EFFECTS OF SUPPLEMENTATION OF YELLOW SILK COTTON FLOWERS POWDER IN THE DIET ON THE GROWTH AND COLOR OF GOLDFISH
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The objective of this study was to evaluate the effects of supplementing Marigold flower powder (Cochlospermum regium) in the diet on the growth and coloration of goldfish (Carassius auratus). The experiment was conducted using a completely randomized design with four treatments: control (0%) and diets supplemented with 1.5%, 3%, and 5% Marigold flower powder, each with three replicates. All diets contained 40% protein, and fish were fed twice daily (09:00–10:00 and 15:00–16:00) for 10 weeks. Fish were randomly weighed and measured for color parameters every two weeks, including lightness (L*), redness (a*), and yellowness (b*), to assess growth performance and color quality. At the end of the experiment, dietary supplementation with Marigold flower powder did not significantly affect growth performance or survival rate (p > .05). However, fish fed diets supplemented with Marigold flower powder at all levels exhibited significantly higher lightness (L*), redness (a*), and yellowness (b*) compared to the control (p > .05). Notably, fish receiving 5% supplementation showed the highest color values, which can be attributed to the high carotenoid content in Marigold flower (28.91(0.43) mg ß-carotene/g), acting as a natural coloring agent. This resulted in brighter and more vivid overall coloration. These findings indicated that Marigold flower powder could effectively enhance goldfish coloration and had potential for development as a commercial feed for ornamental fish.
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