Piranha

The Piranha is an fish that can be found in the river. It appears June to September from 9AM to 4PM and again at 9PM to 4AM. When selling it to Re-Tail, the player will earn 2,500 Bells.

Location
The Piranha is found in the river.

The Museum
The Piranha can be donated to the museum. Upon doing so, the following text is given by Blathers:

"They have terrifyingly sharp teeth, which contributes to their ferocious reputation. Oddly enough, they are actually quite timid, though they are still very dangerous fish. If they can't find food, they will resort to cannibalism or tear apart any animal they can grab hold of. Take care when catching them so they don't end up biting your hand with their sharp teeth!"

Quote
Upon catching the fish, the player will say the following:

"I caught a piranha! Or did it catch ME?!"