Abstract
This is a review covering chiefly the work of the author and collaborators on the processes of color pattern formation in various fishes with special reference to patterns known to be inherited as Mendelian unit characters. The following are considered Oryzias (Aplo-cheilus) latipes, Carassius auratus, Brachydanio rerio, Platypoecilus maculatus, Lebistes reticulatus, Betta splendens. An hypothesis of pattern formation in Oryzias is advanced.