Black Hagfish Identification Guide
Recognize the Black Hagfish by its uniformly dark, purplish-black eel-like body and unusually high gill pore count.
Read the full Black Hagfish encyclopedia entry →Key identification features
- Uniformly dark grey to purplish-black, scaleless, eel-like body
- Blind head with only faint light-sensing skin patches, no true eyes
- A single nostril at the tip of the snout, encircled by short barbels
- Relatively high gill pore count, often 9-15 pairs along the throat, useful for species identification
- A single row of slime pores running the length of each flank
- One low, continuous fin fold along the tail rather than paired fins
Common look-alikes
- Other Pacific hagfish sharing its slope habitat are best separated by counting gill pore pairs and comparing typical depth range.
- Lampreys share a similar tube-shaped body but have visible eyes and a circular, tooth-lined sucker mouth that hagfish never develop.
- Deep-sea eels can look superficially similar from a distance but have jaws, paired fins, and scaled skin.
Where you'll see one
Black Hagfish live on the continental slope of the northeastern Pacific, from off California north to British Columbia, typically staying below about 500 meters on soft mud bottoms where they scavenge on dead or weakened animals.
Frequently asked questions
How do I confirm a Black Hagfish rather than another local Eptatretus species?
Count the gill pore pairs along the throat; the Black Hagfish tends to sit toward the higher end of the range compared with some regional relatives.
What separates a Black Hagfish from a deep-sea eel?
The hagfish has no jaws, no true eyes, and no paired fins, while an eel has all three plus visible scales embedded in the skin.