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Scientists discover ‘walking’ fish in depths of Barrier Reef

This is the first time international experts have been able to investigate life on the Great Barrier Reef at such great depths.

Mike Simpson by Mike Simpson
11-09-2020 03:00
in News
This Rhinopias agroliba is an exceedingly rare species and appears to “walk” along the seafloor using its pectoral fins. Photo credit: Schmidt Ocean Institute

This Rhinopias agroliba is an exceedingly rare species and appears to “walk” along the seafloor using its pectoral fins. Photo credit: Schmidt Ocean Institute

For the first time, scientists have viewed the deepest regions of the Great Barrier Reef Marine Park and discovered, among other things, an extremely rare fish that appears to “walk” along the seafloor.

Researchers say it propels itself along the seabed using its pectoral fins, and its motion in doing so is described as “an awkward, lumbering gait”.

Well-camouflaged ambush predator

Scientists aboard the RV Falkor, an oceanographic research vessel from the Schmidt Ocean Institute, say it is the first recorded observation in Australian waters of the fish, whose scientific name is Rhinopias agroliba. It is a colourful and well-camouflaged ambush predator in the scorpionfish family.

“It was very strange — it had this beautiful red colour and it walked on its pectoral fins like a set of hands,” Robin Beaman of James Cook University told ABC News.

He added that the closest known sighting of the fish was off the coast of Hawaii, so this was “a huge range extension”.

Discovered five undescribed species

According to a statement released by the US-based Schmidt Ocean Institute, it is the first time scientists have viewed the deepest regions of the Great Barrier Reef Marine Park.

In doing so, they discovered five undescribed species consisting of black corals and sponges, took the deepest samples ever collected of soft coral and scleractinian coral in the Coral Sea, and collected the first sample of ancient bedrock beneath the Great Barrier Reef, estimated to be between 40- and 50-million years old.

They also took critical habitat samples that will lead to a greater understanding of the spatial relationships between seabed features and the animals found in the Coral Sea. 

Robot explored floor at 1 800m

The research, described as complex and scientifically challenging, was completed aboard the vessel Falkor as part of the Institute’s Australia campaign.

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Using a remotely operated underwater robot to view high-resolution video of the bottom of the ocean floor, at some 1,820 meters deep, the science team examined deep sea bathymetry (the study of underwater depth of ocean floors), wildlife and ecosystems.

Answering a range of questions

The collaborative mission brought together scientists from Geoscience Australia, James Cook University, University of Sydney, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Queensland Museum Network, and Queensland University of Technology, to answer a range of questions about the geological evolution and biology of the deep sea canyons and reefs.

“Schmidt Ocean Institute and the technology that it has brought to Australia is a huge enabler in better understanding our marine resources from a lens of diverse disciplines,” said Dr Scott Nichol, one of the lead expedition scientists from Geoscience Australia.

“This work brings new understanding and will keep the scientists busy for years.”

Tags: Great Barrier Reef AustraliaResearchSchmidt Ocean Institutescience
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