“Electric Amazon” (2015) IMDb
Seen in 2018.
Seen with Swedish-language narration on SVT.
Biologist Will Crampton’s field work looking for electric fish. The electric eel, with its vital organs in its neck and its lungs in its mouth, is not the weirdest of them.
Some mention of voltage but nothing about current, which would be the dangerous bit. Excellent footage of marvelously weird knife fish, leaf fish etc., and room to imagine their Weltanschaung.