RESPIRATION

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RESPIRATION

• STRUCTURES arch, filaments, rakers
• WATER FLOW- in mouth out operculum (gill
  cover)
• COUNTER CURRENT SYSTEM FOR EFFICIENT OXYGEN UPTAKE

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COUNTER CURRENT SYSTEM

• Blood flows counter (opposite)
• to the flow of water
• Result more Oxygen transferred to the blood

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RESPIRATION/ GILLS (contd.)

• GILLS with special glands to excrete
• excess salt (salt water sp.)
• VARIATIONS
• LUNGFISH can gulp air into its gas bladder
• Gill rakers used to filter plankton
  (anchovy and herring).

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SWIM or GAS BLADDER

• for NEUTRAL BOUYANCY
• (neither floats or sinks)
• Absent in bottom fish (Halibut)
• and Pelagic fish (Tunas)

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• In a fish at 7000 meters depth, the pressure need
  in the bladder would be 5 tons per square inch,
  or 700 atmoshperes.
• What happens to a rockfish when caught and
  rapidly reeled to the surface?