Do changes in Atlantic salmon, Salmo salar L., fillet fatty acids following a dietary switch represent wash‐out or dilution? Test of a dilution model and its application
By M. Jobling. 2003
93 citations recorded by the source corpus.
The fatty acid compositions of fish tissue lipids usually reflect those of the feed lipids, but few attempts have been made to predict the way in which the profiles change or assess the time required for the fatty acid profile to stabilize following a dietary change. The present focus on the influences of vegetable oils and fish oils on the fatty acid compositions and sensory attributes of fish fillets increases the interest in the ability to make such predictions. A dilution model was tested using data for the influences of feed oils (rape/linseed (V) vs. sand-eel (F)) and dietary fat concentrations (ca. 30% (H) vs. ca. 20% (L)) on the body growth and fatty acid compositions of the fillets of Atlantic salmon, Salmo salar L., parr and post smolt. Fish given HV or LV feeds during freshwater rearing (mass increase from ca. 19 g to ca. 130 g) were switched to HF and LF feeds following parr-smolt transformation. The changes in fillet percentages of 18:1, 18:2 (n-6) and 18:3 (n-3) during 98 days of on-growing in seawater (mass increase from ca. 130 g to ca. 380 g) conformed closely to predictions made on the basis of the dilution model. Model applications require information about the proportionate increase in fillet fat over time, but the relative changes in body mass can be used as a surrogate provided that both fillet yield (as a % of body mass) and fillet fat percentage change little over time. This is not the case for small salmon, but does seem to apply to larger salmon as they approach harvest size. This means that, for large salmon, ratios of changes in body mass can be substituted for ratios in the quantitative change in fillet fat without the introduction of a large error in the prediction of the change in fillet fatty acid profile following the introduction of a novel feed.
Subfields: Aquatic Science, Immunology, Physiology
View Paper: https://www.semanticscholar.org/paper/b339dc5da9bfaea811dbbdf1d82c40293494a306
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Citations in the corpus
- Challenges and Opportunities in Finfish Nutrition (2006, background): “changes predictably following changes in dietary lipid source (Jobling 2003; Robin et al. 2003).”
- Fish oil replacement in finfish nutrition (2009, background): “An additional evaluation of the model by Jobling (2003) showed the positive aspects and the limits of the proposed dilution model.”
- Health and condition in fish: the influence of lipids on membrane competency and immune response (2009, methodology): “On the one hand, tissue FA composition of fishes largely reflects the diet (Shearer 1994 ; Jobling 2003) , and thus fishes fed marine-derived oils contain substantial amounts of bioactive HUFA, namely DHA, EPA, and ARA.”