Euryhaline - wikipedia 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. 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. 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 can not live in fresh water. Contents 1 Osmoregulation 2 Euryhaline fish 3 Other euryhaline organisms 4 See also 5 References Osmoregulation Osmoregulation Movement of water and ions in a saltwater fish ( yellow jack ) Movement of water and ions in a freshwater fish ( brown trout ) See also : Osmoregulation Osmoregulation is the active process by which an organism maintains its level of water content. The osmotic pressure in the body is homeostatically regulated in such a manner that it keeps the organism 's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. Two major types of osmoregulation are osmoconformers and osmoregulators. Osmoconformers match their body osmolarity to their environment actively or passively. Most marine invertebrates are osmoconformers, although their ionic composition may be different from that of seawater. Osmoregulators tightly regulate their body osmolarity, which always stays constant, and are more common in the animal kingdom. Osmoregulators actively control salt concentrations despite the salt concentrations in the environment. An example is freshwater fish. The gills actively uptake salt from the environment by the use of mitochondria - rich cells. Water will diffuse into the fish, so it excretes a very hypotonic ( dilute ) urine to expel all the excess water. A marine fish has an internal osmotic concentration lower than that of the surrounding seawater, so it tends to lose water ( to the more negative surroundings ) and gain salt. It actively excretes salt out from the gills. Most fish are stenohaline, which means they are restricted to either salt or fresh water and can not survive in water with a different salt concentration than they are adapted to. However, some fish show a tremendous ability to effectively osmoregulate across a broad range of salinities ; fish with this ability are known as euryhaline species, e.g., salmon. Salmon has been observed to inhabit two utterly disparate environments -- marine and fresh water -- and it is inherent to adapt to both by bringing in behavioral and physiological modifications. Some marine fish, like sharks, have adopted a different, efficient mechanism to conserve water, i.e., osmoregulation. They retain urea in their blood in relatively higher concentration. Urea is damaging to living tissue so, to cope with this problem, some fish retain trimethylamine oxide. This provides a better solution to urea 's toxicity. Sharks, having slightly higher solute concentration ( i.e., above 1000 mOsm which is sea solute concentration ), do not drink water like fresh water fish. Euryhaline fish Some euryhaline fish Short - finned molly Round goby Atlantic stingray Bat ray Longnose stingray Big - scale sand smelt Moonyfishes Pink salmon Barramundi Green sawfish Spanish toothcarp Atlantic threadfin Desert pupfish Mayan cichlid Crevalle jacks The level of salinity in intertidal zones can also be quite variable. Low salinities can be caused by rainwater or river inputs of freshwater. Estuarine species must be especially euryhaline, or able to tolerate a wide range of salinities. High salinities occur in locations with high evaporation rates, such as in salt marshes and high intertidal pools. Shading by plants, especially in the salt marsh, can slow evaporation and thus ameliorate salinity stress. In addition, salt marsh plants tolerate high salinities by several physiological mechanisms, including excreting salt through salt glands and preventing salt uptake into the roots. Despite having a regular freshwater presence, the Atlantic stingray is physiologically euryhaline and no population has evolved the specialized osmoregulatory mechanisms found in the river stingrays of the family Potamotrygonidae. This may be due to the relatively recent date of freshwater colonization ( under one million years ), and / or possibly incomplete genetic isolation of the freshwater populations, as they remain capable of surviving in salt water. Freshwater Atlantic stingrays have only 30 - 50 % the concentration of urea and other osmolytes in their blood compared to marine populations. However, the osmotic pressure between their internal fluids and external environment still causes water to diffuse into their bodies, and they must produce large quantities of dilute urine ( at 10 times the rate of marine individuals ) to compensate. Partial list Atlantic Stingray Bull Shark Green chromide Herring Lamprey Mummichog Molly Puffer fish Salmon Shad Striped bass Sturgeon Tilapia Trout Barramundi Mangrove Jack White Perch Killifish Desert pupfish Cobia Flathead mullet Bull shark Other euryhaline organisms other euryhaline organisms the seagrass Halodule uninervis Green sea urchin White - spotted jellyfish lagoon cockle New Zealand mud snail Amphipods of the Gammaridae family Irrawaddy dolphin ( compared with an average human ) Asian shore crab Shore crab Crab - eating Frog Diamondback terrapin See also Fish migration Osmoregulation Stenohaline Osmoconformer References Jump up ^ Thorson, T.B. ( 1983 ). `` Observations on the morphology, ecology and life history of the euryhaline stingray, Dasyatis guttata ( Bloch and Schneider ) 1801 ''. Acta Biologica Venezuelica. 11 ( 4 ) : 95&ndash, 126. Jump up ^ Piermarini, P.M. ; Evans, D.H. ( 1998 ). `` Osmoregulation of the Atlantic Stingray ( Dasyatis sabina ) from the Freshwater Lake Jesup of the St. Johns River, Florida ''. Physiological and Biochemical Zoology. 71 ( 5 ) : 553 -- 560. doi : 10.1086 / 515973. PMID 9754532. 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Portal WikiProject Salt and water balance in animals Hypertonicity Isotonicity Hypotonicity Osmoregulation Homeostasis Halotolerance ( Halophile ) Osmoconformer Euryhaline Stenohaline Salt gland Supraorbital gland Renal medulla Retrieved from `` https://en.wikipedia.org/w/index.php?title=Euryhaline&oldid=841203927 '' Categories : Aquatic ecology Talk Contents About Wikipedia Català Español فارسی Galego Bahasa Indonesia Italiano Polski Português Română Svenska Türkçe Українська 4 more Edit links This page was last edited on 14 May 2018, at 16 : 00 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what kind of fish live in salt water
Answer: euryhaline