Effect of dietary lipid on fatty acid composition of the muscle of reared Tunisian greater amberjack Seriola dumerili

  • Gam Haouas W
  • Guerbej H
  • Zayene N
 et al. 
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Abstract

The greater amberjack Seriola dumerili (Risso, 1810) is one of the most commercially important seawater
fish species in Tunisia. The aim of this study was to determine the best rate of dietary lipid for Seriola dumerili during the
refining period and its effect on muscle fatty acid composition. Two groups of fish were fed for 8 weeks with commercial
diets with increasing lipid levels (45% crude protein, 17 or 25% lipid). The fat content and fatty acid composition of edible
muscle were investigated. The lipid content increased with increasing dietary lipid levels. Fatty acid (FA) composition of
the muscle reflected dietary FA profiles. Along the experiment, polyunsaturated fatty acid (PUFA) levels of Seriola dumerili
were found to be higher than those of saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) for the two
diets tested. The proportions of n-3 PUFAs of Seriola dumerili (ranging from 19.24 ± 0.98% to 29.15 ± 0.49% and
33.89 ± 0.94% for fish fed the 17% fat diet and the 25% fat diet, respectively) were higher than those of n-6 PUFAs.
Docosahexaenoic acid (DHA 22:6 n-3), eicosapentaenoic acid (EPA 20:5 n-3) and arachidonic acid (AA 20:4 n-6) were the
main PUFA. Farmed Seriola dumerili was characterised by a higher n-3/n-6 ratio in different samples studied and diet tested,
but the best ratio was observed with the lipid rich diet at 45 days of refining. Greater amberjack provides the consumer
with a high proportion of n-3 FA, particularly DHA and EPA

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  • SGR: 77955692895
  • PUI: 359364177
  • ISSN: 03990974
  • SCOPUS: 2-s2.0-77955692895

Authors

  • Wafa Gam Haouas

  • Hamadi Guerbej

  • Nesrine Zayene

  • Mohamed Hammami

  • Lotfi Achour

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