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| Cherax quadricarinatus | |
|---|---|
| Name | Redclaw crayfish |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Cherax |
| Species | quadricarinatus |
| Authority | (von Martens, 1868) |
Cherax quadricarinatus is a freshwater crayfish native to northern Australia and southern New Guinea, notable for its commercial importance and role as an invasive species. It has been the focus of research at institutions such as Commonwealth Scientific and Industrial Research Organisation and James Cook University, and appears in aquaculture operations linked to companies in Thailand and Vietnam. The species has influenced policy discussions in jurisdictions including Queensland and New South Wales.
Described by Eduard von Martens in 1868, the species belongs to the genus Cherax within the family Parastacidae, and its original description was published in 19th-century European taxonomic literature influenced by collections from expeditions to New Guinea and Australia. Subsequent revisions have been cited in monographs from institutions like the Natural History Museum, London and the Australian Museum, and molecular studies have referenced sequences in repositories such as the National Center for Biotechnology Information and analyses by researchers affiliated with the Smithsonian Institution. Synonymy and type locality discussions have appeared in works by authors associated with the University of Queensland and the Museum of Victoria.
Adults exhibit sexual dimorphism described in field guides used by the Queensland Department of Agriculture and Fisheries and illustrated in identification keys from the Australian Centre for International Agricultural Research. Typical coloration ranges from olive-brown to blue, with large chelae bearing four keels (hence the specific epithet discussed in classical descriptions circulated through the Linnean Society of New South Wales). Morphological characters used in systematics include rostral teeth counts and gonopod shape compared across specimens in collections at the South Australian Museum and the Western Australian Museum, while morphometric data feature in theses from Monash University and Griffith University.
Native distribution spans river systems in the Northern Territory, Queensland, and parts of Papua New Guinea, with occurrences documented in surveys funded by the Australian Research Council and regional environmental assessments by the Department of Environment and Heritage Protection (Queensland). Habitats include slow-flowing streams, billabongs, and reservoirs where vegetation communities monitored by the Wet Tropics Management Authority provide shelter. Introduced populations are recorded outside the native range in locales investigated by the Food and Agriculture Organization and environmental agencies in Israel, South Africa, and various Pacific islands.
Reproductive cycles and larval development have been investigated in laboratories at James Cook University and experimental farms partnered with CSIRO. Females brood eggs under the abdomen until hatching, and juveniles recruit to benthic microhabitats studied in ecological surveys coordinated by the Australian Institute of Marine Science. Diet studies citing stomach-content analyses reference comparative research from the University of Sydney and trophic investigations published in journals associated with the Ecological Society of Australia. Predation and competition interactions have been assessed alongside native fishes catalogued by the Museum and Art Gallery of the Northern Territory and invasive taxa compiled by the Invasive Species Council.
The species is farmed commercially in operations supported by extension programs from the Department of Agriculture and Water Resources and private firms in Thailand and Malaysia, with husbandry protocols developed through projects at the International Centre for Living Aquatic Resources Management. Production methods include pond culture and recirculating aquaculture systems trialed by researchers at Southern Cross University and the University of the Sunshine Coast. Market chains link producers to exporters dealing with trade regulations implemented by agencies such as the Australian Quarantine and Inspection Service and international standards promoted by the World Organisation for Animal Health.
Introductions, intentional or accidental, have prompted invasive-species responses coordinated by the Great Barrier Reef Marine Park Authority and regional biosecurity bodies including the Northern Territory Department of Primary Industry and Resources. Ecological impacts documented in case studies prepared for the United Nations Environment Programme and the Convention on Biological Diversity include alteration of benthic communities and competition with native crustaceans noted in surveys by the Australian Bureau of Agricultural and Resource Economics and Sciences. Management responses have involved legislative measures by state parliaments such as the Queensland Parliament and eradication trials supported by conservation NGOs like the World Wildlife Fund.
Conservation assessments reference listings maintained by the International Union for Conservation of Nature and national threatened-species processes administered through the Department of the Environment and Energy (Australia). Management strategies combine biosecurity protocols from the Department of Agriculture and Fisheries (Queensland) with outreach initiatives by the Invasive Species Council and research programs at Curtin University aimed at risk assessment. Cross-border coordination has been discussed in forums hosted by the Australian Academy of Science and regional workshops convened by the Secretariat of the Pacific Regional Environment Programme.
Category:Parastacidae Category:Freshwater crustaceans of Australia