Rare footage of world’s largest deep sea fish that lives in complete darkness

Scientists have captured fascinating rare footage of the largest deep sea fish on the planet which lives in complete darkness over 6,000ft below sea level.

In a recently released clip from the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), the peculiar species of fish, known as the yokozuna slickhead, was filmed at depths below 6,562 feet.

The largest of the fish, which live beyond where sunlight can reach under the ocean, was reported to be around 8.2feet long in the video that was recorded in October 2021.

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The video shows around six slickheads swimming towards the light of the camera ⁠- seemingly fascinated by something they had never seen before.

It has since been shared on Instagram and YouTube, receiving comments from people who were surprised to see the size and strength of the creature living at perilous depths of the ocean.

One user commented: "I love fish, especially deep sea fish."

Another added: "This fish is strength."

A third wrote: "Big!! I'm always looking forward to it! The deep sea is mysterious."

According to experts, the species have evolved to live and catch enough food for their large size by developing specialised anatomy and behaviour for hunting in complete darkness in areas like Suruga Bay in Shizuoka Prefecture, Japan – which is over 8,000ft deep at its deepest point.

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However, the experts warned in their findings that they predict future disruption to the slickhead's habitat due to changes in the environment from global warming.

The research, published by Principal Researcher Yoshihiro Fujiwara, said: "The progression of global environmental changes affects the apex predators of every ecosystem, and changes across their populations are expected to disrupt local food chains, eventually causing catastrophic damage to entire ecosystems.

"The research team aims to understand the biodiversity present in offshore seabed nature conservation areas, including that of apex predators, based on the results of this study, which should promote technological development to allow for easier monitoring of deep-sea ecosystems."


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