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In this pulse-chase study, rainbow trout fed a diet containing deuterated (D5) (17,17,18,18,18)-18∶3n−3 ethyl ester accumulated D5-22∶6n−3 in pyloric ceca to a greater extent than in liver 2 d post-dose. The ratio of newly synthesized D5-22∶6n−3 in ceca to that in liver 2 d after feeding D5-18∶3n−3 was 4.7±1.2 when expressed as per mg tissue and 5.2±2.4 when expressed as per mg protein. The amount...
Rainbow trout (Oncorhynchus mykiss) weighing ca. 5 g and previously acclimated for 8 wk on a diet comprising vegetable oil (11%), fish meal (5%), and casein (48%) as the major constituents were fed a pulse of diet containing deuterated (D5) (17,17,18,18,18)-18∶3n−3 ethyl ester. The synthesis and tissue distribution of D5-22∶6n−3 was determined 3,7,14, 24, and 35 d after the pulse. The whole-body accumulation...
Octadecapentaenoic acid (all-cis δ3,6,9,12,15–18∶5; 18∶5n−3) is an unusual fatty acid found in marine dinophytes, haptophytes, and prasinophytes. It is not present at higher trophic levels in the marine food web, but its metabolism by animals ingesting algae is unknown. Here we studied the metabolism of 18∶5n−3 in cell lines derived from turbot (Scophthalmus maximus), gilthead sea bream (Sparus aurata...
Hepatocytes isolated from rainbow trout fed on diets containing either fish oil or olive oil were incubated with individual odd-chain length unsaturated fatty acids (19∶1n−9, 19∶2n−6, 19∶3n−3, 21∶2n−6, 21∶3n−6, 21∶4n−6, 21∶3n−3, and 21∶5n−3) to examine whether these fatty acids were substrates for modification by desaturation and elongation. All odd-chain length fatty acids were readily assimilated...