Freshwater goby

The freshwater goby (ドンコ, Donko) is a rare fish that can be caught in the river in every game. It has a small shadow, and it appears all year round. It can be caught between 4 pm and 9 am.

In Animal Crossing
"This is one of those fish that seem to mysteriously disappear from time to time. Drives fishermen batty, wot! Have no fear, dear friend! You're leaving this beauty in very good wings, hmmmm? Hoo! Owl humor. Hoo hoo!"

In Wild World
"A friend of mine claims that freshwater goby tastes fantastic on pizza. What a loon, eh wot?"

In City Folk
"This round little fish may look like a mild-mannered goby at first...but it's actually quite aggressive. The freshwater goby is known for its tendency to try to eat anything that will fit in its mouth... Rather shocking, really. I'm quite glad this little piggy's mouth is nowhere near owl-sized, eh wot?"

After donation, the freshwater goby can be found in the middle-left tank.

In New Leaf
After donating a freshwater goby to the museum, a sign will display a description about the fish.

"These short and stocky river-dwelling fish have a lot of slender teeth for tearing apart other fish. Freshwater gobies dig holes under rocks in riverbeds to make nests for eggs, which the males guard. Other fish breeds take advantage of this protective quality and often lay eggs in goby nests."

Encyclopedia Information
Upon catching a fish in and, information regarding it will appear in an encyclopedia. Below is the information on the freshwater goby:

Further Information
The freshwater goby is typically a native fish to tropical and temperate areas of Asia.