description Barreleye Fish Overview
The transparent dome over the head of Macropinna microstoma reveals the feature that gives this barreleye fish its name: a pair of tubular eyes. These eyes normally point upward, helping the fish detect prey against the faint light filtering down through the mesopelagic zone. They can also rotate forward, allowing it to follow food as it moves toward the mouth. The dome surrounds and protects this unusual visual apparatus.
Large, flat fins help the fish hold a stable position in the water, which complements its specialized way of watching for food. It belongs to the barreleye family, Opisthoproctidae, but the clear head makes this species especially distinctive. Marine biologists study it to understand vision and feeding in low light. MBARI's observations established the eye rotation, providing a clearer account of its behavior than preserved specimens alone could offer.
help Barreleye Fish FAQ
Where is Barreleye typically found in depth?
It is a deep-sea fish from midwater zones, often captured in mesopelagic habitats by deep sampling. Those depths are generally too hard to access for casual observation.
How are its eyes adapted to deep-sea hunting?
The fish can rotate its tubular eyes independently to track prey and contrast changes in dim light. This is one reason it is a standard example in visual adaptation teaching about pelagic predators.
Is the species likely to be seen in the aquarium trade?
It is rare and delicate to transport, so most encounters are scientific rather than consumer- aquaria-based. Most published material relies on field captures and deep-sea photography.
explore Explore More
Reviews & Comments
Write a Review
Be the first to review
Share your thoughts with the community and help others make better decisions.
