Three hundred rainbow trout (242.9 ± 6.9 g) were randomly assigned to 12 fibreglass tanks (25 fish/tank). The fish were
fed, for 231 days (feeding level: 0.74 % average bw), four experimental diets, containing increasing levels of coconut
oil: diet A 0 %, diet B 6 %; diet C 12 % and diet D 13 %, as replacements of herring oil and cod liver oil. Weight gains
of fish were > 3 g d-1 and FCR lower than 1.5, for all treatments. No significant difference was observed in the main carcass
traits and whole body composition, but whole fish energy content significantly increased in fish fed diet D (10.68 KJ
g-1). Different dietary fatty acid profiles had significant effects on the rainbow trout muscle contents of C10:0, C12:0,
C14:0, total n-3, and the main ratios: SFA/USFA; DHA/EPA; DHA/AA, n-3/n-6, but not on total fatty acids content of the
muscle.
