Australian red claw crayfish
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| Cherax quadricarinatus Von Martens, 1868 |
The Australian red claw crayfish, also called Queensland red claw or just redclaw, Cherax quadricarinatus, is an Australian freshwater crayfish. It is found in permanent freshwater streams, billabongs and lakes on the north coast of the Northern Territory and northeastern Queensland. Populations are also found in Papua New Guinea. Through translocation by humans, the range has spread down to southern Queensland and into the far north of West Australia. This tropical crustcean is very tolerant of environmental changes, and is primarily a detritivore.
Redclaw colour ranges from dark brown to blue-green body and adult males have a distinct red patch on the outer margin of the claws. They can reach up to 600 g. Redclaw are farmed commercially in Queensland and the Northern Territory, and are harvested at between 35 - 130 grams. Redclaw is a sought-after product with a delicate crustacean flavour. They are both non-aggressive in nature and highly fertile, and can therefore be bred in large numbers in captivity. Females, which are smaller than males, spawn approximately 300 olive green eggs which are fertilised from a spermatophore which the male has deposited at the base of her walking legs (periopods)during mating. Fertilised eggs are affixed to the females pleopods situated on the underside of the tale. Incubation takes approximately six weeks and the newely hatched juveniles rapidly become independent.The life cycle is simple and the animal reaches sexual maturity, and harvest size, somewhere between six to twelve months in optimal farmed conditions. Queensland Department of Primary Industries provides information to prospective farmers.
[edit] References
- Crandall (1996). Cherax quadricarinatus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Listed as Vulnerable (VU A1de v2.3)
