A see through skull
a short video clip showing a deep sea barreleye fish
Footage of a barreleye fish (Macropinna microstoma) taken by MBARI scientists in the Monterey Submarine Canyon (Image credit: © 2021 MBARI)
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In December, MBARI researchers caught a rare glimpse of a barreleye fish (Macropinna microstoma). This bizarre fish has a translucent forehead, which it actually looks through using a pair of bulbous green eyes inside its head.
An ROV filmed the strange creature while cruising at a depth of about 2,132 feet (650 m) in the Monterey Submarine Canyon, one of the deepest submarine canyons on the Pacific coast. Extraordinarily, MBARI scientists have only ever spotted the species nine times previously, despite having completed more than 5,600 dives in the fish's habitat.
"The barreleye first appeared very small out in the blue distance, but I immediately knew what I was looking at. It couldn't be mistaken for anything else," Thomas Knowles, a senior aquarist at the Monterey Bay Aquarium, told Live Science.