Predators
There are only few known predators on Aplysia. Among possible predators are the sea anemone Anthopleura xanthogrammica, starfish, lobsters, and the ophistobranch Navanax intermis.
When it is considerably disturbed, as shown in the photograph at the top right, the sea hare is capable of releasing reddish-purple ink (much like an octopus does) from a gland in its mantle cavity as well as the aversive chemical opaline.
Read more about this topic: California Sea Hare