Jellyfish

The Jellyfish is a unique fish. It has the shortest range of any fish (August 15th through August 30th), and it is the lowest selling fish, at 100 Bells. The jellyfish will appear all day during this short period of time.

Donating to the Museum
As with all fish and bugs in the, the jellyfish can be donated to the Museum by talking to Blathers. Below is what he says upon donation;

In Animal Crossing
"''Jellyfish and other gelatinous creatures are some of the ocean's most beautiful animal life. Some of them do pack a painful sting, but you'll be fine if you observe them from a respectful distance. Now then, let's get this one squared away in its new home, eh wot?"

In Wild World
"You can actually find these in restaurants, though which ones I do not know. Jellyfish can grow to be almost three feet long, did you know that?! That crunchy texture... It takes rather an open mind to enjoy, eh wot?"

In City Folk
"...Hoo, are you aware that the jellyfish is completely without bones? There's a legend that says the jellyfish had bones long ago, but they were taken away by a sea deity. ...Yes, the reason was that the jellyfish was quite the gossip and was eventually punished for it... Getting boneless... Rather a stiff punishment, eh wot?"

The jellyfish appears in the museum's right circular tank. It just hovers in the same place, occasionally jumping forward a bit.

Further information
Jellyfish are a very primitive species of Cnidarian; a group of early life forms that includes corals and jellyfish. Jellyfish are actually very closely related to coral. Cnidarians consist of two main "forms": polyps and medusa. The medusa strain is a single polyp that has adapted to float upside-down; these are jellyfish. When jellyfish are born they first stick to coral or other surfaces and as they grow they detach and assimilate into plankton where they grow into their adult stage.

The Moon Jellyfish is seen in Animal Crossing. This common and widespread group of jellyfish (genus Aurea) is quite distinctive due to the clover-leaf pattern on the top of its bell formed by gonads.

Trivia
In Animal Crossing: New Leaf, the player may encounter jellyfish underwater when diving. They will attack the player, in this respect, they are similar to bees.