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Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA
Citation
Alhazzaa, R and Bridle, AR and Nichols, PD and Carter, CG, Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA , Aquaculture: An International Journal Devoted to Fundamental Aquatic Food Resources, 312, (1-4) pp. 162-171. ISSN 0044-8486 (2011) [Refereed Article]
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DOI: doi:10.1016/j.aquaculture.2010.12.023
Abstract
Vegetable oils (VO) are sustainable sources for replacement of fish oil (FO) in aquafeeds. However, VO lacks the health-benefitting n-3 long-chain (¡Ý C20) polyunsaturated fatty acids (n-3 LC-PUFA) and potentially compromise farmed fish flesh quality for consumers. In a factorial experiment, barramundi (Lates calcarifer) were grown in either freshwater or seawater and fed on three diets containing different oil sources: FO; stearidonic acid (SDA, 18:4n-3) rich oil from Echium plantagineum (EO); or rapeseed oil (RO). RO and FO-fed fish grew faster than the EO treatment and all three dietary treatments were not affected by salinity. A fatty acid mass balance showed that feeding barramundi on EO diet bypassed the first rate-limiting step in n-3 LC-PUFA biosynthesis. However, the fish did not accumulate high EPA or DHA content. Total PUFA, mainly of the n-3 series and dominated by ALA (18:3n-3) and SDA, in the whole body of EO fish was higher than for the FO and RO treatments. The n-3:n-6 ratio in EO treatment was less than for FO, but exceeded that in RO-fed fish. FA apparent metabolism as derived from the fatty acid mass balance fluxes showed comparable kinetics for key enzymes, indicating limited efficiency for LC-PUFA biosynthesis from their C18 dietary precursors in barramundi fed EO or RO containing diets. Fish digested dietary FA and accumulated them efficiently regardless of the salinity. These findings establish a more comprehensive understanding for FA metabolism in barramundi fed different dietary lipids and at extremes of the species wide salinity range. Based on the observed levels of accumulation, EO-fed barramundi are a potentially rich source of ALA and SDA for human consumption.
Keywords: Lates calcarifer; Oil replacement; Fatty acid metabolism; Stearidonic acid
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Agricultural and Veterinary Sciences |
| Research Group: | Fisheries Sciences |
| Research Field: | Aquaculture |
| Objective Division: | Animal Production and Animal Primary Products |
| Objective Group: | Fisheries - Aquaculture |
| Objective Field: | Aquaculture Fin Fish (excl. Tuna) |
| Author: | Alhazzaa, R (Mr Ramez Alhazzaa) |
| Author: | Bridle, AR (Dr Andrew Bridle) |
| Author: | Carter, CG (Professor Chris Carter) |
| ID Code: | 66809 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 26 |
| Deposited By: | NC Marine Conservation and Resource Sustainability |
| Deposited On: | 2011-02-14 |
| Last Modified: | 2012-04-23 |
| Downloads: | 1 View Download Statistics |
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