MPAs protect entire , rather than just one animal.

Marine Protected areas are the ocean places that are set aside like parks, providing the sanctuary for the whole species rather than just one animal.

It also protects the whole food web so that by the time they can recover them self and thrive.

They are equipped to protect the rare species of fishes, corals and other type of endangered species of aquatic animals.  

They also consider kelp, migratory animals, birds thriving on water and inside water and ensures their life.

So, MPAs protect the entire system, food chain and aquatic animals associated with it rather than one animal.