Police have arrested an alleged poacher after the discovery of the remains of protected animals at a north Queensland property.

Police and environmental protection officers searched a Townsville property late yesterday.

They found the remains of kangaroos, rays, fish, a green sea turtle and an estuary crocodile.

Shells, fireworks and ammunition was also located during a search at another property.

Acting Inspector John Mahony says a 24-year-old man has been arrested and two others have been linked to the dead croc.

"Investigations thus far have identified two other male people as responsible for the killing of the crocodile, the decapitation and skinning of that animal," Inspector Mahony said.

Police are investigating whether there is a link to the unlawful killing of a croc in a nearby river earlier this month.