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Fresh water/Salt water fish?

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Dencology

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guys i have a hard time understanding the concept of Fresh water fish and salt water fish. can anyone explain this to me? thanks.
 

tranv117

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what don't you understand? Are you talking about them being in a hyper vs hypoosmotic environment?
 

JBarr29

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yeah be a little more specific and ill try and help. What do you not understand?
 

Rubber Dam Man

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salt water fish are in constant threat of dessication as a result of their hyperosmotic environment - water flows out into the environment and therefore they must constantly drink water to compensate for this "imbalance." in addition, they produce a concentrated urine. on the other hand, fresh water fish are in a hypoosmotic environment and as a result water will naturally tend to flow into the cells of the internal environment. thus, they need to "drink" less water and produce a less concentrated urine. please feel free to correct me if I made a mistake somewhere in this brief description... everything is off the top of my head.
 

doc3232

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salt water fish are in constant threat of dessication as a result of their hyperosmotic environment - water flows out into the environment and therefore they must constantly drink water to compensate for this "imbalance." in addition, they produce a concentrated urine. on the other hand, fresh water fish are in a hypoosmotic environment and as a result water will naturally tend to flow into the cells of the internal environment. thus, they need to "drink" less water and produce a less concentrated urine. please feel free to correct me if I made a mistake somewhere in this brief description... everything is off the top of my head.

Well-said, but there is also salt transportation. Salt is released from the gills in salt-water fish and absorbed in fresh-water ones.
Rubberdamman summed it up well.
 
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