Swimming in Venice

I found this post on a Forum...and made me laugh...quite few times...But kids use to swim in Venice an no there were no sharks!

I keep seeing these movies and programs on TV about Venice Italy, and I see the people's houses that are like directly on the water, and can't help but think that it would be really cool to swim from place to place. Sure you would be dripping wet, but the water there looks really cool in the movies. (Although it's probably kinda nasty from all of the boats concentrated in that one area.) But I'm asking more of, would there be...sharks and stuff in Venice. If you look on Google Earth, the water eventually does reach the ocean. So I thought that maybe all sorts of evil animals and junk might be waiting to eat you as soon as you tried it. Anyway, those are my thoughts. I'd like to hear yours.