When I was younger, I was swimming with my cousins in a lake in Kenora, ON. Just as I was about to jump off the dock, I saw a strange fish swimming from under it out towards the lake. It was swimming close to the surface and it was dark green and possibly had orange spots on it. It was flat with no tail and at the time I thought it was a bloodsucker.. it terrified me. To this day I want to know what I saw. Any ideas?