<P> Euryhaline organisms are able to adapt to a wide range of salinities . An example of a euryhaline fish is the molly (Poecilia sphenops) which can live in fresh water, brackish water, or salt water . The green crab (Carcinus maenas) is an example of a euryhaline invertebrate that can live in salt and brackish water . Euryhaline organisms are commonly found in habitats such as estuaries and tide pools where the salinity changes regularly . However, some organisms are euryhaline because their life cycle involves migration between freshwater and marine environments, as is the case with salmon and eels . </P> <P> The opposite of euryhaline organisms are stenohaline ones, which can only survive within a narrow range of salinities . Most freshwater organisms are stenohaline, and will die in seawater, and similarly most marine organisms are stenohaline, and cannot live in fresh water . </P>

Can some fish live in both saltwater and freshwater