Crayfish wikipedia - Search
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  1.  How They Mate and Multiply
    How They Mate and Multiply
    Crayfish are aquatic crustaceans that belong to the order Decapoda, which means "ten legs". They have a hard exoskeleton, a joined head and thorax, and a segmented body. They are closely related to lobsters, but differ in having their tails curled under their bodies.
    Terminology

    The name "crayfish" comes from the Old French word escrevisse (Modern French écrevisse). The word has been modified to "crayfish" by association with "fish" (folk etymology). The largely American variant "crawfish" i… See more

    Anatomy

    The body of a decapod crustacean, such as a crab, lobster, or prawn (shrimp), is made up of twenty body segments grouped into two main body parts, the cephalothorax and the abdomen. Each segment may possess one pair of … See more

    Diet

    Crayfish are opportunistic omnivorous scavengers, with the ability to filter and process mud. In aquaculture ponds using isotope analysis they were shown to build body tissue selectively from the animal protein port… See more

    Classification and geographical distribution

    Crayfish are closely related to lobsters, and together they belong to the infraorder Astacidea. Their phylogeny can be shown in the simplified cladogram below:
    Four extant (living) families of crayfish are described, t… See more

    Fossil record

    Fossil burrows very similar in construction to those of modern crayfish and likely produced by early crayfish are known from the Early Permian (~300-270 million years ago) of equatorial Pangea, in what is now North Amer… See more

    Threats to crayfish

    Crayfish are susceptible to infections such as crayfish plague and to environmental stressors including acidification. In Europe, they are particularly threatened by crayfish plague, which is caused by the North American … See more

    Invasive pest

    In several countries, particularly in Europe, native species of crayfish are under threat by imported species, particularly the signal crayfish (Pacifastacus leniusculus). Crayfish are also considered an invasive predatory s… See more

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