Deep-Sea Barreleye Fish Filmed in Rare Encounter

Floating 1,970 feet below the surface of the Pacific Ocean, a Macropinna microstoma drifts through the dark with its internal organs and glowing green eyes encased within a fluid-filled, transparent dome. Monterey Bay Aquarium Research Institute scientists recently captured this elusive creature on camera for a rare, twenty-minute observation.

Editorial·October 31, 2026·reads: 504

Deep-Sea Barreleye Fish Filmed in Rare Encounter

The research team, operating the remotely controlled vehicle Doc Ricketts from the vessel David Packard, spotted the six-inch specimen about 55 miles off the coast of Monterey Canyon. While the species is known to inhabit the ocean's twilight and midnight zones, it remains notoriously difficult to study. In four decades of deep-sea exploration, the MBARI team has encountered the barreleye fish only ten times.

Senior scientist Steven Haddock described the animal as a creature that looks as if it were designed by an imaginative child. Historically, specimens brought to the surface in fishing nets lost their fragile, transparent head coverings, leading early researchers to misidentify the species based on damaged remains. Capturing the fish alive and intact in its natural habitat allows biologists to better understand the function of its upward-facing green eyes, which are protected by the fluid shield. This high-definition footage marks a significant milestone in documenting one of the ocean's most unusual biological structures.