Fin's Fish Guide
The Jespersen's onejaw (Monognathus jesperseni) is a saltwater fish of the family Monognathidae that grows up to 11 cm.
Description
Jespersen's onejaw is an extremely rare, small deep-sea eel (Monognathidae) from the bathypelagic zone of the ocean. The species grows to about 11 cm and has a soft, eel-like, pale body notable for lacking the upper jaw; instead it has a venom tooth at the front of the mouth with which it injects prey. In the perpetually dark deep sea it seizes passing crustaceans and small fish. The fish is harmless to humans.
Frequently asked questions
How do you recognise the Jespersen's onejaw?
The Jespersen's onejaw has a snake-like body and is mainly white.
Where does the Jespersen's onejaw live?
The Jespersen's onejaw lives in the sea (marine waters) and is mostly found around open water. Africa: Sierra Leone
How big does the Jespersen's onejaw get?
The Jespersen's onejaw grows to a maximum of about 11 cm.
Is the Jespersen's onejaw dangerous to humans?
No, the Jespersen's onejaw is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Want the complete picture on the Jespersen's onejaw?
Point your camera at the fish and Fin names the species in seconds. Free, and the Jespersen's onejaw is one of 12,519 species in the app.