Goldfish and koi are pretty bad about that, too. My dad has a decorative pond in his front yard, and I've had to climb in and work on a fountain that he used to have in the center of it. The fish would come up to me and start trying to suck all my leg hairs off! The bigger koi are also amusing in that if you stick you're finger near the water, they'll rise up and suck on it. I guess they'll at least try to eat just about anything...
