The American Eel: very demure, very mindful. So demure, in fact, that nobody has ever seen them spawn! These wonderfully mysterious fish start and end life in the Sargasso Sea with an incredible freshwater migration in between. We continue to unravel some of the mystery around this migratory fish with guest Ámbar Torres Molinari. This episode is dedicated to her late advisor Dr. Thomas J. Kwak and all the amazing field technicians who helped make her American Eel research possible in Puerto Rico.

If you're an ultra eel fan, you'll like Holly Richard's S1:E44 interview.

If you want to learn more about all the fish of Puerto Rico fishes, here are some episodes you'll enjoy:

• Mountain Mullet (S4:E26)
• Bigmouth Sleeper (S4:E8)
• Sicydium gobies (S3:E38)