osmoregulation in fish... salt loss and salt gain...

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Dominiquest
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osmoregulation in fish... salt loss and salt gain...

We were studying some time back about the osmoregulation in fish and there was this concept put forth by our lecturer stating that salts are lost through the skin of the fish or taken up by the skin of the fish.... i feel some how this is not true and when I put forth my views, he asked me to get relevant information that proves my point and I have been searching but I can't seem to find anything that explains it clearly.... Is it possible for anyone to help me on this? I need to know the exact mechanism of salt loss and salt gain by fish... Thank you...

mchinmoyee
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May I know what was your view

May I know what was your view? Before I explain what I have understood.
Thank you

Dominiquest
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I feel that the skin of the

I feel that the skin of the fish is semipermeable and so only water molecules can pass either in or out. He mentioned to us about the fish carrying out some wriggling motions to increase the force to expel the salts but whether you increase the pressure or not, only water molecules can pass through semipermeable membranes...

mchinmoyee
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Most fishes are

Most fishes are osmoregulators. Nature has well equipped them with various tool to overcome such kind problems. Well explained in the links below.

http://www.ca.uky.edu/wkrec/RedDrumPhysiology.htm

http://www.cartage.org.lb/en/themes/sciences/Zoology/AnimalPhysiology/Osmoregulation/Osmoregulation.htm