Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Polyunsaturated fatty acid metabolism in Atlantic salmon (Salmo salar) undergoing parr-smolt transformation and the effects of dietary linseed and rapeseed oils
Autore:
Tocher, DR; Bell, JG; Dick, JR; Henderson, RJ; McGhee, F; Michell, D; Morris, PC;
Indirizzi:
Univ Stirling, Inst Aquaculture, Stirling FK9 4LA, Scotland Univ StirlingStirling Scotland FK9 4LA ture, Stirling FK9 4LA, Scotland Marine Harvest McConnell Ltd, Ft William PH33 7PT, Highland, Scotland Marine Harvest McConnell Ltd Ft William Highland Scotland PH33 7PT otland Trouw Aquaculture, Renfrew Mill, Renfrewshire PA4 8BF, Strathclyde, Scotland Trouw Aquaculture Renfrewshire Strathclyde Scotland PA4 8BF yde, Scotland
Titolo Testata:
FISH PHYSIOLOGY AND BIOCHEMISTRY
fascicolo: 1, volume: 23, anno: 2000,
pagine: 59 - 73
SICI:
0920-1742(200007)23:1<59:PFAMIA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCOPHTHALMUS-MAXIMUS; LIPID-COMPOSITION; STEELHEAD TROUT; PROSTAGLANDIN-E2; SMOLTIFICATION; EICOSANOIDS; GAIRDNERI; MEMBRANE; TURBOT;
Keywords:
desaturase; osmoregulation; parr-smolt transformation; prostaglandin; PUFA; salmon; smoltification;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Tocher, DR Univ Stirling, Inst Aquaculture, Stirling FK9 4LA, Scotland Univ Stirling Stirling Scotland FK9 4LA ing FK9 4LA, Scotland
Citazione:
D.R. Tocher et al., "Polyunsaturated fatty acid metabolism in Atlantic salmon (Salmo salar) undergoing parr-smolt transformation and the effects of dietary linseed and rapeseed oils", FISH PHYS B, 23(1), 2000, pp. 59-73

Abstract

Duplicate groups of Atlantic salmon parr were fed diets containing either fish oil (FO), rapeseed oil (RO), linseed oil (LO) or linseed oil supplemented with arachidonic acid (20:4n-6; AA) (LOA) from October (week 0) to seawater transfer in March (week 19). From March to July (weeks 20-34) all fishwere fed a fish oil-containing diet. Fatty acyl desaturation and elongation activity in isolated hepatocytes incubated with [1-C-14]18:3n-3 increasedin all dietary groups, peaking in early March about one month prior to seawater transfer. Desaturation activities at their peak were significantly greater in fish fed the vegetable oils, particularly RO, compared to fish fedFO. Docosahexaenoic acid (22:6n-3:DHA) and AA in liver and gill polar lipids (PL) increased in all dietary groups during the freshwater phase whereaseicosapentaenoic acid (20:5n-3; EPA) increased greatly in all groups afterseawater transfer. The AA/EPA ratio in tissue PL increased up to seawater transfer and then decreased after transfer. AA levels and the AA/EPA ratio in gill PL were generally higher in the LOA group. The levels of 18:3n-3 inmuscle total lipid were increased significantly in the LO, LOA and, to a lesser extent, RO groups prior to transfer but were reduced to initial levels by the termination of the experiment (week 34). In contrast, 18:2n-6 in muscle total lipid was significantly increased after 18 weeks in fish fed the diets supplemented with RO and LO, and was significantly greater in the FO and RO groups at the termination of the experiment. Gill PGF production showed a large peak about two months after transfer to seawater. The production of total PGF post-transfer was significantly lower in fish previously fed the LOA diet. However, plasma chloride concentrations in fish subjected to a seawater challenge at 18 weeks were all lower in fish fed the diets with vegetable oils. This effect was significant in the case of fish receiving the diet with LOA, compared to those fed the diet containing FO. The present study showed that during parr-smolt transformation in Atlantic salmon there is a pre-adaptive increase in hepatocyte fatty acyl desaturation/elongation activities that is controlled primarily by environmental factors suchas photoperiod and temperature but that can also be significantly modulated by diet. Feeding salmon parr diets supplemented with rapeseed or linseed oils prevented inhibition of the desaturase activities that is induced by feeding parr diets with fish oils and thus influenced the smoltification process by altering tissue PL fatty acid compositions and eicosanoid production. These effects, in turn, had a beneficial effect on the ability of the fish to osmoregulate and thus adapt to salinity changes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:46:46