Gar

The rare gar (ガー, Gā) acts as a nighttime counterpart to the giant snakehead. It sells for 6,000 Bells, the only fish that does, and is approximately two and a quarter meters long. It appears in late summer from 4:00 p.m. to 9:00 a.m.. It is also the most expensive river pool fish.

Donating to the museum
When placed in the museum, the gar shares a tank with the Arapaima, the middle tank in and the middle-right tank in. Until, Blathers makes a small speech about the donated gar.

In Wild World
", if you plan to raise a Gar at home, I have some crucial advice. You must be very careful not to overfeed it! These brutes grow much faster than you might suspect, eh wot? Before you know it, it could be bigger than you can handle! The horror!"

In City Folk
Blathers will say this when given the long fish:

"Hoo, I daresay you've really fished a winner this time, my dear owlet! Gar can grow to massive sizes--up to 120 inches! Let's hope this new addition to our museum can grow to equally enormous size..."

Further information
This fish can be caught up to about 4 meters (12 ft) in length. Its scales are diamond-shaped and are sometimes used for jewelery. It appears in North America, particularly the United States of America.