Big Fish is a background element/character in Abobo's Big Adventure.
Big Fish is a big robotic fish enemy that originates from Mega Man 2 in the third Wily castle stage from underwater pits.
In The Game
Big Fish's only role in the game is seen in the level "Super Mabobo." If Abobo falls underneath a underground pit in the level, the Big Fish will come up and eat and chop up Abobo and his body, which kills him. You can also get a Medal called "Fish Food" if you do this.