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Crayfish usually have limited home range and so they rest, digest, and eliminate their waste, most commonly in the same location each day. Feeding exposes the crayfish to risk of predation, and so feeding behaviour is often rapid and synchronised with feeding processes that reduce such risks — eat, hide, process and eliminate.
Today adults commonly grow to 20–30 centimetres (8–12 in) in length. [2] In the past however they have been reliably recorded at significantly larger lengths and up to 2 kilograms (4.4 lb) in weight; the Murray crayfish is considered the second largest freshwater crayfish species in the world after the Tasmanian giant freshwater crayfish.
[2] [4] A 2004 study found the species appears to have periods of relative inactivity restricted to a "home-pool" for 1–10 days interspersed with movements involving travel over relatively large distances, including one crayfish moving over 700 m in a single night.
Procambarus clarkii, known variously as the red swamp crayfish, Louisiana crawfish or mudbug, [3] is a species of cambarid crayfish native to freshwater bodies of northern Mexico, and southern and southeastern United States, but also introduced elsewhere (both in North America and other continents), where it is often an invasive pest.
Measurement of a rusty crayfish. Adult rusty crayfish can reach 10 centimeters (4 inches) in length, although they reach maturity at about 4.4 cm (1.7 in), [11] and can range in color from greenish grey, to reddish brown, [12] [13] [14] They can be easily recognized by two "rusty", reddish colored spots on the sides of their back and their large front claws with black bands around the tips. [15]
A map of the “Crawdads” coastal setting, including the marsh, is available at the front of every “Crawdads” book and at the bottom of this page on author Owens’ website: deliaowens.com ...
The marbled crayfish or Marmorkrebs (Procambarus virginalis) is a parthenogenetic crayfish that was discovered in the pet trade in Germany in 1995. [4] [5] Marbled crayfish are closely related to the "slough crayfish", Procambarus fallax, [6] which is widely distributed across Florida. [7]
Lacunicambarus diogenes, the devil crayfish,devil crawfish, [1] [2] is a species of North American burrowing crayfish found in the Atlantic Coastal Plain and parts of the Piedmont ecoregion from New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, Louisiana, and Georgia.