Euryhalineadjective
Able to tolerate various saltwater concentrations.
Euryhaline
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.
Stenohalineadjective
(biology) Tolerant of only a narrow range of saltwater concentrations. Used of aquatic organisms
Stenohaline
Stenohaline describes an organism, usually fish, that cannot tolerate a wide fluctuation in the salinity of water. Stenohaline is derived from the words: meaning narrow, and meaning salt.