Researchers conducting a census of sea slugs in the waters off south-east Queensland say climate change could be forcing the marine creatures south.
More than 80 citizen scientists have taken part in the second annual Gold Coast Sea Slug Census.
The aim is to find, identify and record the variety of brightly-coloured creatures in the region from South Stradbroke Island to Cook Island, just south of the border, in 48 hours.
Census organiser and Southern Cross University professor Stephen Smith said the short-lived gastropods were a good indicator of environmental changes.
"We're discovering that for well-known species we're seeing a substantial range extension," he said.
"It means they're moving south, probably under the influence of climate change."
More than 260 species of the elusive creatures are found in the region.
Local diver and underwater photographer Deb Aston is on a mission to catch them all.
"It's like a Pokemon addiction," she said.
"I'm thoroughly addicted, love the little critters.
"Everyone wants to see the one they haven't seen and collect a photo of it."
For Ms Aston, it is about more than just the science.
"It's exciting for me, my heart gets thumping," she said.
"You're trying to get the photo from the right angle and you've got a bit of surge happening and the animal turns its head away.
"So it's a bit of a challenge at times."
Professor Smith said without the help of the volunteers the census would be impossible.
"Deb and all the other divers involved in this program are essential for us to document this important environmental data," he said.
It is hoped the results will highlight the Gold Coast's marine biodiversity.
