Answer:

remora

Answer	Crossword Clue
REMORA	Suckerfish
REMORA	Fish with sucky habits
REMORA	Rider on a shark

REMORA	Shark hanger-on
REMORA	Saltwater sucker
REMORA	It parks on sharks
REMORA	Sharksucker
REMORA	Sucking fish
REMORA	Whalesucker
REMORA	Fish that attaches itself to whales, sharks, turtles, ships, etc.
REMORA	Fish often attached to a shark

REMORA	Egret : hippo :: ... : shark
REMORA	Shark clinger
REMORA	Shark hitchhiker
REMORA	Shark sucker
REMORA	Shark's hanger-on
REMORA	Shark-riding fish
REMORA	Marine hitchhiker
REMORA	Fish that hitches rides

REMORA	Fish that attaches itself to sharks.
REMORA	Fish that clings to a shark.
REMORA	Fish that gets a free ride on a shark or ship.
REMORA	Fish that clings to sharks.
REMORA	Fish with suction disk for clinging.
REMORA	Shark's hitchhiker.
REMORA	A fish, the shark sucker.
REMORA	Clingfish.

REMORA	Parasitic fish.
REMORA	Suckfish.
REMORA	Shark sucker.
REMORA	Sucking fish.
REMORA	Fish that travels with sharks.
REMORA	Hitchhiking fish
REMORA	Parasite fish
REMORA	Suckfish

REMORA	Ocean sucker
REMORA	Shark parasite
REMORA	Shark passenger
REMORA	Freeloading fish
REMORA	Shark's fellow traveler