Based on the beautiful shark done by sharska1, I added the very important "laser" that can be attached to its head. The collar just snaps on to the shark, the "laser cannon" is sticked to the collar and can be removed or rotated freely.
As I wanted to print it really big (50 cm long shark) I had to split the shark in three parts due to z-axis limits of my printer. There are several bolts that give stability to the glued up parts. The two "laser gun" parts need to be glued as well.
I added supports for the two big fins but there is also a file of the top part of the shark without supports.