RedactedNarrative: Subjects were on board a small inflatable boat at night.  Operator reports he stood up, got his feet tangled in a fishing pole that was on the deck and fell over.  His wife, Occupant, also feel in but did not remember how.  Operator was transported to the hospital and treated for mild hypothermia.  A more then 1/2 empty bottle of tequila was located in the boat when it was found the next day but alcohol use could not be proven.