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Araújo BC, Miller MR, Walker SP, Symonds JE. The influence of temperature on performance, biological indices, composition, and nutrient retention of juvenile Chinook salmon (Oncorhynchus tshawytscha) reared in freshwater. Comp Biochem Physiol A Mol Integr Physiol 2023; 280:111412. [PMID: 36878388 DOI: 10.1016/j.cbpa.2023.111412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 03/01/2023] [Accepted: 03/01/2023] [Indexed: 03/07/2023]
Abstract
This study investigated the effects of different temperatures on the performance, composition, and nutrient retention of Chinook salmon reared in freshwater. Individuals (187.6 ± 27.1 g) were distributed into twelve tanks of 8000 L each (155 to 157 fish per tank) at a temperature of 14 °C. The tanks were transitioned from 14 °C (hatchery temperature) to 8, 12, 16, and 20 °C over seven days. Three fish assessments were performed, the first (initial) when the fish were distributed in the tanks, a second (interim) between days 9 and 16 at the start of the experiment, and a third (final) after 41 to 49 days at the target temperature. At the end of the trial, performance parameters, proximate composition, amino acid, and fatty acid composition, and nutrient retention were evaluated. Better growth performance was observed in fish at 16 °C and 20 °C compared to the lower temperatures. Fish at higher temperatures had higher levels of saturated fatty acids (SFA), while at lower temperatures fish had higher levels of n-3 and n-6 polyunsaturated fatty acids (PUFA), especially eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). A polynomial relationship between nutrient retention and temperature showed that fish from all treatments retained more lipids than proteins, with higher retention of MUFA compared to the other fatty acid classes. Additionally, DHA retention was approximately three times higher than EPA retention. The results showed that 16 to 20 °C was the optimum temperature range for Chinook salmon, and the performance differences were mainly modulated by lipid retention/catabolism.
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Rocker MM, Mock TS, Turchini GM, Francis DS. The judicious use of finite marine resources can sustain Atlantic salmon (salmo salar) aquaculture to 2100 and beyond. NATURE FOOD 2022; 3:644-649. [PMID: 37118604 DOI: 10.1038/s43016-022-00561-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/28/2022] [Indexed: 04/30/2023]
Abstract
The production of farmed Atlantic salmon (Salmo salar) is currently linked to finite marine resources, particularly fish oil (FO) and fish meal (FM). Understanding this relationship in a quantitative manner is imperative if this critical balance is to be maintained within sustainable limits as the industry grows. Here we project the potential production and associated growth of the Atlantic salmon aquaculture industry on the basis of a variety of FO and FM utilization scenarios in aquafeed. Reducing FO and FM dietary inclusion to 3% each could permit production growth of 2% per year until the turn of the century (2097 and beyond 2100, respectively), independent of a host of alternatives now being utilized-with three portions of salmon per week providing almost all the recommended weekly long-chain omega-3 fatty acids for human intake. The Atlantic salmon industry's positive annual growth can continue in an era of finite marine resource availability-without the need for additional finite marine resource inputs.
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Affiliation(s)
- Melissa M Rocker
- Nutrition and Seafood Laboratory (NuSea.Lab), School of Life and Environmental Sciences, Deakin University, Queenscliff, Victoria, Australia
| | - Thomas S Mock
- Nutrition and Seafood Laboratory (NuSea.Lab), School of Life and Environmental Sciences, Deakin University, Queenscliff, Victoria, Australia
| | - Giovanni M Turchini
- School of Agriculture and Food, University of Melbourne, Melbourne, Victoria, Australia
| | - David S Francis
- Nutrition and Seafood Laboratory (NuSea.Lab), School of Life and Environmental Sciences, Deakin University, Queenscliff, Victoria, Australia.
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Mohammad Ali Jalali S, Parrish CC, Caballero-Solares A, Rise ML, Taylor RG. Effects of Varying Dietary Docosahexaenoic, Eicosapentaenoic, Linoleic, and α-Linolenic Acid Levels on Fatty Acid Composition of Phospholipids and Neutral Lipids in the Liver of Atlantic Salmon, Salmo salar. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:2697-2710. [PMID: 33476167 DOI: 10.1021/acs.jafc.0c05182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Fish oil, the most abundant natural source of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), is a limited resource; however, terrestrial oils are used as an alternative in fish nutrition. The liver of Atlantic salmon is able to synthesize these two long-chain n-3 polyunsaturated fatty acids (n-3LC-PUFAs) from α-linolenic acid (ALA), but the dietary levels of EPA + DHA and the ratios of linoleic acid (LNA) to ALA may affect its abilities. Feeding Atlantic salmon four experimental diets containing EPA + DHA at 0.3 and 1.0% of dietary levels accompanied with high and low LNA/ALA ratios showed that low LNA/ALA ratios increased the proportions of EPA + DHA in phospholipids (PLs) and neutral lipids (NLs). The pattern of PL-to-NL ratios of n-3 LC-PUFA proportions matched the saw tooth pattern of LNA/ALA ratios in diets. Overall, when fish oil is removed from salmon diets, the dietary LNA/ALA ratio must be reduced to stimulate biosynthesis of n-3 LC-PUFAs in the liver.
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Affiliation(s)
- Sayed Mohammad Ali Jalali
- Department of Animal Sciences, Faculty of Agriculture and Veterinary Medicine, Shahrekord Branch, Islamic Azad University, Shahrekord 8813733395, Iran
| | - Christopher C Parrish
- Department of Ocean Sciences, Memorial University of Newfoundland, St. John's A1C 5S7, Newfoundland and Labrador, Canada
| | - Albert Caballero-Solares
- Department of Ocean Sciences, Memorial University of Newfoundland, St. John's A1C 5S7, Newfoundland and Labrador, Canada
| | - Matthew L Rise
- Department of Ocean Sciences, Memorial University of Newfoundland, St. John's A1C 5S7, Newfoundland and Labrador, Canada
| | - Richard G Taylor
- Cargill Animal Nutrition, Elk River 55330, Minnesota, United States
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Xu H, Turchini GM, Francis DS, Liang M, Mock TS, Rombenso A, Ai Q. Are fish what they eat? A fatty acid’s perspective. Prog Lipid Res 2020; 80:101064. [DOI: 10.1016/j.plipres.2020.101064] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/08/2020] [Accepted: 09/11/2020] [Indexed: 12/13/2022]
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Petrie JR, Zhou XR, Leonforte A, McAllister J, Shrestha P, Kennedy Y, Belide S, Buzza G, Gororo N, Gao W, Lester G, Mansour MP, Mulder RJ, Liu Q, Tian L, Silva C, Cogan NOI, Nichols PD, Green AG, de Feyter R, Devine MD, Singh SP. Development of a Brassica napus (Canola) Crop Containing Fish Oil-Like Levels of DHA in the Seed Oil. FRONTIERS IN PLANT SCIENCE 2020; 11:727. [PMID: 32595662 PMCID: PMC7303301 DOI: 10.3389/fpls.2020.00727] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 05/06/2020] [Indexed: 05/07/2023]
Abstract
Plant seeds have long been promoted as a production platform for novel fatty acids such as the ω3 long-chain (≥ C20) polyunsaturated fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) commonly found in fish oil. In this article we describe the creation of a canola (Brassica napus) variety producing fish oil-like levels of DHA in the seed. This was achieved by the introduction of a microalgal/yeast transgenic pathway of seven consecutive enzymatic steps which converted the native substrate oleic acid to α-linolenic acid and, subsequently, to EPA, docosapentaenoic acid (DPA) and DHA. This paper describes construct design and evaluation, plant transformation, event selection, field testing in a wide range of environments, and oil profile stability of the transgenic seed. The stable, high-performing event NS-B50027-4 produced fish oil-like levels of DHA (9-11%) in open field trials of T3 to T7 generation plants in several locations in Australia and Canada. This study also describes the highest seed DHA levels reported thus far and is one of the first examples of a deregulated genetically modified crop with clear health benefits to the consumer.
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Affiliation(s)
| | - Xue-Rong Zhou
- CSIRO Agriculture and Food, Canberra, ACT, Australia
| | | | | | | | - Yoko Kennedy
- CSIRO Agriculture and Food, Canberra, ACT, Australia
| | | | - Greg Buzza
- Nuseed Pty Ltd., Horsham, VIC, Australia
| | | | - Wenxiang Gao
- Nuseed Americas Inc., Woodland, CA, United States
| | | | | | | | - Qing Liu
- CSIRO Agriculture and Food, Canberra, ACT, Australia
| | - Lijun Tian
- CSIRO Agriculture and Food, Canberra, ACT, Australia
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Colombo SM, Rodgers TFM, Diamond ML, Bazinet RP, Arts MT. Projected declines in global DHA availability for human consumption as a result of global warming. AMBIO 2020; 49:865-880. [PMID: 31512173 PMCID: PMC7028814 DOI: 10.1007/s13280-019-01234-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/22/2019] [Accepted: 07/20/2019] [Indexed: 05/21/2023]
Abstract
Docosahexaenoic acid (DHA) is an essential, omega-3, long-chain polyunsaturated fatty acid that is a key component of cell membranes and plays a vital role in vertebrate brain function. The capacity to synthesize DHA is limited in mammals, despite its critical role in neurological development and health. For humans, DHA is most commonly obtained by eating fish. Global warming is predicted to reduce the de novo synthesis of DHA by algae, at the base of aquatic food chains, and which is expected to reduce DHA transferred to fish. We estimated the global quantity of DHA (total and per capita) currently available from commercial (wild caught and aquaculture) and recreational fisheries. The potential decrease in the amount of DHA available from fish for human consumption was modeled using the predicted effect of established global warming scenarios on algal DHA production and ensuing transfer to fish. We conclude that an increase in water temperature could result, depending on the climate scenario and location, in a ~ 10 to 58% loss of globally available DHA by 2100, potentially limiting the availability of this critical nutrient to humans. Inland waters show the greatest potential for climate-warming-induced decreases in DHA available for human consumption. The projected decrease in DHA availability as a result of global warming would disproportionately affect vulnerable populations (e.g., fetuses, infants), especially in inland Africa (due to low reported per capita DHA availability). We estimated, in the worst-case scenario, that DHA availability could decline to levels where 96% of the global population may not have access to sufficient DHA.
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Affiliation(s)
- Stefanie M. Colombo
- Present Address: Department of Animal Science and Aquaculture, Faculty of Agriculture, Dalhousie University, 58 Sipu Road, Haley Building, Bible Hill, Truro, NS B2N 5E3 Canada
- Department of Chemistry and Biology, Ryerson University, 350 Victoria St., Toronto, ON M5B 2K3 Canada
| | - Timothy F. M. Rodgers
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON Canada
- Department of Earth Sciences, University of Toronto, 22 Russell St., Toronto, ON M5S 3B1 Canada
| | - Miriam L. Diamond
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON Canada
- Department of Earth Sciences, University of Toronto, 22 Russell St., Toronto, ON M5S 3B1 Canada
| | - Richard P. Bazinet
- Department of Nutritional Sciences, University of Toronto, Medical Sciences Building, 5th Floor, Room 5358, 1 King’s College Circle, Toronto, ON M5S 1A8 Canada
| | - Michael T. Arts
- Department of Chemistry and Biology, Ryerson University, 350 Victoria St., Toronto, ON M5B 2K3 Canada
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Irvine NA, Ruyter B, Østbye TK, Sonesson AK, Lillycrop KA, Berge G, Burdge GC. Dietary Fish Oil Alters DNA Methylation of Genes Involved in Polyunsaturated Fatty Acid Biosynthesis in Muscle and Liver of Atlantic Salmon (Salmo salar). Lipids 2019; 54:725-739. [PMID: 31658496 DOI: 10.1002/lipd.12198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 07/16/2019] [Accepted: 09/19/2019] [Indexed: 01/13/2023]
Abstract
Adequate dietary supply of eicosapentaenoic acid (20:5n-3) and docosahexaenoic acid (22:6n-3) is required to maintain health and growth of Atlantic salmon (Salmo salar). However, salmon can also convert α-linolenic acid (18:3n-3) into eicosapentaenoic acid (20:5n-3) and docosahexaenoic acid (22:6n-3) by sequential desaturation and elongation reactions, which can be modified by 20:5n-3 and 22:6n-3 intake. In mammals, dietary 20:5n-3 + 22:6n-3 intake can modify Fads2 expression (Δ6 desaturase) via altered DNA methylation of its promoter. Decreasing dietary fish oil (FO) has been shown to increase Δ5fad expression in salmon liver. However, it is not known whether this is associated with changes in the DNA methylation of genes involved in polyunsaturated fatty acid synthesis. To address this, we investigated whether changing the proportions of dietary FO and vegetable oil altered the DNA methylation of Δ6fad_b, Δ5fad, Elovl2, and Elovl5_b promoters in liver and muscle from Atlantic salmon and whether any changes were associated with mRNA expression. Higher dietary FO content increased the proportions of 20:5n-3 and 22:6n-3 and decreased Δ6fad_b mRNA expression in liver, but there was no effect on Δ5fad, Elovl2, and Elovl5_b expression. There were significant differences between liver and skeletal muscle in the methylation of individual CpG loci in all four genes studied. Methylation of individual Δ6fad_b CpG loci was negatively related to its expression and to proportions of 20:5n-3 and 22:6n-3 in the liver. These findings suggest variations in dietary FO can induce gene-, CpG locus-, and tissue-related changes in DNA methylation in salmon.
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Affiliation(s)
- Nicola A Irvine
- Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK
| | - Bente Ruyter
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210 1432, Ås, Norway
| | - Tone-Kari Østbye
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210 1432, Ås, Norway
| | - Anna K Sonesson
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210 1432, Ås, Norway
| | - Karen A Lillycrop
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton, UK
| | - Gerd Berge
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), Sjølsengveien 22, 6600 Sunndalsøra, Norway
| | - Graham C Burdge
- Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK
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Endogenous production of n-3 long-chain PUFA from first feeding and the influence of dietary linoleic acid and the α-linolenic:linoleic ratio in Atlantic salmon ( Salmo salar). Br J Nutr 2019; 122:1091-1102. [PMID: 31409428 DOI: 10.1017/s0007114519001946] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Atlantic salmon (Salmo salar) possess enzymes required for the endogenous biosynthesis of n-3 long-chain PUFA (LC-PUFA), EPA and DHA, from α-linolenic acid (ALA). Linoleic acid (LA) competes with ALA for LC-PUFA biosynthesis enzymes leading to the production of n-6 LC-PUFA, including arachidonic acid (ARA). We aimed to quantify the endogenous production of EPA and DHA from ALA in salmon fed from first feeding on diets that contain no EPA and DHA and to determine the influence of dietary LA and ALA:LA ratio on LC-PUFA production. Salmon were fed from first feeding for 22 weeks with three diets formulated with linseed and sunflower oils to provide ALA:LA ratios of approximately 3:1, 1:1 and 1:3. Endogenous production of n-3 LC-PUFA was 5·9, 4·4 and 2·8 mg per g fish and that of n-6 LC-PUFA was 0·2, 0·5 and 1·4 mg per g fish in salmon fed diets with ALA:LA ratios of 3:1, 1:1 and 1:3, respectively. The ratio of n-3:n-6 LC-PUFA production decreased from 27·4 to 2·0, and DHA:EPA ratio increased and EPA:ARA and DHA:ARA ratios decreased, as dietary ALA:LA ratio decreased. In conclusion, with a dietary ALA:LA ratio of 1, salmon fry/parr produced about 28 μg n-3 LC-PUFA per g fish per d, with a DHA:EPA ratio of 3·4. Production of n-3 LC-PUFA exceeded that of n-6 LC-PUFA by almost 9-fold. Reducing the dietary ALA:LA ratio reduced n-3 LC-PUFA production and EPA:ARA and DHA:ARA ratios but increased n-6 LC-PUFA production and DHA:EPA ratio.
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Andresen AMS, Lutfi E, Ruyter B, Berge G, Gjøen T. Interaction between dietary fatty acids and genotype on immune response in Atlantic salmon (Salmo salar) after vaccination: A transcriptome study. PLoS One 2019; 14:e0219625. [PMID: 31365530 PMCID: PMC6668776 DOI: 10.1371/journal.pone.0219625] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 06/27/2019] [Indexed: 01/23/2023] Open
Abstract
A pivotal matter to aquaculture is the sourcing of sustainable resources as ingredients to aquafeeds. Levels of plant delivered oils as source of fatty acids (FA) in aquafeeds have reached around 70% resulting in reduced levels of long-chain omega-3 polyunsaturated fatty acids (LC n-3 PUFA), such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), in salmon fillet composition. EPA and DHA can modulate inflammation and immune response, so it is crucial to understand how fish immune response is affected by low LC n-3 PUFA diet and if this diet can have a detrimental effect on vaccine response. Atlantic salmon (Salmo salar) can produce EPA/DHA from α-linolenic acid (ALA) and this endogenous capacity can be explored to develop families with higher tolerance to low LC n-3 PUFA diets. Here we analyze innate and adaptive immune response in Atlantic salmon to a commercial vaccine after being fed low levels of EPA and DHA, and we also compare three strains of salmon selected by their endogenous capacity of synthesizing LC- n-3 PUFA. A total of 2,890 differentially expressed genes (DEGs) were identified (p-value adjusted < 0.1) when comparing vaccinated fish against control non-vaccinated. Gene ontology (GO) and KEGG analysis with 442 up/downregulated genes revealed that most DEGs were both related to immune response as well as part of important immune related pathways, as "Toll-like receptor" and "Cytokine-Cytokine interaction". Adaptive response was also addressed by measuring antigen specific IgM, and titers were significantly higher than in the pre-immune fish at 62 days post-immunization. However, diet and strain had no/little effect on vaccine-specific IgM or innate immune responses. Atlantic salmon therefore display robustness in its response to vaccination even when feed low levels of LC n-3 PUFA.
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Affiliation(s)
| | - Esmail Lutfi
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), Ås, Norway
| | - Bente Ruyter
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), Ås, Norway
| | - Gerd Berge
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), Ås, Norway
| | - Tor Gjøen
- Department of Pharmacy, Section for Pharmacology and Pharmaceutical Biosciences, University of Oslo, Oslo, Norway
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Fickler A, Staats S, Michl SC, Hasler M, Rimbach G, Schulz C. Combination of Dietary Ahiflower Oil and Equol Enhances Long‐Chain Polyunsaturated Fatty Acid Levels in Rainbow Trout Tissues. Lipids 2019; 53:1069-1083. [DOI: 10.1002/lipd.12117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/18/2018] [Accepted: 12/18/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Anna Fickler
- GMA ‐ Gesellschaft für Marine Aquakultur mbH Hafentörn 3, 25761, Büsum Germany
- Institute of Animal Breeding and HusbandryKiel University Hermann‐Rodewald‐Str. 6, 24118, Kiel Germany
| | - Stefanie Staats
- Institute of Human Nutrition and Food ScienceKiel University Hermann‐Rodewald‐Str. 6, 24118, Kiel Germany
| | - Stéphanie Céline Michl
- GMA ‐ Gesellschaft für Marine Aquakultur mbH Hafentörn 3, 25761, Büsum Germany
- Institute of Animal Breeding and HusbandryKiel University Hermann‐Rodewald‐Str. 6, 24118, Kiel Germany
| | - Mario Hasler
- Lehrfach VariationsstatistikKiel University Hermann‐ Rodewald‐Str. 9, 24118 Kiel Germany
| | - Gerald Rimbach
- Institute of Human Nutrition and Food ScienceKiel University Hermann‐Rodewald‐Str. 6, 24118, Kiel Germany
| | - Carsten Schulz
- GMA ‐ Gesellschaft für Marine Aquakultur mbH Hafentörn 3, 25761, Büsum Germany
- Institute of Animal Breeding and HusbandryKiel University Hermann‐Rodewald‐Str. 6, 24118, Kiel Germany
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The effect of micronutrient supplementation on growth and hepatic metabolism in diploid and triploid Atlantic salmon (Salmo salar) parr fed a low marine ingredient diet. Comp Biochem Physiol B Biochem Mol Biol 2019; 227:106-121. [DOI: 10.1016/j.cbpb.2018.10.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 10/15/2018] [Indexed: 12/16/2022]
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12
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Gladyshev MI, Glushchenko LA, Makhutova ON, Rudchenko AE, Shulepina SP, Dubovskaya OP, Zuev IV, Kolmakov VI, Sushchik NN. Comparative Analysis of Content of Omega-3 Polyunsaturated Fatty Acids in Food and Muscle Tissue of Fish from Aquaculture and Natural Habitats. CONTEMP PROBL ECOL+ 2018. [DOI: 10.1134/s199542551803006x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Horn SS, Ruyter B, Meuwissen THE, Hillestad B, Sonesson AK. Genetic effects of fatty acid composition in muscle of Atlantic salmon. Genet Sel Evol 2018; 50:23. [PMID: 29720078 PMCID: PMC5932797 DOI: 10.1186/s12711-018-0394-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 04/24/2018] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The replacement of fish oil (FO) and fishmeal with plant ingredients in the diet of farmed Atlantic salmon has resulted in reduced levels of the health-promoting long-chain polyunsaturated omega-3 fatty acids (n-3 LC-PUFA) eicosapentaenoic (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3) in their filets. Previous studies showed the potential of selective breeding to increase n-3 LC-PUFA levels in salmon tissues, but knowledge on the genetic parameters for individual muscle fatty acids (FA) and their relationships with other traits is still lacking. Thus, we estimated genetic parameters for muscle content of individual FA, and their relationships with lipid deposition traits, muscle pigmentation, sea lice and pancreas disease in slaughter-sized Atlantic salmon. Our aim was to evaluate the selection potential for increased n-3 LC-PUFA content and provide insight into FA metabolism in Atlantic salmon muscle. RESULTS Among the n-3 PUFA, proportional contents of alpha-linolenic acid (ALA; 18:3n-3) and DHA had the highest heritability (0.26) and EPA the lowest (0.09). Genetic correlations of EPA and DHA proportions with muscle fat differed considerably, 0.60 and 0.01, respectively. The genetic correlation of DHA proportion with visceral fat was positive and high (0.61), whereas that of EPA proportion with lice density was negative. FA that are in close proximity along the bioconversion pathway showed positive correlations with each other, whereas the start (ALA) and end-point (DHA) of the pathway were negatively correlated (- 0.28), indicating active bioconversion of ALA to DHA in the muscle of fish fed high FO-diet. CONCLUSIONS Since contents of individual FA in salmon muscle show additive genetic variation, changing FA composition by selective breeding is possible. Taken together, our results show that the heritabilities of individual n-3 LC-PUFA and their genetic correlations with other traits vary, which indicates that they play different roles in muscle lipid metabolism, and that proportional muscle contents of EPA and DHA are linked to body fat deposition. Thus, different selection strategies can be applied in order to increase the content of healthy omega-3 FAin the salmon muscle. We recommend selection for the proportion of EPA + DHA in the muscle because they are both essential FA and because such selection has no clear detrimental effects on other traits.
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Affiliation(s)
- Siri S Horn
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210, 1432, Ås, Norway. .,Department of Animal and Aquaculture Sciences, Norwegian University of Life Sciences, 1430, Ås, Norway.
| | - Bente Ruyter
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210, 1432, Ås, Norway
| | - Theo H E Meuwissen
- Department of Animal and Aquaculture Sciences, Norwegian University of Life Sciences, 1430, Ås, Norway
| | | | - Anna K Sonesson
- Nofima (Norwegian Institute of Food, Fisheries and Aquaculture Research), PO Box 210, 1432, Ås, Norway
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14
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Sissener NH. Are we what we eat? Changes to the feed fatty acid composition of farmed salmon and its effects through the food chain. ACTA ACUST UNITED AC 2018. [PMID: 29514891 DOI: 10.1242/jeb.161521] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
'Are we what we eat?' Yes and no. Although dietary fat affects body fat, there are many modifying mechanisms. In Atlantic salmon, there is a high level of retention of the n-3 fatty acid (FA) docosahexaenoic acid (DHA, 22:6n-3) relative to the dietary content, whereas saturated FAs never seem to increase above a specified level, which is probably an adaptation to low and fluctuating body temperature. Net production of eicosapentaenoic acid (EPA, 20:5n-3) and especially DHA occurs in salmon when dietary levels are low; however, this synthesis is not sufficient to maintain EPA and DHA at similar tissue levels to those of a traditional fish oil-fed farmed salmon. The commercial diets of farmed salmon have changed over the past 15 years towards a more plant-based diet owing to the limited availability of the marine ingredients fish meal and fish oil, resulting in decreased EPA and DHA and increased n-6 FAs. Salmon is part of the human diet, leading to the question 'Are we what the salmon eats?' Dietary intervention studies using salmon have shown positive effects on FA profiles and health biomarkers in humans; however, most of these studies used salmon that were fed high levels of marine ingredients. Only a few human intervention studies and mouse trials have explored the effects of the changing feed composition of farmed salmon. In conclusion, when evaluating feed ingredients for farmed fish, effects throughout the food chain on fish health, fillet composition and human health need to be considered.
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Affiliation(s)
- Nini H Sissener
- Fish Nutrition, Requirements and Welfare, Institute of Marine Research (IMR), Postboks 1870 Nordnes, 5817 Bergen, Norway
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Early nutritional intervention can improve utilisation of vegetable-based diets in diploid and triploid Atlantic salmon (Salmo salar L.). Br J Nutr 2017; 118:17-29. [PMID: 28735572 PMCID: PMC5565931 DOI: 10.1017/s0007114517001842] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The present study investigated nutritional programming in Atlantic salmon to improve utilisation of a vegetable-based diet. At first exogenous feeding, fry were fed either a marine-based diet (Diet Mstimulus, 80% fishmeal (FM)/4% fish oil (FO)) or a vegetable-based diet (Diet Vstimulus, 10% FM/0% FO) for 3 weeks. Subsequently, all fish were then fed under the same conditions with a commercial, marine-based, diet for 15 weeks and thereafter challenged with a second V diet (Diet Vchallenge, 10% FM/0% FO) for 6 weeks. Diploid and triploid siblings were run in parallel to examine ploidy effects. Growth performance, feed intake, nutrient utilisation and intestinal morphology were monitored. Fish initially given Diet Vstimulus (V-fish) showed 24 % higher growth rate and 23 % better feed efficiency compared with M-fish when later challenged with Diet Vchallenge. There was no difference in feed intake between nutritional histories, but increased nutrient retentions highlighted the improved utilisation of a V diet in V-fish. There were generally few significant effects of nutritional history or ploidy on enteritis scores in the distal intestine after the challenge phase as only V-triploids showed a significant increase (P<0·05) in total score. The data highlighted that the positive effects were most likely a result of nutritional programming and the ability to respond better when challenged later in life may be attributed to physiological and/or metabolic changes induced by the stimulus. This novel study showed the potential of nutritional programming to improve the use of plant raw material ingredients in feeds for Atlantic salmon.
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16
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Requirements ofn-3 very long-chain PUFA in Atlantic salmon (Salmo salarL): effects of different dietary levels of EPA and DHA on fish performance and tissue composition and integrity. Br J Nutr 2017; 117:30-47. [DOI: 10.1017/s0007114516004396] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
AbstractFarmed salmon feeds have changed from purely marine-based diets with high levels of EPA and DHA in the 1990s to the current 70 % plant-based diets with low levels of these fatty acids (FA). The aim of this study was to establish the impacts of low dietary EPA and DHA levels on performance and tissue integrity of Atlantic salmon (Salmo salar). Atlantic salmon (50 g) in seawater were fed fourteen experimental diets, containing five levels (0, 0·5, 1·0, 1·5 and 2·0 %) of EPA, DHA or a 1:1 EPA+DHA plus control close to a commercial diet, to a final weight of 400 g. Lack of EPA and DHA did not influence mortality, but then-3-deficient group exhibited moderately slower growth than those fed levels above 0·5 %. The heart and brain conserved EPA and DHA levels better than skeletal muscle, liver, skin and intestine. Decreased EPA and DHA favoured deposition of pro-inflammatory 20 : 4n-6 and 20 : 3n-6 FA in membrane phospholipids in all tissues. When DHA was excluded from diets, 18 : 3n-3 and EPA were to a large extent converted to DHA. Liver, skeletal and cardiac muscle morphology was normal in all groups, with the exception of cytoplasm packed with large or foamy vacuoles and sometimes swollen enterocytes of intestine in both deficient and EPA groups. DHA supplementation supported normal intestinal structure, and 2·0 % EPA+DHA alleviated deficiency symptoms. Thus, EPA and DHA dietary requirements cannot be based exclusively on growth; tissue integrity and fish health also need to be considered.
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Sanden M, Liland NS, Sæle Ø, Rosenlund G, Du S, Torstensen BE, Stubhaug I, Ruyter B, Sissener NH. Minor lipid metabolic perturbations in the liver of Atlantic salmon (Salmo salar L.) caused by suboptimal dietary content of nutrients from fish oil. FISH PHYSIOLOGY AND BIOCHEMISTRY 2016; 42:1463-1480. [PMID: 27154233 DOI: 10.1007/s10695-016-0233-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 04/29/2016] [Indexed: 06/05/2023]
Abstract
The present study was conducted to evaluate the effects on Atlantic salmon hepatic lipid metabolism when fed diets with increasing substitution of fish oil (FO) with a vegetable oil (VO) blend. Four diets with VOs replacing 100, 90, 79 and 65 % of the FO were fed for 5 months. The levels of eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3) in the experimental diets ranged from 1.3 to 7.4 % of fatty acids (FAs), while cholesterol levels ranged from 0.6 to 1.2 g kg(-1). In hepatocytes added [1-(14)C] α-linolenic acid (ALA, 18:3n-3), more ALA was desaturated and elongated to EPA and DHA in cells from fish fed 100 % VO, while in fish fed 65 % VO, ALA was elongated to eicosatrienoic acid (ETE; 20:3n-3), indicating reduced Δ6 desaturation activity. Despite increased desaturation activity and activation of the transcription factor Sp1 in fish fed 100 % VO, liver phospholipids contained less EPA and DHA compared with the 65 % VO group. The cholesterol levels in the liver of the 100 % VO group exceeded the levels in fish fed the 65 % VO diet, showing an inverse relationship between cholesterol intake and liver cholesterol content. For the phytosterols, levels in liver were generally low. The area as a proxy of volume of lipid droplets was significantly higher in salmon fed 100 % VO compared with salmon fed 65 % VO. In conclusion, the current study suggests that suboptimal dietary levels of cholesterol in combination with low levels of EPA and DHA (1.3 % of FAs) can result in minor metabolic perturbations in the liver of Atlantic salmon.
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Affiliation(s)
- Monica Sanden
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway.
| | - Nina S Liland
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway
| | - Øystein Sæle
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway
| | | | - Shishi Du
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway
| | - Bente E Torstensen
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway
| | | | | | - Nini H Sissener
- National Institute of Nutrition and Seafood Research (NIFES), P.O. Box 2029, Nordnes, 5817, Bergen, Norway
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Nuez-Ortín WG, Carter CG, Wilson R, Cooke I, Nichols PD. Preliminary Validation of a High Docosahexaenoic Acid (DHA) and α-Linolenic Acid (ALA) Dietary Oil Blend: Tissue Fatty Acid Composition and Liver Proteome Response in Atlantic Salmon (Salmo salar) Smolts. PLoS One 2016; 11:e0161513. [PMID: 27556399 PMCID: PMC4996530 DOI: 10.1371/journal.pone.0161513] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 08/05/2016] [Indexed: 11/24/2022] Open
Abstract
Marine oils are important to human nutrition as the major source of docosahexaenoic acid (DHA), a key omega-3 long-chain (≥C20) polyunsaturated fatty acid (n-3 LC-PUFA) that is low or lacking in terrestrial plant or animal oils. The inclusion of fish oil as main source of n-3 LC-PUFA in aquafeeds is mostly limited by the increasing price and decreasing availability. Fish oil replacement with cheaper terrestrial plant and animal oils has considerably reduced the content of n-3 LC-PUFA in flesh of farmed Atlantic salmon. Novel DHA-enriched oils with high alpha-linolenic acid (ALA) content will be available from transgenic oilseeds plants in the near future as an alternative for dietary fish oil replacement in aquafeeds. As a preliminary validation, we formulated an oil blend (TOFX) with high DHA and ALA content using tuna oil (TO) high in DHA and the flaxseed oil (FX) high in ALA, and assessed its ability to achieve fish oil-like n-3 LC-PUFA tissue composition in Atlantic salmon smolts. We applied proteomics as an exploratory approach to understand the effects of nutritional changes on the fish liver. Comparisons were made between fish fed a fish oil-based diet (FO) and a commercial-like oil blend diet (fish oil + poultry oil, FOPO) over 89 days. Growth and feed efficiency ratio were lower on the TOFX diet. Fish muscle concentration of n-3 LC-PUFA was significantly higher for TOFX than for FOPO fish, but not higher than for FO fish, while retention efficiency of n-3 LC-PUFA was promoted by TOFX relative to FO. Proteomics analysis revealed an oxidative stress response indicative of the main adaptive physiological mechanism in TOFX fish. While specific dietary fatty acid concentrations and balances and antioxidant supplementation may need further attention, the use of an oil with a high content of DHA and ALA can enhance tissue deposition of n-3 LC-PUFA in relation to a commercially used oil blend.
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Affiliation(s)
- Waldo G. Nuez-Ortín
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia
- CSIRO Food Nutrition and Bio-based Products, Oceans & Atmosphere, GPO Box 1538, Hobart, TAS 7001, Australia
- * E-mail:
| | - Chris G. Carter
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia
| | - Richard Wilson
- Central Science Laboratory, University of Tasmania, Bag 74, Hobart, TAS 7001, Australia
| | - Ira Cooke
- Department of Molecular and Cell Biology, James Cook University, Townsville, QLD 4811, Australia
| | - Peter D. Nichols
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia
- CSIRO Food Nutrition and Bio-based Products, Oceans & Atmosphere, GPO Box 1538, Hobart, TAS 7001, Australia
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Pike IH, Tocher DR. Could an El Niño event put dietary supplies of n-3 long-chain polyunsaturated fatty acids (EPA and DHA) in jeopardy. EUR J LIPID SCI TECH 2016. [DOI: 10.1002/ejlt.201400647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Douglas R. Tocher
- Institute of Aquaculture, School of Natural Sciences; University of Stirling; Stirling UK
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20
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Atlantic salmon require long-chain n-3 fatty acids for optimal growth throughout the seawater period. J Nutr Sci 2016; 5:e19. [PMID: 27293556 PMCID: PMC4891698 DOI: 10.1017/jns.2016.10] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Accepted: 03/02/2016] [Indexed: 12/28/2022] Open
Abstract
The nutritional requirement for n-3 long-chain PUFA in fast-growing
Atlantic salmon (Salmo salar) during grow out in the sea is not well
documented. Diets were formulated with levels of EPA (20 : 5n-3) and DHA
(22 : 6n-3) ranging from 1·3 to 7·4 % of fatty acids (4–24 g/kg feed).
Two long-term trials were conducted through the seawater phase, the first at 6 and 12°C,
and the second at 12°C. In the first trial, growth at both temperatures was significantly
lower in fish fed 1·4 % EPA+DHA of total fatty acids compared with the 5·2 % EPA+DHA
group. In the second trial, growth was significantly lower in fish fed 1·3 and 2·7 %
compared with 4·4 and 7·4 % EPA + DHA. Fatty acid composition in the fish reflected diet
composition, but only after a 7-fold increase in body weight did the fatty acid profile of
the fish stabilise according to dietary fatty acids (shown for EPA and DHA). The retention
efficiency of DHA increased with decreasing dietary levels, and was 120–190 and 120–200 %
in trials 1 and 2, respectively. The retention efficiency of EPA was lower (60–200 %), and
values >100 % were only achieved at the lowest dietary levels in both trials.
Temperature did not affect fatty acid retention efficiency. These results suggest that
Atlantic salmon have a specific requirement for EPA + DHA >2·7 % of fatty acids for
optimal long-term growth in seawater, and that short-term growth trials with less weight
increase would not show these effects.
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Key Words
- Atlantic salmon
- BW, body weight
- EFA, essential fatty acid
- FA, fatty acid
- FCR, feed conversion ratio
- FO, fish oil
- Fish requirements
- Growth performance in seawater
- LC-PUFA, long-chain PUFA
- LNA, α-linolenic acid
- PL, phospholipid
- SGR, specific growth rate
- TGC, thermal growth coefficient
- VO, vegetable oil
- n-3 Fatty acids
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Pike IH. Fish oil: Supply and demand as a source of long‐chain n‐3 polyunsaturated fatty acids in the human diet. EUR J LIPID SCI TECH 2015. [DOI: 10.1002/ejlt.201400648] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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