Gas Exchange in Fish

Details of the structure and function of the gas exchange sytem in fish 

  • Created by: cmulli16
  • Created on: 31-05-15 15:56

Gas Exchange in Fish

Structure of Gills

  • Gills are found behind the head of the fish and are composed of gill filaments
  • At right angles to the gill filaments are gill lamllae which increase the surface area for gas exchange
  • gill plates line the gill lamellae sides and are the surface area for gas exchange
  • Capilliaries carry deoxygenated blood to the gill plates and pumps it through the plates in the opposite direction to the flow of water
    • this countercurrent flow ensures the concentration of oxygen is always greatest in water and smallest in the gill plates
    • this constant concentration gradient allows for the maximum amount of oxygen to be absorbed from the water
    • no diffusion equilibrium is reached so the maximum volume of oxygen is absorbed
    • visa versa for carbon dioxide
  • Fish can't use their body surface for gas exchange as they are waterproof and have a small SA:V
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Structure of The Gills


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