Citizen scientists from around the world are being called on to analyse photos taken at parts of the Great Barrier Reef that have been studied before.

In October, a flotilla of tourist and dive boats, fishing vessels and superyachts hit the seas, to conduct a world-first census of the reef.

A conservation group recruited vessels to help survey up to 150 ecologically significant reefs, from the tip of Queensland down to Lady Elliot Island for 10 weeks.

They took 13,000 images in efforts to provide a big-picture snapshot of the health of the reef.

Up to 40 per cent of the natural wonder has never been surveyed before.

From tomorrow, citizen scientists from around the globe are being asked to study the images for a comprehensive understanding of its condition.

They can log into the Great Barrier Reef Census website to view the photos.

In 2019, Super Yacht Group Great Barrier Reef Chairman Kathleen Ferguson travelled to Europe's prestigious Monaco Yacht Show to entice some of the most luxurious boats to get involved.

Ms Ferguson knows of at least four 35metre vessels that took part.

"The benefit of having a super yacht is they can go out to further reef areas...to places undiscovered.

"To ensure the protection of the reef really needs to be based on real data.

"So if 40 per cent of the reef is unsurveyed that is a huge proportion of data that we just don't have."

The results of the census will be revealed at the end of the April, while this year's census will start again in October.

Ms Ferguson has already booked into the major boat shows in Australia, hoping to recruit more people with a love for the sea and a passion for protecting the reef to get involved.

[Photo: Reef Magic Cruises]