A catfish with two beards that turns white has albinism. According to China Animal Network, the two bearded catfish turned white, which is caused by albinism. In normal catfish, part of the phenylalanine participates in the protein of the animal body, and the other part of the phenylalanine is converted into tyrosine. Tyrosine forms melanin under the action of tyrosinase. However, due to the lack of tyrosinase in the body of albino catfish, melanin cannot be synthesized, resulting in the phenomenon of albino catfish.