Florida Fish and Wildlife Conservation Commission officials say wildlife officers tracked and euthanized the alligator after the attack Tuesday afternoon in Everglades City.
Commission spokeswoman Carli Segelson tells the Naples Daily News the hand was pulled from the alligator's stomach and taken to the hospital where the captain was being treated.
No additional details about the attack were immediately available. It was unclear if anyone else was in the boat.
The commission identified the captain as 63-year-old Wallace Weatherholt of Captain Doug's Everglades Tours.