A really big needlefish is a houndfish.
They kill several people a year. Let me look up the data and get back.

Also, a jumping manta ray (400 pounds plus) can be a real killer, literally.
Let me look up the stats. I once had an airborne ray hit my center console of the boat in the keys. It ripped the grab rail and ferring right off the boat. Yikes....

In Jupiter if you sail out about a mile, the flying fish will have a tendency to fly around and sometimes into you. I bet Rick has seen this.

The worst critter, imo though, is the f'n oyster. They just sit there and wait for you to come to them. Bastards.