The aim of the present study was to assess the effect of diets supplemented with shrimp-head silage on the incorporation of n-3 in the Nile tilapia fillets. EPA (eicosapentaenoic), DHA (docosahexanoic) and total lipids were determined by chromatography in feeds and the muscles of tilapia specimens were submitted to diets supplemented with a varying degree of silage (0, 4, 8, 12, 16%). The total lipid content ranged from 6.70 to 10.30% in the diets and from 0.79 to 1.37% in the tilapia fillets. In diet with high concentration of silage, it was observed an increase in the level of omega-3 (r=0.92). There was an incorporation of 0.59% (1.34mg 100g-1) and 9.5% (40.50mg 100g-1) of EPA and DHA, respectively, when the addition of silage to the diet was 16%. The results implication states that the inclusion of 16% of the shrimp head silage in the diet for tilapias increases the levels of incorporation of EPA and DHA in the filet.
silage; nutrition; Litopenaeus vannamei; tilapia; Oreochromis niloticus
