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Osmoregulation in fishes. Osmosis The phenomenon of water flow through a semi-permeable membrane that blocks the transport of salts or other solutes through.

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Presentation on theme: "Osmoregulation in fishes. Osmosis The phenomenon of water flow through a semi-permeable membrane that blocks the transport of salts or other solutes through."— Presentation transcript:

1 Osmoregulation in fishes

2 Osmosis The phenomenon of water flow through a semi-permeable membrane that blocks the transport of salts or other solutes through it van't Hoff formula for osmotic pressure: p = cRT –c is the molar solute concentration –R is the gas constant –T is the absolute temperature

3 Osmoregulation Osmoconformer only Hagfish (Myxini) Osmoregulators Lampreys, elasmobranchs and teleosts Stenohaline Euryhaline

4 Accumulation of organic osmolytes (metabolic by-products): –Urea –TMAO (Trimethylamine n-oxide) Protein stabilization properties Achieve a slightly higher osmotic pressure than seawater FW sharks and rays do not accumulate urea/TMAO Elasmobranch osmoregulation in SW

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6 Osmotic gradients in teleosts High salinityLow salinity

7 FW SW

8 Teleost osmoregulation in SW

9 Chloride Cell Saltawater teleost Location: Gill & Operculum epithelia

10 Chloride Cell Saltawater teleost

11 Teleost osmoregulation in FW

12 “Chloride” Cell Freshwater teleost

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14 Fundulidae Mummichog Fundulus heteroclitus Keep cholride cells at all times, even when in freshwater

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16 Salmonidae Atlantic salmon Salmo salar Develop more chloride and accesory cells when migrate to SW (parr-smolt) Degenereration of chloride- accessory cell complexes when returning to FW (adults)


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