The Asian sheepshead wrasse is a long-lived, funny-looking fish native to the Pacific Ocean near Korea, Japan, and China. Hiroyuki Arakawa is a diver who made friends with a wrasse named Yoriko over 25 years ago.
Arakawa dives to an underwater Shinto shrine at Japan's Tateyama Bay, and taps out a familiar call with a hammer. Yoriko then knows he has a visitor. Arakawa obviously enjoys seeing Yoriko, and you can assume that Yoriko is just as happy. -via the Presurfer