The mysterious "ghost shark" was first discovered in the northern hemisphere.

The blue Cimara with a sharp nose was photographed by Tiburon, a remote-controlled car from Mbary, near the top of Davidson Seamount, which is about 1 mile (1.640m) deep from the central coast of California. Copyright 2007 MBARI) An elusive "ghost shark" came out of its hiding place, because the video captured the fish-its face looked like it was stitched up in Frankenstein's way-which was the first time in the northern hemisphere.

"This is a strange fish with a pointed nose. Ronnie Lundson, a senior research technician at the Monterey Bay Aquarium Research Institute (MBARI) in California, said that it has a long, pointed and thin tail, relatively large eyes, and it is almost completely gray-blue.

This rare deep-sea fish is called "ghost shark" because of its shape, and it is also known as the pointed-billed blue mouse fish. The animal first appeared in videos off the coast of Hawaii and California after researchers recorded it through a remote-controlled underwater vehicle (rov). Lundson told Life Science that there are six videos that provide the first evidence that this rodent lives in the northern hemisphere.

These videos were taken between 2000 and 2007, but it was not until June 5438+ 10 that the researchers published this discovery in the journal Marine Biodiversity Record. He and two colleagues wrote the study together.

The ROV of Monterey Bay Aquarium Research Institute captured six shots of ghost sharks of different individuals. Note that fish swim on rocks, not on soft sediments. (Reichert, A.N. et al. Enjoy the creativity of marine biodiversity records (20 16). The first three videos taken in 2000 were recorded before scientists confirmed the fish. It was not until 2002 that another group of scientists introduced this species into the scientific community and published it in Xibo magazine. In memory of Ray Troll, an Alaskan scientific illustrator who often paints marine animal discoveries, they named this fish Hydrolagus trolli. Although they named the newly discovered species, Dominic Didie, a biology professor and researcher at Millersville University in Pennsylvania, has never seen a living specimen. Instead, she and her colleagues studied the dead specimens of 23 giant lizards, which were caught as by-catch by trawlers (deep-sea fishing boats that caught marine animals with large nets) in the southwest Pacific Ocean. Runsten said that these fish were found in the southern hemisphere near Australia, New Zealand, New Caledonia, Lord Howells (deep sea plateau) and Norfolk Ridge.

But Didier did get a chance to watch MBARI's video and confirmed that the fish in the camera had winged fins, probably H.trolli, Runsten said.

We don't know much about H.trolli, because it lives deep underwater, ranging from 65,438+0 miles to 65,438+0.3 miles (65,438+0.640 to 2,063 meters), Runsten said. Fortunately, these videos helped researchers collect more clues about these ghost sharks, which are between 2 feet and 3 feet (0.6 to 0.9 meters) in length.

This is another picture of a blue shark with a pointed nose, taken near the top of Davidson Mountain. (Copyright 2007 MBARI) For example, the video shows H.trolli swimming across the rocky seabed instead of soft sediments. "This is unusual for rodents," Runsten said. [Rodents] are usually found on soft sediments, and the fact that they live in rocky habitats is unique to this group.

Lunderson added that the troll's Frankenstein-like thorns actually covered the fish's sensory organs, especially its face. These organs can sense tiny movements and vibrations in the surrounding waters, which helps fish to hunt, said Dave Ebert, who co-authored the study with Lundesten and Amber Reichett, a graduate student of marine science in California.