Abstract:Colouring has a great influence on the commercialization of ornamental fish. The aim of this study was to evaluate different concentrations of canthaxanthin in the diet of the blood swordtail Xiphophorus helleri in an effort to obtain a more intense red colour. Six concentrations of canthaxanthin (0, 50, 100, 250, 400 and 600 mg kg À1 diet) were used. The experiment lasted 60 days. Fish were evaluated for increased red pigmentation through the use of photographs (performed by smartphone) and imaging applicatio… Show more
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