From Nookipedia, the Animal Crossing wiki
The Surgeonfish (ナンヨウハギ, Nan'yōhagi) is an uncommon fish found in the ocean all day between the months of April and September. It can be found in both Animal Crossing: City Folk and Animal Crossing: New Leaf. It is worth 1,000 Bells. It has a small shadow size, the same size as a Horse Mackerel. In the "Bugs and Fish" window in City Folk, it says "Usually found around reefs, these will hide if startled."
Donation to the Museum
In City Folk
"For future reference, I recommend you remember surgeonfish and coral as a set, wot wot? These bright fish have blue bodies and yellow tail fins, and they make their home in the southern seas. ...And what delightful, easygoing expressions they wear! I feel relaxed just looking at them!"
In New Leaf
"These tropical fish sport beautiful, yellow, triangular tails and elegant black lines on dazzling blue bodies. Personalitywise, the surgeonfish is actually rather laid back and timid. They seek out gaps in coral or between rocks for the greatest amount of protection while sleeping."
One the player has caught the Surgeonfish, the following information can be found in the encyclopedia:
The surgeonfish, surgeon for short, also known as the regal tang , palette surgeonfish, blue tang (not to be confused with the Atlantic Acanthurus coeruleus variety), royal blue tang, hippo tang, flagtail surgeonfish, pacific regal blue tang and blue surgeonfish, is a tropical fish that lives in areas such as Japan, East Africa, Samoa, New Caledonia, and even the Great Barrier Reef, Australia.
They change color when spawning, from a deep blue to a pale blue. The eggs hatch within 24 hours of fertilization, revealing small larvae with silvery abdomen. They are are inedible to humans, with a foul smelling flesh and taste, and are poisonous. They can, however, be used as a type of bait. It can easily protect itself using spines located near its tail, which extend when the fish is excited or threatened. It will slash sideways towards a predator and can cause deep wounds allowing venom to seep in, which can cause infections.
Names in other languages