Crayfish, often referred to as crawfish, crawdad, or crodger, are freshwater crustaceans resembling small lobsters, to which they are closely related. They breathe through gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most crayfish cannot tolerate polluted water. Some crayfish have been found living as much as 3 m (10 feet) underground.

Names

The name “crayfish” comes from the Old French word escrevisse from Old Frankish *krebitja (cf. crab), from the same root as crawl. The word has been modified to “crayfish” by association with “fish” (Folk etymology). The largely American variant “crawfish” is similarly derived. Some kinds of crayfish are known locally as lobsters, crawdads, mudbugs and yabbies.

Anatomy

The body of a decapod crustacean, such as a crab, lobster, or prawn, is made up of nineteen body segments grouped into two main body parts, the cepalothorax and the abdomen. Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. A crayfish is usually 7.5 centimeters long.

Source: wikipedia.org

Indonesian Freshwater Crayfish

As a tropical country, Indonesia is a paradise for many kind of freshwater crayfish with various and exotic color; Cherax albertisi, Cherax lorentzii, Cherax monticola, Cherax sp. (Orange, Black Orange, Black Tiger, Super Red, Blue Moon, Zebra) are some species of freshwater crayfish native to the rivers of Eastern Indonesia especially in Sorong, Manokwari and Wamena regions. Although well-known to the locals of these isolated regions, it remained effectively unknown to the rest of Indonesia until the late of 1990s.

Australian Freshwater Crayfish

Australia have so many kind of freshwater crayfishes including the largest and smallest species in the world. Crayfish are heavy bodied crustaceans with an enlarged, pincer-like first pair of legs and are known by many common names depending on the area they are found. In New South Wales and Victoria they are called yabbies (Cherax destructor, Cherax albidus), in Western Australia the Koonac (Cherax preisii, Cherax glaber, Cherax plebejus), Gilgie or Jilgi (Cherax quinquecarinatus)  and the Marron (Cherax tenuimanus), while Queensland has the Redclaw (Cherax quadricarinatus).

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