Name the type of protective device against enemies, explain its purpose and relative character in the shallow

Name the type of protective device against enemies, explain its purpose and relative character in the shallow seahorse-rag fish, which lives at a shallow depth among aquatic plants.

1) Seahorse freezes among algae and becomes invisible to predators.
2) The similarity of the body shape and coloring of the animal with stationary natural objects is called masking.
3) But this similarity does not give them a full guarantee of survival, since when the fish move, or in the open space, the fish become noticeable to predators. This is the relative nature of fitness.