Fillet yield and chemical composition of farm-raised sunshine bass (Morone chrysops♀ × Morone saxatilis♂) fed high-energy diets |
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| Authors: | U. Luzzana,M. Scolari,B. Campo Dall'Orto,F. A. Vaini,N. Nargaye,& F. Valfrè |
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| Affiliation: | A.S.A. s.r.l. –Agridea, Servizio Nutrizione, San Martino Buon Albergo (VR), Italy,;Nuova Azzurro S.p.A., Verona, Italy,;Universitàdegli Studi di Milano, Facoltàdi Medicina Veterinaria, Istituto di Zootecnica, Milano, Italy,;Agroittica Lombarda S.p.A., Viadana di Calvisano (BS), Italy |
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| Abstract: | Fillet yield and chemical composition were evaluated in small, medium and large (about 150, 350 and 700 g, respectively) size classes of sunshine bass ( Morone chrysops ♀ × Morone saxatilis ♂) fed high-energy diets. Fish size had a major effect on the fillet yield, which was significantly higher (38.8 vs. 33.4–34.6%) in fish belonging to the medium-size class. The lipid contents of both whole and skinned fillets were higher than those reported in the literature, ranging from 7.8 to 10.6% in whole fillets and from 5.9 to 7.6% in skinned fillets, thereby allowing classification of sunshine bass fed high-energy diets as a medium-fat fish. A significant effect of fish size on lipid content was found only for whole fillets, therefore indicating that dietary energy excess in larger fish is mainly stored as subdermal fat. The dietary fatty acid profile was found to be the major determinant of edible muscle lipid composition in all size-classes considered. The cholesterol content of muscle tissue ranged from 23 to 29 mg/100 g tissue. |
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