In Florida, we had a huge one acre pond on the property. It had lots of sunfish and catfish, and some ornamental orange and golden carp, as well as, a fish called a blue shark. It was not related to the shark family, but I was told the fish could get quite large. I was swimming in the pond underwater one day and came face-to-face with this fish. We were eye-to-eye, that close and it scared me. I did not even know it was in there before that. I learned it is harmless to humans. I looked for it again but never found it. The ornamental carp were very friendly and would swim along with me and would eat from my hand.