One of the most frequent forms of natural pigments, carotenoids, may affect the colour of living creatures. There are around 750 different types of carotenoids. Carotenoids are found in modest amounts in most species. However, it is predicted that there are more than 100 million tonnes of carotenoids in nature. Carotenoids are responsible for the colour of ornamental fish's skin and the pigmentation of their muscles. Fish, like all other animals, are unable to de novo synthesis of carotenoids and must rely on their diet for carotenoids. Successful ornamental fish cultivation in a limited area relies heavily on properly prepared feed. The goal of this review study is to stress the relevance of carotenoids in ornamental fish keeping.

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