JellyBop

Anywhere on the map, but only while the “Aliens” admin event runs: that is the window for JellyBop, a Special fish. There is no real bait for it either; the entry shows an alien emoji and no bait at all.

Reeling it in is hard. The wiki gives the catch a -97% progress speed and describes erratic motion on the bar, and hooking one plays the shimmering sound shared by every Special fish. Its rarity rank is 14.

As for looks, it is an alien shaped like a cap, with large red eyes, several tentacles and blue serrated teeth underneath, like a parasite. The trivia adds that JellyBop is modeled on the Roblox catalog hat called “Dangerous Brain Infecting Parasite”, and in the game it is also worn as a hat.