During turtle farming operations in Torres Strait, green turtles (Chelonia mydas) penned on Murray Island became infected with a larval nematode (Anisakis sp. Type I). The larvae were found associated with haemorrhagic ulcers in the pyloroduodenal junction of the alimentary tract. The apparent source of infection was a locally abundant sardine (Harengula ovalis), on which the Murray Island turtles were fed. Turtles held on other islands in the region were not fed sardines and remained uninfected. Recommendations were made to prevent further infection.