These eels undergo a notable sequence of transformations before their journey back to the sea. It wasn't until the 19th century that science connected the trans

These eels undergo a notable sequence of transformations before their journey back to the sea. It wasn't until the 19th century that science connected the transitions from glass eel (larval form), to elvers, to yellow eel (freshwater adult), to silver eel (ocean spawning) form as members of the same species. Salmon are less mysterious as their spawning could be observed.