USGS Frequently Asked Questions

Question: What does an Asian swamp eel look like?

Answer: Asian swamp eels may be confused with a number of native animals, including the native American eel, as well as several snake-like amphibians (e.g., sirens and amphiuma). The swamp eel has an elongate or snake-like body with no noticeable scales or fins. The head is relatively short and the teeth are small and not easily seen. The gill opening forms a V shape on the lower throat area. The body and head are dark, sometimes dark olive or brown above, but lighter, often light orange below.  Some individuals are brightly colored with yellow, black, and gold spots over a light tan or almost-white background.  The skin produces a thick mucous layer making the eels difficult to hold.