Crustacean - Crawfish / Crayfish - Sealife Centre postcard

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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Crayfish, also known as crawfish, crawdads, freshwater lobsters, mountain lobsters, mudbugs or yabbies, are freshwater crustaceans resembling small lobsters, to which they are related; taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills. Some species are found in brooks and streams where there is running fresh water, while others thrive in swamps, ditches, and rice paddies. Most crayfish cannot tolerate polluted water, although some species such as Procambarus clarkii are hardier. Crayfish feed on living and dead animals and plants.^[1]

The name "crayfish" comes from the Old French word escrevisse (Modern French écrevisse).^[2] The word has been modified to "crayfish" by association with "fish" (folk etymology).^[2] The largely American variant "crawfish" is similarly derived.^[2]

Some kinds of crayfish are known locally as lobsters,^[3] crawdads,^[4] mudbugs,^[4] and yabbies. In the Eastern United States, "crayfish" is more common in the north, while "crawdad" is heard more in central and southwestern regions, and "crawfish" further south, although there are considerable overlaps.^[5]

The study of crayfish is called astacology.^[6]

In Australia (on the eastern seaboard), New Zealand and South Africa, the term crayfish or cray generally refers to a saltwater spiny lobster, of the genus Jasus that is indigenous to much of southern Oceania,^[7] while the freshwater species are usually called yabby or kōura, from the indigenous Australian and Māori names for the animal respectively, or by other names specific to each species. Exceptions include western rock lobster (of the Palinuridae family) found on the west coast of Australia; the Tasmanian giant freshwater crayfish (from the Parastacidae family) found only in Tasmania; and the Murray crayfish found on Australia's Murray River.

In Singapore, the term crayfish typically refers to Thenus orientalis, a seawater crustacean from the slipper lobster family.^[8][9][10] True crayfish are not native to Singapore, but are commonly found as pets, or as an invasive species (Cherax quadricarinatus) in the many water catchment areas, and are alternatively known as freshwater lobsters.^[11][12]