Olive Pomace and Soybean-Sunflower Acid Oils as Alternative Fat Sources in European Seabass (Dicentrarchus labrax) Diets: Effects on Performance, Digestibility and Flesh Fatty Acid Composition and Quality Parameters
2022
Gerard Verge-Mèrida | Ana Cristina Barroeta | Carlos Ferrer | Tània Serrano | Francesc Guardiola | María Dolores Soler | Roser Sala
The effects of dietary inclusion of soybean-sunflower and olive pomace acid oils on growth, digestibility and flesh composition were studied in European seabass. Eight diets were fed for 100 days (101.37 ±: 0.33 g initial weight, mean ±: SD), differing in the added fat source (25% fish oil, 75% experimental oil): S (crude soybean oil), SA (soybean-sunflower acid oil), O (crude olive pomace oil) or OA (olive pomace acid oil): 3 blends: S-O, S-OA, SA-OA at a 1:1 ratio: and a diet containing only fish oil (F) as a control. Animals fed OA showed the worst performance among dietary treatments, with the lowest weight, specific growth ratio, average daily gain and the highest feed conversion ratio (p <: 0.01). In contrast, other diets including acid oils did not impair performance. Acid oil diets did not affect the apparent digestibility of dry matter, crude protein or total fatty acids (p >: 0.05), but a lower digestibility of lipids and saturated fatty acids was observed (p <: 0.001). Flesh composition and fatty acid profile were not affected by the high dietary free FA content (p >: 0.05). Hence the results suggest that the studied acid oils may potentially be used in fish diets although further studies are needed.
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