid concentrations. Aquaculture International 8, 531–542 (2000). https://doi.org/10.1023/A:1009291227550
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DOI: https://doi.org/10.1023/A:1009291227550