Image: Glasshead Barreleye from above

Glasshead Barreleye from above

The top of the head of a Glasshead Barreleye trawled from a depth of around 1000 m on the abyssal plain in the southern Tasman Sea, between Tasmania and New Zealand.  The two round structures are the primary eyes.  One  guanine crystal-lined mirror-organ is visible below the eye on the right.

Adrian Flynn
© Adrian Flynn


The barreleyes are an unusual family of deepsea fishes, most of which have upwardly-directed eyes. The eyes detect the silhouettes of prey swimming above.

In Australia, the Glasshead Barreleye has been collected from bathypelagic and mesopelagic depths off New South Wales.

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Tags fishes, ichthyology, Rhynchohyalus natalensis, Glasshead Barreleye, Opisthoproctidae,