Efficacy of canola oil, pork lard and marine oil singly and in combination as supplemental dietary lipid sources for juvenile coho salmon (Oncorhynchus kisutch)
1984; Elsevier BV; Volume: 36; Issue: 4 Linguagem: Inglês
10.1016/0044-8486(84)90326-0
ISSN1873-5622
AutoresB.S. Dosanjh, David A. Higgs, M.Dianne Plotnikoff, J. R. McBride, J. R. Markert, J. Thomas Buckley,
Tópico(s)Reproductive biology and impacts on aquatic species
ResumoCanola oil, pork lard and herring oil singly and in combination were assessed as supplemental sources of dietary lipid for juvenile coho salmon held at 10–12°C on a natural photoperiod over an 84-day period. Each of the six different types of supplemental lipid comprised about 56% of the lipid content (15% of dry matter) in an experimental dry diet (West Van 1). Some groups received Oregon moist pellets (OMP) which is presently the standard hatchery diet. All groups were fed twice daily to satiation. Relative to coho fed West Van 1 with marine oil alone, type of supplemental lipid did not influence coho growth, food, protein and energy utilization, body proximate composition, fish health or survival, or the histological structure of selected organs. Coho fed OMP grew significantly faster than those fed West Van 1 supplemented with lard or mixtures of canola oil with herring oil or lard due to increased appetite. Body lipid composition mirrored that of dietary lipids except levels of saturated and unsaturated fatty acids showed less variation than those in dietary lipids. It is concluded that canola oil, pork lard and a blend of these lipid sources are excellent alternative types of supplemental dietary lipid for coho salmon under our test conditions. They are more available, often less expensive, and less prone to oxidation than marine oil.
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