Difference between euryhaline and stenohaline in tabular form
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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 opposite of euryhaline organisms are stenohaline ones, which can only survive within a narrow range of salinities.
Aquatic environments are often subjected to physical and chemical change. The various salinity regimes that occur in estuaries are of particular importance to euryhaline species. Freshwater environments display a diversity of ionic types and ratios and typically have substantially lower levels of total dissolved solids (ions) than marine or brackish waters. In the marine environment, ions occur in compara¬tively stable ratios with absolute concentrations varying as a result of freshwater dilution or evaporation. Even though teleosts may live in waters which exhibit wide ranges of salinity, they are capable of maintaining relatively stable plasma and tissue dissolved ion con¬centrations (Holmes and Donaldson, 1969). The mechanism for maintaining constant internal ionic concentra¬tions relative to external or environmental ionic concentrations is known as osmoregulation. Fish at the extremes of their salinity tolerance range often exceed their ability to osmoregulate. This causes changes in plasma osmolarity leading to stress and, eventually, death. It is for this reason that an understanding of osmoregulation is important for those interested in the culture of marine and euryha¬line fishes and, to some extent, freshwater species.