Eel

The Eel is a very special fish in the games because it is the only fish with a long and thin shadow. It is a rather expensive fish, selling for 2,000 Bells at Tom Nook's store. The fish is another summer fish, of which there are many, and appears in the evening and night.

Donating to the Museum
The eel can be donated to the Museum by talking to Blathers. Below is what Blathers has to say during the donation in each game.

In Wild World
Blathers will talk about the eel when you donate it: "Grilled eel is supposedly quite succulent, but I have a bit of advice... Do NOT bring live eels to a cookout. Causes a bit of a scene, don't you know."

In City Folk
The eel appears in the right tank in the museum, when donated. It can be seen as a brown-coloured line moving across the bottom. Upon donation, Blathers's speech is as follows: "Eels are often thought of as river dwellers... but they actually go out to sea to lay their eggs, eh wot? If you can look past their slimy nature, you might notice they have round, expressive little eyes!"

Encyclopedia Information
Once the player has caught a particular fish or bug, they can find information about it in the bug or fish menus. Once the eel has been caught, the following information can be found in the fish menu:

Further Information
The American eel, Anguilla rostrata is a fish that spawns in salt water. After hatching, the baby eels make their way to North America, on the east coast. The eels, if hungry enough, may eat their own family to survive the trip to America. They prefer to hunt at night, which is referenced by the time it appears at in Animal Crossing.

Toy Set
The eel appeared in a toy set along with Purrl, a cat villager, a Koi and a fish tank.