This is a Remora fish. It has a suction cup that can stick to almost anything. It sticks to fish like sharks to avoid predators and feeds off its host's poop. It's

7 Ocean Parasites Worth Celebrating on World Parasite Day

Absurd Creature of the Week: The Fish That Wears a Suction Cup as

RPG Writeups — Cerulean Seas

This Fish Has a Suction Cup on Its Head to Stick to Sharks

Did someone order a whale shark chauffeur? 🐋 Remoras 🐟 hang

What other purposes does the remora serve other than attach itself

Photos Greater Farallones National Marine Sanctuary

PDF) Saltwater aquarium reef tank book

What Good Is Half a Sucker?

Victoria and Tasmania Fishing Monthly - December 2014 by Fishing

Remora Fish, Suckers of the Sea, Inspire New Adhesives

What is the fish that sticks to sharks? - Quora