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In addition to jellyfish, crustaceans and macroalgae were other important components of the diet of some species, while fish species such as the polar cod or snailfish played an important role for other species.

It looks like a character from an animated film but the EVNautilus deep-sea exploration project found this real snailfish deep in the Pacific Ocean.

The tadpole-shaped, translucent creature is a type of snailfish, and it’s probably the deepest fish anyone will ever find.

A team of Australian and Japanese researchers has set the record for the deepest fish ever filmed, after observing a type of snailfish swimming more than five miles underwater.

The species - a type of snailfish of the genus Pseudoliparis - was was filmed by an autonomous "lander" dropped into the Izu-Ogasawara Trench, south of Japan.