James Graham shared the sounder image depicting a crocodile’s silhouette on social media yesterday.

“It looked a lot like a croc to me,” Graham told 9News.

“It’s unusual to see that here in Noosa during winter, but when Kai, who was at the back of the boat, called out ‘Oi, come check this out’, you just look and think, ‘that’s definitely a croc’.

The typical southern border of crocodile habitat is Boyne River near Gladstone.

Sightings of crocodiles that far south are rare but not unprecedented.

“Kai and I have fished all of our lives and we’ve been in croc waters many, many times,” Graham said.

“You know what a crocodile looks like when it comes across your screen, and, and to me anyway, that’s it.”

Officials from the Department of Environment, Tourism, Science, and Innovation urged the public to report any sightings via the QWildlife app or directly through the department.