Inclusion of camelina meal as a protein source in diets for farmed Atlantic cod Gadus morhua |
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| Authors: | Stefanie M Hixson Christopher C Parrish Jeanette S Wells E Marie Winkowski Derek M Anderson |
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| Affiliation: | 1. Department of Ocean Sciences, Memorial University of Newfoundland, St. John's, NF, Canada;2. Faculty of Agriculture, Dalhousie University, Truro, NS, Canada |
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| Abstract: | Camelina meal Camelina sativa (CM) is a potential protein source in aquaculture feeds, because of its crude protein level (39%) and essential amino acids. Two feeding experiments were conducted with Atlantic cod Gadus morhua. Cod in Experiment I (19.4 g fish?1) were fed diets with 0%, 12% or 24% CM for 9.5 weeks at 10°C; and cod in Experiment II (14.4 g fish?1) were fed diets with 0%, 15%, 30% or 40% CM for 13 weeks at 10°C. Growth, lipid and amino acid tissue composition were compared amongst cod fed varying levels of CM. In Experiment I, cod could tolerate the highest level of CM inclusion (24%) without affecting growth compared to cod fed the control diet. In Experiment II, growth performance was significantly affected at 30% CM inclusion compared to the control treatment, and cod fed 15% CM displayed some signs of depressed growth (reduced feed intake and weight gain). Both treatment and duration were interacting factors (P = 0.015) that determined growth performance when comparing both experiments. Muscle tissue composition was relatively unaltered with less than 30% CM inclusion; however, multivariate statistics revealed significant differences in muscle tissue fatty acid composition between cod fed 40% CM and the control diet. The tissue amino acid profile was generally unaltered because the dietary amino acid profile was consistent after CM inclusion. A few antinutritive compounds in CM may have affected palatability in diets with greater than 30% CM inclusion, which may have resulted in reduced growth performance. |
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| Keywords: | amelina fish meal Atlantic cod lipids fatty acids amino acids |
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