I agree in the late 70's I worked in a pet department and the manager would order them sometimes. They were labeled as Marbled Eels. They were very difficult to handle and escaped easily.
One of my favorite fish magazines when there was no internet. Info on behavior and foods to feed them.
https://www.tfhdigital.com/tfh/nov_...cle.action?articleId=1448788#articleId1448788
I was also a huge fan of TFH back in the day (even more so of FAMA), but that very general article gives me pause. The author comments that swamp eels have spiny fin rays, whereas true anguillid eels do not. I'm not sure what he is talking about exactly; Anguillid eels at least have visible fins, with visible soft rays in them, whereas swamp eels seem much more worm-like or amphibian-like and really don't show anything like the typical structure we call "fins", just tiny flaps of skin running lengthwise along the body where one would expect dorsal, caudal and anal fins. No spines that I was ever able to see or feel. Really, the two groups don't even resemble each other that much. Anguillids look like long skinny fish; swamp eels don't look fish-like at all.
I think there might be some editing errors there?
Good call on the observation regarding current, by
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