From Sonic Retro

BFish is a scrapped badnik found in prototype versions of Sonic the Hedgehog 2 (16-bit). Unlike Masher which simply moves up and down, BFish attacks Sonic in an arc-like motion. To destroy the badnik, simply roll or jump into it.

BFish is a placable debug object in Hidden Palace Zone (or "Spring Yard Zone", as it's called here) in the Sonic 2 Nick Arcade prototype (along with Gator and Stego). It can also be accessed in the Simon Wai prototype by hacking, though it was removed from the final game altogether.

Sonic the Hedgehog 2 (16-bit)

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