A juvenile type of snailfish was filmed swimming at 27,349ft - nearly the same height as Mount Everest - in the Izu-Ogasawara Trench, south of Japan.
Lead scientist Professor Alan Jamieson said the snailfish could be at the maximum depth any fish can survive and probably did so because of trench's warm waters.
Although the snailfish was not caught to fully identify its species type, similar snailfish were captured higher up at a depth of 26,319ft which set the record for the deepest fish ever caught.
Professor Jamieson told BBC News: 'If this record is broken, it would only be by minute increments, potentially by just a few meters.'
He added: 'We predicted the deepest fish would be there and we predicted it would be a snailfish.
'I get frustrated when people tell me we know nothing about the deep sea. We do. Things are changing really fast.'
The previous deepest fish observation was made at 26,830ft further south in the Pacific in the Mariana Trench.

Prof Jamieson, who was born in Scotland, is credited with discovering not just the deepest fish in our oceans but also the deepest octopus, jellyfish and squid.




Reader Comments
I've caught fish at 1,200 feet off the bottom. The decompression from that depth even, causes quite dramatic barotrauma.