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These were, at the time, the deepest living fish ever recorded on film. [3] The record was surpassed by a type of snailfish filmed at a depth of 8,145 m (26,700 ft) in December 2014, [ 4 ] and extended in May 2017 when another snailfish was filmed at a depth of 8,178 m (26,800 ft). [ 5 ]
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An unknown snailfish species of the genus Pseudoliparis was filmed in the Izu-Ogasawara Trench, south of Japan, at a depth of 8,336m during a two-month long expedition. ... The world's deepest ...
In December 2014, a new species of snailfish was discovered at a depth of 8,145 m (26,722 ft; 4,454 fathoms), breaking the previous record for the deepest living fish seen on video. [45] During the 2014 expedition, several new species were filmed, including huge amphipods known as supergiants.
Only one other species of fish has been recorded from depths in excess of 8,000 m (26,000 ft), the so-called ethereal snailfish (living in the same region as Pseudoliparis swirei but somewhat deeper), but it has only been seen on film and remain undescribed. [6]
There are over 300 species of Snailfish. While many live in shallow waters (tidepools) and river estuaries, some have adapted to the cold water, as well as the high-pressure depths of the world's deepest trenches over 7,000m. [8] In general, the snailfish (notably genus Pseudoliparis) is the most common and dominant family in the hadal zone. [4]
On this dive, Prof. Michibayashi became the deepest-diving Japanese person in history. [4] Also in August 2022, the deepest fish ever recorded on camera was filmed in the trench, a juvenile snailfish, at a depth of 8,336 meters. [5] The xenophyophore Occultammina was first discovered at a depth of 8260 metres in the trench. [6]
The record was surpassed by snailfish filmed in the Mariana Trench at depths of 8,145 m (26,722 ft) in 2014 [19] and 8,178 m (26,831 ft) in 2017, [14] [20] and at 8,336 m (27,349 ft) in the Izu–Ogasawara Trench in 2023. [21] The species in these deepest records are unknown and may be undescribed, but have been referred to as "ethereal snailfish".