Effects of dietary protein and fat level and rapeseed oil on growth and tissue fatty acid composition and metabolism in Atlantic salmon (Salmo salar L.) reared at low water temperatures

Citation

Karalazos V, Bendiksen EA, Dick JR & Bell JG (2007) Effects of dietary protein and fat level and rapeseed oil on growth and tissue fatty acid composition and metabolism in Atlantic salmon (Salmo salar L.) reared at low water temperatures. Aquaculture Nutrition, 13 (4), pp. 256-265. https://doi.org/10.1111/j.1365-2095.2007.00471.x

Abstract
A 12 week feeding trial was conducted to elucidate the interactive effects of dietary fat and protein contents and oil source on growth, fatty acid composition, protein retention efficiency (PRE) and β-oxidation activity of muscle and liver in Atlantic salmon (Salmo salar L.) at low water temperatures (4.2 oC). Triplicate groups of Atlantic salmon (initial weight 1168 g) were fed six isoenergetic diets formulated to provide either 390 g kg-1 protein and 320 g kg-1 fat (high protein (HP) diets) or 340 g kg-1 protein and 360 g kg-1 fat (low protein (LP) diets); within each dietary protein/fat level crude RO comprised 0, 30 or 60% (R0, R30, R60, respectively) of the added oil. After 12 weeks the overall growth and FCR were very good for all treatments (TGC; 4.76 (±0.23), FCR; 0.85 (±0.02)). Significant effects were shown due to oil source on SGR and TGC only. The liver and muscle FA compositions were highly affected by the graded inclusion of RO. The PRE was significantly affected by the dietary protein level, while no significant effects were shown in total β-oxidation capacity of liver and muscle. The results of this study suggest that more sustainable, lower protein diets with moderate RO inclusion can be used in Atlantic salmon culture at low water temperatures with no negative effects on growth and feed conversion, no major detrimental effects on lipid and fatty acid metabolism and a positive effect on protein sparing.

Keywords
Rapeseed oil; Dietary protein / lipid ratio; Polyunsaturated fatty acids (PUFA); Atlantic salmon; β-Oxidation; Protein sparing effect; Fishes Nutrition Requirements; Fishes Feeding and feeds.; Aquaculture; Fishes Nutrition

Journal
Aquaculture Nutrition: Volume 13, Issue 4

• Aqua Nutr - Karalazos et al. - Effects of dietary protein and fat level and RO on Atlantic Salmon1.doc
• Aqua Nutr - Karalazos et al. - Effects of dietary protein and fat level and RO on Atlantic Salmon1.pdf