Looks like they discovered it just in time to watch it being boiled to death. The ocean surrounding Florida has hit highs of 38℃ in recent days… not much marine life can survive that.
For what it’s worth, the manatee bay bouy [0] recorded the temperature at the sea surface level. Marine life will be just fine, as most (all?) marine life lives actually within the ocean rather than on the surface.
temperature itself isn't (directly) a threat to most macroorganisms, but marine life will not "be just fine". The real threat to them is the rapidly acidifying oceans