Starfish Salinity Requirements: Optimal Ranges and Tolerance

Starfish can tolerate a wide range of salinities due to their ability to osmoregulate, which means that they are able to maintain constant body fluids even when the salinity of the surrounding environment changes. Different species of starfish have different salinity tolerances but generally, most species can survive in salinities ranging from 15 to 40 parts per thousand (ppt).