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n-3 LC-PUFA deposition efficiency and appetite-regulating hormones are modulated by the dietary lipid source during rainbow trout grow-out and finishing periods |
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| Authors: | D S Francis T Thanuthong S P S D Senadheera M Paolucci E Coccia S S De Silva G M Turchini |
| Institution: | 1. Australian Institute of Marine Science, PMB No 3, Townsville, QLD, 4810, Australia 2. School of Life and Environmental Sciences, Deakin University, PO Box 423, Warrnambool, VIC, 3280, Australia 3. Faculty of Agricultural Technology, Songkhla Rajabhat University, Songkhla, 90000, Thailand 4. Ocean University (National Institute of Fisheries and Nautical Engineering), Colombo 15, Sri Lanka 5. Department of Sciences and Technologies, University of Sannio, Via Port’Arsa, 11, 82100, Benevento, Italy |
| Abstract: | Largely attributable to concerns surrounding sustainability, the utilisation of omega-3 long-chain polyunsaturated fatty acid-rich (n-3 LC-PUFA) fish oils in aquafeeds for farmed fish species is an increasingly concerning issue. Therefore, strategies to maximise the deposition efficiency of these key health beneficial fatty acids are being investigated. The present study examined the effects of four vegetable-based dietary lipid sources (linseed, olive, palm and sunflower oil) on the deposition efficiency of n-3 LC-PUFA and the circulating blood plasma concentrations of the appetite-regulating hormones, leptin and ghrelin, during the grow-out and finishing phases in rainbow trout culture. Minimal detrimental effects were noted in fish performance; however, major modifications were apparent in tissue fatty acid compositions, which generally reflected that of the diet. These modifications diminished somewhat following the fish oil finishing phase, but longer-lasting effects remained evident. The fatty acid composition of the alternative oils was demonstrated to have a modulatory effect on the deposition efficiency of n-3 LC-PUFA and on the key endocrine hormones involved in appetite regulation, growth and feed intake during both the grow-out and finishing phases. In particular, n-6 PUFA (sunflower oil diet) appeared to ‘spare’ the catabolism of n-3 LC-PUFA and, as such, resulted in the highest retention of these fatty acids, ultimately highlighting new nutritional approaches to maximise the maintenance of the qualitative benefits of fish oils when they are used in feeds for aquaculture species. |
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