Ruff N ; Fitzgerald R ; Cross T ; Lynch A ; Kerry J ;

Aquaculture Nutrition vol. 10 (2)   pp. 75-81, Avr 2004

Department of Food and Nutritional Sciences, National University of Ireland, Cork, Ireland,
joe.kerry@ucc.ie

The present study investigated the distribution of alpha -tocopherol (vitamin E) in fillets of turbot (Scophthalmus maximus) and Atlantic halibut (Hippoglossus hippoglossus). Turbot and Atlantic halibut were fed commercial diets, supplemented with different levels of alpha -tocopheryl acetate at the dietary target levels of 100, 500 and 1000 mg alpha -tocopheryl acetate kg super(-1) diet. The actual levels were 72, 547 and 969 for turbot, while halibut received 189, 613 and 875 mg alpha -tocopheryl acetate kg super(-1) diet. Turbot were fed the diets for 24 weeks, while Atlantic halibut were fed for 20 weeks prior to slaughter. At the end of the feeding periods fish had reached a final weight of around 1 kg. Fish were slaughtered and filleted. From the four fillets obtained per fish, 22 samples were taken from designated areas and analysed for their alpha -tocopherol content. The average concentrations of alpha -tocopherol incorporated in turbot and Atlantic halibut increased with increasing levels of alpha -tocopheryl acetate in the diet. Atlantic halibut had significantly (P < 0.05) more alpha -tocopherol in positions 2 /II and 1/I than in position 9/IX. Turbot had significantly (P < 0.05) more alpha -tocopherol in position 2/II than in positions 1 /I, 4/IV and 11/XI. By mapping alpha -tocopherol concentrations in fish fillets, a high degree of quality prediction may be established. Moreover, this study may help scientists in their choice of sampling position, when investigating if alpha -tocopheryl acetate supplementation resulted in successful alpha -tocopherol incorporation

Feed composition ;  Animal nutrition ;  Feeding experiments ;  Vitamin E ;  Diets ;  Fish fillets ;  Chemical composition ;  Aquaculture products ;  Nutritive value ;  Bioaccumulation ;  Scophthalmus maximus ;  Hippoglossus hippoglossus ; 

Consulter l'article complet ...