Looks like fun with a .22mag or .17hmr rifle. That said I haven't got a clue about shooting them from a boat in FL.
Here in WI you can shoot waterfowl from a boat but the boat has to be at rest... ie. not moving at all! If its moving its considered firing from a moving vessel/vehicle which is illegal except in cases of self defense.
In the case of a kayak where there is no anchor etc. I'd wonder if you could render the kayak immobile before shooting... or if that would take too much time before losing the shot opportunity.
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