Foods that increase colors in animals include krill, shrimp, cayenne pepper, crabs for red colors and shad and smelt for blue colors. Mineral pigments can also change colors as can background/ substrates. Genetics r also important a albino fish only shows whites, yellows and where blood vessels occur red or pink, a platinum fish fed enough carotene a can turn yellow but an albino will not. Light can also influence colors with most fish showing best colors in unfiltered sunlight.
