The current work should be of immediate interest to pet feed manufacturers who service customers who keep their fish in clear water aquaria. The coloration of pet fish will fade if the fish are not provided with carotenoids.Traditionally, manufacturers have used complex formulations which may result in reduced palatability when introducing carotenoids into their feeds. The current work may also be of interest to ornamental fish feeds manufacturers who service growers with grazed down or otherwise clearwater systems, but it should be noted that ornamental fish growers do not use large amounts of feed because their fish are small.The largest market for the enhancement formulas may be food fish growers who wish to color the flesh of their fish or who grow fish such as the red sea bream that lose their coloration under culture. The algae described here work well to provide color and also offer advantages in application. They may be used to topcoat other feeds, which is appealing in simplicity, reducing losses during extrusion. Because the algae used in this study are natural products, their use would negate possible hesitation of the public to consume food fish grown on chemically produced algae and satisfy those who want to feed more “organic” feeds to their pets.