Regalecus glesne.

Regalecus glesne
The longest bony fish in existence and the largest fish in the order Lunaria (which has nothing to do with hairtail) can grow up to 8 meters and 272 kilograms, exceeding the Lunar Fish by a weak advantage of 2 kilograms, and even has a suspected satellite record of 11 meters. As one of the prototypes of the legendary sea snake, the royalty hairtail is a mysterious and peculiar creature with a flat silvery blue-striped body, two red pinnate crowns with fins on its head, and an elongated pelvic fin with paddle-like ends, which is also the source of its English name oarfish. Other popular names include the King of Herring.Earthquake fish (shared with close relatives such as coarse fin fish) because they often run aground before earthquakesLong Palace Envoy and White Dragon King.
Unlike legends and some stall literature, royalty is not a ferocious predator, nor does it have sharp teeth. Their teeth almost degenerate and disappear, but the special oral structure allows them to pop out their mouths more exaggeratively than ordinary bony fish and suck prey into their mouths. They swim vertically, relatively slow and inflexible, and migrate vertically to the sea at night. Yes, although the crown hairtail is a deep-sea fish with a distribution depth of up to 1000 meters, it usually stays at a depth of 20-200 meters, not too deep. Royal hairtail’s favorite prey is a variety of small crustaceans, but 1.8 meters of larvae have been found to prey on small fish. Many portraits of royalty include large decorative tail fins with 3-4 fins, which actually degenerate and disappear in adults, as adults do not have buttock fins.
The internal structure of the crowned hairtail is also very special. Its muscular septal system is very complex. In addition to the cross-shaped muscular septal of the common fish, there are three dorsal septal and three abdominal septal. In addition, the digestive system is disordered. Although the organs are confined to a relatively short segment of the body, the extended cecum extends all the way to the end of the body. (These two cross-sectional features are visible.) Many yellow Hairtails have neatly broken and healed traces that do not match those of predators. This actually comes from a skill that is not common in fish — self-cutting, combined with the organs mentioned above extending to the end of the body to see the ability to recover is even more terrible. It is speculated that when the crown hairtail is bitten by a predator, it will break its tail and escape. Some data even show that the crown hairtail over 1.5 meters has self-cutting phenomenon.This may explain why the ornamental tail fins of the royalty disappear, including adults and most larger larvae. The 8-metre-long crown hairtail was cut by itself before it was born, but that doesn’t mean it was ever longer than the captured size — it’s more likely to break off at an early age.。
Little is known about the life history of the crown hairtail. For a long time, information has come from scattered individuals washed ashore or caught. In recent years, more and more living records of the natural state of the Yellow hairtail have been recorded, and we have been able to further understand this still mysterious sea monster. Royal hairtail’s meat is very watery and has no edible value. Fishbase actually thinks it’s a fishing fish.It seems that the giant body and mysterious tracks of the croaker are still of some value in searching and fishing. At present, it is not threatened by human beings and its conservation level is LC.

Figure 1: nydailynews.com
Figure 2: gettyimages.com
Figure 3: theinertia.com
Figure 4: opeforum.com
Fig. 5: commons.wikimedia.org
Figure 6: cnn.com
Figure 7: ifunny.co
Figure 8: sciencepress. mnhn. fr
Figure IX: aquamap.org