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Spookfish

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description Spookfish Overview

The spookfish, *Dolichopteryx longipes*, is a deep-sea fish notable for its unique tubular eyes. These specialized organs use reflective membranes instead of lenses to focus light, allowing the fish to see upwards through the dark depths. This adaptation is rare among vertebrates. It’s primarily studied by marine biologists researching deep-sea adaptations and visual systems.

help Spookfish FAQ

Does the brownsnout spookfish really use mirrors to see?

Yes, Dolichopteryx longipes has a downward-looking diverticulum in each eye that focuses light with a curved reflective structure. Its main upward-looking tubular eye still uses refractive optics, so saying the entire eye replaces lenses with mirrors is an oversimplification.

Why does the spookfish need both upward-looking and downward-looking vision?

The upward-facing portion can detect silhouettes or light coming from above, while the mirrored side structure gathers light from below. This gives the fish a wider view for finding prey or detecting threats in the dim deep sea.

How deep does Dolichopteryx longipes live?

The brownsnout spookfish is a deep-sea barreleye associated with dark mesopelagic and deeper water, and observations place it below roughly 1,000 metres. At that depth, sunlight is extremely weak and bioluminescence becomes an important visual signal.

Is Dolichopteryx longipes the same fish as the transparent-headed barreleye?

No, the famous transparent-headed barreleye is Macropinna microstoma. Dolichopteryx longipes belongs to the same family, Opisthoproctidae, but is distinguished by its long snout and mirror-bearing eye diverticula.

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