Finally, on day 10 fish demanded a significantly higher percentage (82%) of D1. During the first nine days of the trial, fish took similar amounts of D1 and D2, although there was a clear tendency to gradually avoid D2. Six groups of 4 fish (254 g initial wet weight) were allowed to be selected by means of self-feeders between two complete diets (34.5% casein + gelatin, 14.8% fish oil + soybean oil, 24.8% dextrin and 25.9% vitamins, minerals, filler and binder) which differed only in the oxidation level of the lipid source: 6.2 meq/kg for the control (D1) and 100.0 meq/kg for the oxidized diet (D2). The present research looked at the ability of gilthead seabream to discriminate between two similar diets differing only in the extent of lipid oxidation.
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