Eel meat is getting progressively more popular in the USA. So, I thought I'd let you all know something.
Freshwater eels, must lay their eggs in the ocean, in the wild (and they must also hatch and develop there). Even farmed eels come from young, wild-caught eels. They do not breed these eels in farms in captivity.
Eels are getting scarce. So, even if you're eating farmed eels, there's a strong possibility that you're contributing to their decline (currently).
The best way to eat eel sustainably seems to be to buy from farms that release 60+% of their eels back into the wild.
Migration barriers (from at least hydroelectric power) seem to be a huge aspect of their decline, however.
This article talks about the issue: https://triedandsupplied.com/saucydressings/sustainable-eel/
The article says this, "If you are looking to source eel sustainably, look out for the SEG and ESF logos."
Also see this similar article about farming octopi