Robot filmed a rare giant Stygiomedusa gigantea.

Some scientists joke that the depths of the oceans are less studied than the far side of the moon. But in every joke there is some truth - according to some calculations, today humanity has really studied the depths of the oceans by a maximum of 5%. In 2011, the scientific journal PLOS Biology published the results of scientific work, stating that approximately 2.2 million animal species live in the oceans. Of these, science knows details only about 194,400 species. For 34 years, the Monterey Bay Aquarium Research Institute (MBARI) has been launching deep-sea robots that are equipped with powerful flashlights and cameras to shoot video. Recently, researchers have managed to capture a rare jellyfish of the species Stygiomedusa gigantea, which is huge in size. Since their discovery, scientists have been able to trace them only about a hundred times, so these creatures are very poorly studied. What interesting things did you find out during the recent meeting?

According to the scientific publication Science Alert, the Stygiomedusa gigantea jellyfish resembles a huge hat, from which long silk scarves stretch. The width of this "hat" is about 1 meter, and the four tentacles extend 10 meters in length. Since the jellyfish was found at a depth of 990 meters, it is impossible to see its true color in the video. According to the authors of the scientific work, the body of the jellyfish is colored reddish, but due to the lack of sunlight at great depths it seems that it is purple.

How do scientists study the depths of the ocean?
For the first time, scientists met this huge jellyfish back in 1899. It is generally accepted that these creatures are capable of dwelling in any waters except, perhaps, the cold territories of the Arctic. According to the Cambridge University Press, by 2009, only 110 cases of meeting with huge jellyfish were officially recorded. In addition, before the advent of deep-sea robots, these creatures were caught using fishing trawls - huge nets designed to catch fish in large waters. The disadvantage of this method is that jellyfish, which are 95-99% water, turn into shapeless jelly in the air and die.

The tentacles of the Stygiomedusa gigantea jellyfish reach 10 meters in length

Modern robots for deep water diving are commonly referred to as ROVs, which is an acronym for Remotely Operated Underwater Vehicle. Thanks to them, jellyfish and other creatures living at great depths can be observed in their natural habitat. In fact, the MBARI Research Institute has stumbled upon these creatures before - the described case is listed as the ninth.

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