Eels are fish

Here's a long-form article on the same topic (the 19th century search for the spawning ground of eels)

https://www.newyorker.com/magazine/2020/05/25/where-do-eels-... ("Where Do Eels Come From?" (2020))

https://news.ycombinator.com/item?id=23265000 (56 comments)