Tuna

The Tuna is an fish that can be found in the ocean. It appears from November to March. It will appear all day. When selling it to Re-Tail, the player will earn 7,000 Bells.

Location
The Tuna is found in the ocean.

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

"Tuna can reach almost 10 feet in length and weigh over 800 pounds, which is huge in the fish world. Combining this great size with their good flavor makes them literally the biggest catch for most anglers. Tuna can't breathe when they aren't moving, so their entire lives revolve around constantly swimming. To sleep, they merely slow down. This ability to swim while sleeping is a huge advantage. They're also rather fast, capable of beating both sets of fins so hard they reach speeds of 50 mph."

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

"I caught a tuna! And now it's stuck in my head!"