John R. Sargent
University of Stirling
Publications 220
#1John R. SargentH-Index: 73
#2J.G. BellH-Index: 42
Last.Douglas R. TocherH-Index: 76
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138 CitationsSource
#1Stig Falk-Petersen (Norwegian College of Fishery Science)H-Index: 51
#2Patrick Mayzaud (CNRS: Centre national de la recherche scientifique)H-Index: 27
Last.John R. Sargent (University of Stirling)H-Index: 73
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Abstract The three Arctic Calanus species, C. finmarchicus (Gunnerus, 1765), C. glacialis (Jaschov, 1955), and C. hyperboreus, are the most important herbivores in Arctic seas in terms of species biomass. They play a key role in the lipid-based energy flux in the Arctic, converting low-energy carbohydrates and proteins in ice algae and phytoplankton into high-energy wax esters. In this paper we review the over-wintering strategy, seasonal migration, stage development, life span, feeding strategy...
247 CitationsSource
#1Stig Falk-Petersen (NPI: Norwegian Polar Institute)H-Index: 51
#2Vladimir Pavlov (NPI: Norwegian Polar Institute)H-Index: 11
Last.John R. Sargent (University of Stirling)H-Index: 73
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141 CitationsSource
Atlantic salmon (Salmo salar L.) juveniles were fed either 100% fish oil (FO), 75% vegetable oil (VO), or 100% VO throughout their life cycle to harvest weight followed by a finishing diet period when all groups were fed 100% FO. The two experimental VO diets were tested at two different locations (Scotland and Norway) against the same control diet (100% FO). The VO blend was composed of rapeseed oil, palm oil, and linseed oil using capelin oil as a control for fatty acid class compositions. Fle...
268 CitationsSource
#1J. Gordon Bell (University of Stirling)H-Index: 45
#2R. James Henderson (University of Stirling)H-Index: 21
Last.John R. Sargent (University of Stirling)H-Index: 73
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Five groups of salmon, of initial mean weight 127±3 g, were fed increasing levels of dietary linseed oil (LO) in a regression design. The control diet contained capelin oil (FO) only, and the same oil was blended with LO to provide the experimental diets. After an initial period of 40 wk, all groups were switched to a finishing diet containing only FO for a further 24 wk. Growth and flesh lipid contents were not affected by dietary treatment. The FA compositions of flesh total lipids were linear...
221 CitationsSource
#1Ana Farías (Austral University of Chile)H-Index: 14
#2J.G. Bell (University of Stirling)H-Index: 42
Last.John R. Sargent (University of Stirling)H-Index: 73
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Abstract The composition of lipids and fatty acids of larval scallop Argopecten purpuratus were determined when cultured at one of two temperatures and using one of the three algal diets. Larvae grown at 12 °C had the lowest values of phosphatidylcholine (PC) and highest values of cholesterol and steryl esters (SE). The ratio of triacylglycerol (TAG)/cholesterol was affected by temperature but not by diet and the lowest values were observed in larvae grown at 12 °C. By using the ratio of TAG/cho...
31 CitationsSource
#1J.G. Bell (University of Stirling)H-Index: 42
#2L.A. McEvoyH-Index: 14
Last.John R. Sargent (University of Stirling)H-Index: 73
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Although global production of flatfish has increased in recent years, both in terms of numbers of fish and diversification into new species, problems still remain with low survival rates and difficulties with metamorphosis. This short review highlights some advances made in optimising lipid nutrition in an attempt to overcome some of these problems. Copepod nauplii are the best live prey for first-feeding flatfish larvae. Rotifers can provide a useful method of essential fatty acid delivery but ...
211 CitationsSource
#1J. Gordon Bell (University of Stirling)H-Index: 45
#2Fiona McGhee (University of Stirling)H-Index: 8
Last.John R. Sargent (University of Stirling)H-Index: 73
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Abstract Duplicate groups of Atlantic salmon post-smolts were fed five practical-type diets in which the added oil was 100% fish oil (FO)/0% rapeseed oil (0% RO), 90% FO/10% RO (10% RO), 75% FO/25% RO (25% RO), 50% FO/50% RO (50% RO) or 100% RO for 16 weeks. After sampling, the remaining fish were switched to a commercial grower diet containing FO as the only added lipid for a further 12 weeks. There were no effects of the inclusion of RO on growth or feed conversion. Fatty acid compositions of ...
232 CitationsSource
#1J. Gordon Bell (University of Stirling)H-Index: 45
#2John R. Sargent (University of Stirling)H-Index: 73
The importance of arachidonic acid (20:4n6, ARA) in fish nutrition has tended to be overlooked in preference to eicosapentaenoic (20:5n3, EPA) and docosahexaenoic acids (22:6n3, DHA), probably due to the predominance of the latter two HUFA in fish tissues. However, despite the abundance of EPA and DHA in fish tissues, the importance of ARA as the primary eicosanoid precursor has been recognised for some time. Only very recently has the relative importance of ARA been given due acknowledgement an...
350 CitationsSource
Lipid class and fatty acid compositions were determined in common eider (Somateria mollissima), black-legged kittiwake (Rissa tridactyla) and northern fulmar (Fulmarus glacialis) from Kongsfjorden, Spitsbergen. Muscle and liver were sampled in all species, while fat tissue was sampled in eiders and fulmars. Triacylglycerols (TAG) dominated the lipid class compositions of all tissues, and the major fatty acids found in TAG were: 18:1n9, 16:0, 18:0, 20:5n3 and 16:1n7 for eider; 16:0, 18:1n9, 18:0,...
89 CitationsSource