What is meant by euryhaline species?

Some fish species can live in both freshwater and saltwater. These species are called euryhaline fish. However, most fish species can only survive in one or the other based on their salinity tolerance, or how much salt their bodies can handle.

The highly adaptable euryhaline species are able to endure a wide range of salt levels , according to The National Biological Information Infrastructure (NBII). They are successfully able to migrate back and forth between saltwater, such as the ocean, and freshwater, which includes certain rivers.

There are two main types of euryhaline fish: anadromous and catadromous. Anadromous fish are born in freshwater but spend most of their lives in the sea, only returning to freshwater in order to spawn. These fish include salmon, smelt, shad, striped bass, and sturgeon, according to the Alaska Department of Fish and Game.

Much appreciated

http://www.livescience.com/32167-can-saltwater-fish-live-in-fresh-water.html

Thank you