Nematodes collected by gastric lavage from live American alligators, Alligator mississippiensis, in Florida.

Stomach nematodes were collected from 151 live American alligators, Alligator mississippiensis, from 3 lakes (Apopka, Griffin, and Woodruff) in north-central Florida using a gastric lavage technique. Four species were identified: Dujardinascaris waltoni, Ortleppascaris antipini, Brevimulticaecum tenuicolle, and larvae of Contracaecum sp. Of these, D. waltoni was the most prevalent species in all 3 lakes and was more prevalent in Lake Apopka than in the other 2 lakes. This is the first record of Contracaecum larvae in the American alligator and the second record of O. antipini.