fish; generic term for aquatic cold-blooded vertebrates with gills and fins

used in the names of various aquatic or water-dwelling animals that are not biologically fish, such as 鲍鱼 bào​yú (abalone), 鳄鱼 è​yú (crocodile), or 章鱼 zhāng​yú (octopus)

surname Yu

the 195th Kangxi radical (fish)