eels
The likely word is "eel" (a snakelike fish).The French word for island is spelled isle.
That fish is a "sole".
Minnow is a six letter word meaning small fish.
The word you are looking for is "serpentine," which means resembling a snake in shape or movement.
fish
roe
Fishes
fish
eel
The three-letter word for fish egg(s) is roe.
Fish starting with e
SHAD