Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA
Vegetable oils (VO) are sustainable sources for replacement of fish oil (FO) in aquafeeds. However, VO lacks the health-benefitting n-3 long-chain (=C20) polyunsaturated fatty acids (n-3 LC-PUFA) and potentially compromise farmed fish flesh quality for consumers. In a factorial experiment, barramund...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/39768 |
| _version_ | 1848755682091728896 |
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| author | Alhazzaa, Ramez Bridle, A. Nichols, P. Carter, C. |
| author_facet | Alhazzaa, Ramez Bridle, A. Nichols, P. Carter, C. |
| author_sort | Alhazzaa, Ramez |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Vegetable oils (VO) are sustainable sources for replacement of fish oil (FO) in aquafeeds. However, VO lacks the health-benefitting n-3 long-chain (=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. © 2010 Elsevier B.V. |
| first_indexed | 2025-11-14T09:00:11Z |
| format | Journal Article |
| id | curtin-20.500.11937-39768 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:00:11Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-397682017-09-13T14:30:05Z Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA Alhazzaa, Ramez Bridle, A. Nichols, P. Carter, C. Vegetable oils (VO) are sustainable sources for replacement of fish oil (FO) in aquafeeds. However, VO lacks the health-benefitting n-3 long-chain (=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. © 2010 Elsevier B.V. 2011 Journal Article http://hdl.handle.net/20.500.11937/39768 10.1016/j.aquaculture.2010.12.023 restricted |
| spellingShingle | Alhazzaa, Ramez Bridle, A. Nichols, P. Carter, C. Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title | Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title_full | Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title_fullStr | Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title_full_unstemmed | Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title_short | Replacing dietary fish oil with Echium oil enriched barramundi with C18 PUFA rather than long-chain PUFA |
| title_sort | replacing dietary fish oil with echium oil enriched barramundi with c18 pufa rather than long-chain pufa |
| url | http://hdl.handle.net/20.500.11937/39768 |