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    When a crayfish is not walking, how does water move over the gills?

    Question #94882. Asked by wwiivarn. (Apr 20 08 4:25 PM)


    triviapaul

    		This is one of the reasons crayfish almost exclusively live in (fast) flowing water: when the water moves they don't have to. Since their gills are located on their "legs", they just have to wave them around a lot to breathe, which they indeed do.

    The following paragraph is about insects, but it should be similar for arthropods.
    "However, water surrounding the insect can become oxygen-depleted if there is no water movement, so many aquatic insects in still water actively direct a flow of water over their bodies. They flap alot."

    http://en.wikipedia.org/wiki/Crayfish
    http://en.wikipedia.org/wiki/Decapod_anatomy
    http://en.wikipedia.org/wiki/Gill#Invertebrate_gills

    Apr 21 08, 6:07 AM

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