Echinoderms in general are most vulnerable in their larval stage. As adults, asteroids have an anti-predator adaptation where they can lose an arm to a predator and the arm is later regenerated. Holothurians discharge sticky tubules, known as   Cuvierian tubules , at a potential predator. Otters prey mainly on sea urchins.

Known Predators:

• otters (Lutrinae)
• flounders (Pleuronectidae)
• haddock (Melanogrammus)