The best replacement for eel is snake.

The best alternatives to eel are rated as following:
★★★★★  snake
★★★★  alligator
★★★  crocodile
★★  pfc
★★  octopus
★  sea snake
★  jellyfish
★  moray
  dervish
  piranha
  tire track eel
  gator
  banded sea snake

Your alternative for eel is not listed? Suggest!
Speaking about eel, one probably shouldn't forget about clown fish.

Other search terms related to eel and their ratings are:
★★★★★ clown fish
★ oscar
You have in mind a companion for eel and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of eel in all years. Click on graph for more.
eel
snake
alligator