Fish Identification?

[179]

I was coming back from B.I. last evening when I see a dorsal fin moving in the water, very slowly. I eased the boat up to it and it didn't run. It was a large fish I am guessing 200lbs, it was sought of a round shape, had no tail fin, one fin on the top, two under it's belly. It was dark gray with white spots, skin was hard (I actually touched it). The fish seemed to be just playing on the surface. Really cool!