Weird Fish With Transparent Head

The fish discovered alive in the deep water off California's Central Coast by the Monterey Bay Aquarium Research Institute (MBARI), it was the first specimen of its kind to be found with soft transparent dome intact.

It has 6-inch (15 centimeter barrel-eye (Macropinna microstomata). Then the eyes rotate forward to follow the prey, allowing the fish to home in on its meal.

They said that this fish is motionless, its eyes upward. The green lens atop each of the fish's eyes filters out what little sunlight makes it down from the surface, allowing the fish to focus on the bioluminescence of small jellies or other prey passing overhead.

The grayish, barrel-like eyes are beneath the green domes, which may filter light. In this picture the eyes are pointing upward--the better to see prey above in the darkness of the barreleye's deep-sea home.

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