NinjasquirrelI do though (well, technically he's a flounder). I got one of these in black during the last drop. I love this pen and so does Fiddy.
p.s. I recommend the fine point as the medium writes pretty broad.
AmafanThe halibut doesn't have opposable thumbs for writing sadly, and the tank water would turn green upon the pen and ink entering... Maybe for the chimpanzee however, perfect gift!