Stick Ranger: Cavern Chronicles/Mud Grotto 2/White Castle Fish

About
Probably the most dangerous enemy in Mud Grotto 2, although that isn't saying much. The White Castle Fish attacks by shooting a white spike at you, which deals decent damage. It can also appear in groups of two or three in the later screens, and its swimming nature can pose problems. However, its swimming nature is also its greatest flaw, as it means it won't spawn at all in some cases. However, if you do encounter a group of them, be careful, as they can take down your team relatively quickly compared to the other enemies in the level. If you have a Sniper or a weapon that pierces the ground, you can easily just sit on the side of a water pool and snipe them from there; their projectiles cannot go through walls, which neutralizes the threat they pose further.