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RESPIRATION

RESPIRATION. STRUCTURES; arch, filaments, rakers WATER FLOW- in mouth & out operculum (gill cover) COUNTER CURRENT SYSTEM FOR EFFICIENT OXYGEN UPTAKE. COUNTER CURRENT SYSTEM. Blood flows counter (opposite) to the flow of water Result= more Oxygen transferred to the blood.

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RESPIRATION

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

  2. COUNTER CURRENT SYSTEM • Blood flows counter (opposite) • to the flow of water • Result= more Oxygen transferred to the blood

  3. 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).

  4. SWIM or GAS BLADDER • ;for NEUTRAL BOUYANCY • (neither floats or sinks) • Absent in bottom fish (Halibut) • and Pelagic fish (Tunas)

  5. 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?

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