A giant sunfish was pushed into deeper water. Then it came back.

The encounter in Tasmania’s River Derwent left a striking sighting but no confirmed rescue. In an ABC Hobart Drive interview published on November 5, 2026, marine biologist Neville Barrett gave the animal poor prospects, citing its apparent condition and freshwater-influenced water. No verified later account establishes whether it reached open water, received assistance or died.⁠1

Reed had been walking with his children, Rose and Sven, near the GASP walkway at Montrose Bay in Hobart’s northern suburbs. They initially thought they had spotted a seal. A woman nearby thought it was an injured shark; Reed briefly wondered whether it might be a young whale. The animal’s unfamiliar shape defeated those first guesses. Reed, who had never seen a sunfish before, sent a video to his friend Elliot Stiles, who identified it.⁠1

The fish was lying on its side. Reed estimated it was more than two metres long and just as high—an impression formed in the water, not a measured length. Its weight and exact species have not been established. Nor do the onlookers’ first guesses establish that it had suffered an injury.⁠1

Reed entered the water and pushed it outward until he was a little more than waist-deep. Then the footing became too rocky, with shells underfoot, and he was getting cold. Someone on shore told him a call had been made and assistance was coming, so he stopped. That assurance is the limit of the account: it does not establish that responders arrived or that an organised rescue followed.⁠1

On his return around 3 p.m., Reed found that the animal had moved all the way back into shallow water. He wondered whether it was confused or injured. Those were understandable suspicions, but neither was a diagnosis. What he could establish was that his effort to move it had not kept it out of the shallows.⁠1

For Barrett, a research associate at the Institute for Marine and Antarctic Studies, the exceptional part was not simply finding a sunfish in Tasmania. Sunfish inhabit tropical and temperate oceans, including waters as far south as the island. The surprise was finding one so far inside an estuary: these are oceanic animals, he explained, rarely seen even in coastal waters.⁠1

He suggested that the Derwent’s shape offered one possible explanation. The estuary narrows inward from Storm Bay, potentially funnelling an animal farther upstream and leaving it struggling to find its way out. That is a plausible route into difficulty, not a reconstruction of this individual’s journey. Nobody has tracked how this fish reached Montrose.⁠1

Unusual does not mean unprecedented. Redmap holds two separate verified Derwent-area sunfish records from December 2014: one reported by Richard Curtis on December 13 and another by Theo Muir Wilson at Lindisfarne on December 14. Those records do not establish whether the observers saw the same animal, and neither identifies the species of the Montrose fish. Barrett also described occasional encounters around Norfolk Bay and a recent sunfish washed up near Burnie.⁠70⁠71⁠1

Even in suitable water, moving such an animal is a formidable task. Barrett put an average sunfish broadly between 250 kilograms and one tonne, and said they can reach two and a half tonnes or more. None of those figures is a weight for Reed’s fish. They provide context for the cumbersome animal he was trying to push, rather than something he could simply pick up.⁠1

Barrett’s assessment was bleak: he thought the fish would probably die. Its return to the shallows suggested to him that it was already in poor condition. Its location added another concern: river runoff brings fresh water to the surface in this part of the Derwent, an environment a fully marine fish is not adapted to inhabit.⁠1

That reasoning matters, but so do its limits. There is no examination, measured salinity exposure or established cause of distress for this individual. The concern was harm from freshwater exposure—not evidence of a chemical spill or a confirmed poisoning diagnosis. An expert’s prediction of death cannot stand in for an observation that the animal died.⁠1

The sighting can still contribute to knowledge of these elusive fish. Redmap, associated with IMAS, invites community members to record species uncommon in their area, helping researchers log and map observations and track changes in distribution over time. It is a monitoring project, not an emergency rescue service, and one unusual visitor does not establish a climate-related cause.⁠77

For this sunfish, the last established scene remains the one Reed found on his return: an enormous marine animal back in shallow water despite his attempt to move it. Its prospects were poor. Its fate remains unknown.⁠1