The Big Fish is an enemy that appears in Rosenkreuzstilette.

Big Fish live in pits and will jump out to bite the player when she gets near. They cannot be harmed by the player by normal means, but can be defeated with the Freudenstachel. They are based on the enemy with the same name from Mega Man 2

In Rosenkreuzstilette, they appear in the Heiligtum des Wasserteufels (Trauare's stage) and the first stage of the Iris Palace.