Monola oil versus canola oil as a fish oil replacer in rainbow trout feeds: Effects on growth,fatty acid metabolism and final eating quality |
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Authors: | GM Turchini VM Moretti K Hermon F Caprino ML Busetto F Bellagamba T Rankin RSJ Keast DS Francis |
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Affiliation: | 1. School of Life and Environmental Sciences, Deakin University, Warrnambool, Victoria, Australia;2. Dipartimento di Scienze Veterinarie per la Salute, la Produzione Animale e la Sicurezza Alimentare, Università degli Studi di Milano, Milan, Italy;3. Nuseed Global, Laverton, Victoria, Australia;4. School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria, Australia;5. Australian Institute of Marine Science, Townsville, Queensland, Australia |
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Abstract: | Monola oil, a high oleic acid canola cultivar, and canola oil were evaluated as replacers of fish oil at three levels of inclusion (60%, 75% and 90%) in rainbow trout diets. After a 27-week grow-out cycle, the diet-induced effects on growth, fatty acid metabolism and final eating quality were assessed. Overall, no effects were noted for growth, feed utilisation or fish biometry, and the fatty acid composition of fish fillets mirrored that of the diets. Dietary treatments affected fillet lipid oxidation (free malondialdehyde), pigmentation and flavour volatile compounds, but only minor effects on sensorial attributes were detected. Ultimately, both oils were demonstrated to possess, to differing extents, suitable qualities to adequately replace fish oil from the perspective of fish performance and final product quality. However, further research is required to alleviate on-going issues associated with the loss of health promoting attributes (n-3 long chain polyunsaturated fatty acids) of final farmed products. |
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Keywords: | Aquaculture Oncorhynchus mykiss n-3 LC-PUFA Oleic acid Fillet quality Panel test Volatile compounds |
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