Wednesday, March 20, 2013


Life of Sea | Crayfish  | Crayfish are also called crawfish or crawdads are freshwater crustaceans resembling small lobsters, which they are associated, taxonomy, they are members of the superfamilies and Parastacoidea Astacoidea. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom. They are mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most lobster can not tolerate polluted water, although some species such as the invasive Procambarus clarkii more hardy. Crayfish feed on living and dead animals and plants.
In Australia, New Zealand and South Africa, the term crayfish or cray generally refers to a saltwater spiny lobster, Jasus species of the genus are native to much of southern Oceania, while the freshwater species are usually called Yabby or Koura, from Australia and the indigenous Māori name for each animal, or by any other name that is specific to each species. The exception is the freshwater crayfish Murray, who owned Parastacidae family and found in Australia Murray River.
The name "crayfish" comes from the Old French word escrevisse (Modern French ecrevisse) The word has been modified to "crayfish" by association with "fish" (folk etymology). Most American variant "crawfish" is similarly derived. Several types of lobster are known locally as lobsters, crawdads, mudbugs, and yabbies. 
In the Eastern United States, "crayfish" is more frequent in the north, while "crawdad" sounds more in the central and southwestern regions, and "crawfish" further south, although there is considerable overlap. The study of lobster called astacology

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