Actually Ive been on a cruise some yrs back that actually hit a big fish. I was on the aft. deck on the Holiday some yrs back heading out of Cabo San Lucas when I felt a shudder in the lower aft by the prop. A huge gush of blood spread like a pond in the wake as we continued on. I was shocked and quickly figured we must of hit either a bunch of dolphins or a whale that got in the prop. It was gross and bugged me for awhile, the crew just shrugged it off giving me an explination the whale must of been ill because they usually dont do that. Go Figure?