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The tropical redclaw crayfish Cherax quadricarinatus is increasingly being reported as an aquatic pest in parts of the world where it has been introduced or translocated. In this paper, we briefly document the invasion of a stream system in New South Wales, Australia. We discuss possible pathways of introduction, and the potential threats the invading species presents to the receiving environment. We suggest immediate action is required to ascertain the invasive potential of this species.

Alderman, D.J. and Polglase, J.L. 1988. Pathogens, Parasites and Commensals. Pp. 167-212 in Freshwater Crayfish: Biology, Management and Exploitation, edited by D.M. Holdich and R.S. Lowery. Croom Helm Ltd., London.
Austin, C.M. 1986 Electrophoretic and morphological systematic studies of the genus Cherax (Decapoda: Parastacidae) in Australia. Ph.D. Thesis, Department of Zoology, University of Western Australia.
Austin, C.M. 1995. Evolution in the genus Cherax (Decapoda: Parastacidae) in Australia: a numerical cladistic analysis of allozyme and morphological data. Freshwater Crayfish 10: 419-426.
Austin, C.M. 1996. Systematics of the freshwater crayfish genus Cherax Erichson (Decapoda: Parastacidae) in northern and eastern Australia: electrophoretic and morphological variation. Australian Journal of Zoology 44; 259-296.
Capelli, G.M. and Munjal, B.L. 1982. Aggressive interactions and resource competition in relation to species displacement among crayfish of the genus Orconectes. Journal of Crustacean Biology 2(4): 486-492.
Coughran, J. 2002. A new species of the freshwater crayfish genus Euastacus (Decapoda: Parastacidae) from northeastern New South Wales, Australia. Records of the Australian Museum 54(1); 25-30.
Coughran, J. 2005a. Biology of the Freshwater Crayfishes of Northeastern New South Wales, Australia. Ph.D. Thesis, School of Environmental Science & Management, Southern Cross University.
Coughran, J. 2005b Cherax leckii n. sp. (Decapoda: Parastacidae): a new crayfish from coastal, northeastern New South Wales. Fishes of Sahul 19(4): 191-196.
Coughran, J. 2005c. New crayfishes (Decapoda: Parastacidae: Euastacus) from northeastern New South Wales, Australia. Records of the Australian Museum 57(3): 361-374.
Coughran, J. 2006 Field Guide to the Freshwater Crayfishes of Northeastern New South Wales. Natureview Publishing, Bangalow.
Doupé, R.G., Morgan, D.L., Gill, H.S. and Rowland, A.J. 2004. Introduction of redclaw crayfish Cherax quadricarinatus (von Martens) to Lake Kununurra, Ord River, Western Australia: prospects for a ‘yabby’ in the Kimberley. Journal of the Royal Society of Western Australia 87: 187-191.
Fisheries Global Information System. 2004 Searchable FAO database on Introductions of Aquatic Species. http://www.fao.org/WAICENT/FAOINFO/FISHERY/statist/fisoft/dias/index.htm (Accessed 19 October 2004).
Hollaway, M. and Hamlyn, A. 2001 Freshwater Fishing in Queensland: A Guide to Stocked Waters. (2nd Edition). Queensland Department of Primary Industries Publications, Brisbane.
Horwitz, P. 1990. The translocation of freshwater crayfish in Australia: potential impact, the need for control and global relevance. Biological Conservation 54; 291-305.
Horwitz, P. 1995 Preliminary Key to the Species of Decapoda (Crustacea, Malacostraca) Found in Australian Inland Waters. Identification Guide no. 5. Murray Darling Freshwater Research Centre, Cooperative Research Centre for Freshwater Ecology, Albury NSW.
Hyatt, M.W. n.d Investigation of Crayfish Control Technology. Final Report, Cooperative Agreement No. 1448-20181-02-J850. Arizona Game and Fish Department, Wildlife Management Division. Phoenix, Arizona.
Jones, C. 1990 The biology and aquaculture potential of the tropical freshwater crayfish Cherax quadricarinatus. Information series QI90028. Queensland Department of Primary Industries, Brisbane.
Kats, L.B. and Ferrer, R.P. 2003. Alien predators and amphibian declines: review of two decades of science and the transition to conservation. Diversity and Distributions 9: 99-110.
Lintermans, M. 2004. Human-assisted dispersal of alien freshwater fish in Australia. New Zealand Journal of Marine and Freshwater Research 38: 481-501.
Lodge, D.M., Taylor, C.A., Holdich, D.M. and Skurdal, J. 2000. Non-indigenous crayfishes threaten freshwater ecosystems and native crayfish biodiversity. Fisheries 25:7-20.
Lowery, R. 1996. Should Redclaw crayfish be introduced to Fiji? Pacific Conservation Biology 2: 312.
Ludwig, H.R. Jr. and Leitch, J.A. 1996. Interbasin transfer of aquatic biota via anglers' bait buckets. Fisheries 21: 14-18.
Merrick, J.R. 1995. Diversity, distribution and conservation of freshwater crayfishes in the eastern highlands of New South Wales. Proceedings of the Linnean Society of N.S.W. 115: 247-258.
Moore, A. 2003. Emigrant Creek Dam Biological Survey. Report for Rous Water, Lismore, NSW.
Morgan, G.J. 1997. Freshwater crayfish of the genus Euastacus Clark (Decapoda: Parastacidae) from New South Wales, with a key to all species of the genus. Records of the Australian Museum (1997) Supplement 23.
New South Wales Department of Primary Industries - Fisheries. 2005 Fish in Farm Dams. Information Sheet. http://www.fisheries.nsw.gov.au/aquaculture/general/fish_in_farm_dams Accessed 13 June 2005.
Olszewski, P. 1980 A Salute to the Humble Yabby. Angus and Robertson, Sydney.
Riek, E.F. 1969. The Australian freshwater crayfish (Crustacea: Decapoda: Parastacidae) with descriptions of new species. Australian Journal of Zoology 17: 855-918.
Short, J. W. 2000 Freshwater Crayfish. Information leaflet, Queensland Museum, Brisbane.
Smith, G.W. and Schuster, E.H.J. 1913. The genus Engaeus, or the land crayfishes of Australia. Proceedings of the Zoological Society of London: 112-27.
Todd, S-R, D'Andrea, M. 2003. Alien Crayfish Invasion of Jamaican Rivers. Crayfish News 25 (4): 17-18.
Unestam, T. 1975. The dangers of introducing new crayfish species. Freshwater Crayfish 2: 557-561.
Westman, K. 1995. Introduction of alien crayfish in the development of crayfish fisheries; experience with Signal Crayfish ( Pacifastacus leniusculus (Dana)) in Finland and the impact on the Noble Crayfish ( Astacus astacus (L.)). Freshwater Crayfish 10: 1-17.
Wingfield, M. 2002. An overview of the Australian freshwater crayfish farming industry. Freshwater Crayfish 13: 177-184.
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References

Alderman, D.J. and Polglase, J.L. 1988. Pathogens, Parasites and Commensals. Pp. 167-212 in Freshwater Crayfish: Biology, Management and Exploitation, edited by D.M. Holdich and R.S. Lowery. Croom Helm Ltd., London.
Austin, C.M. 1986 Electrophoretic and morphological systematic studies of the genus Cherax (Decapoda: Parastacidae) in Australia. Ph.D. Thesis, Department of Zoology, University of Western Australia.
Austin, C.M. 1995. Evolution in the genus Cherax (Decapoda: Parastacidae) in Australia: a numerical cladistic analysis of allozyme and morphological data. Freshwater Crayfish 10: 419-426.
Austin, C.M. 1996. Systematics of the freshwater crayfish genus Cherax Erichson (Decapoda: Parastacidae) in northern and eastern Australia: electrophoretic and morphological variation. Australian Journal of Zoology 44; 259-296.
Capelli, G.M. and Munjal, B.L. 1982. Aggressive interactions and resource competition in relation to species displacement among crayfish of the genus Orconectes. Journal of Crustacean Biology 2(4): 486-492.
Coughran, J. 2002. A new species of the freshwater crayfish genus Euastacus (Decapoda: Parastacidae) from northeastern New South Wales, Australia. Records of the Australian Museum 54(1); 25-30.
Coughran, J. 2005a. Biology of the Freshwater Crayfishes of Northeastern New South Wales, Australia. Ph.D. Thesis, School of Environmental Science & Management, Southern Cross University.
Coughran, J. 2005b Cherax leckii n. sp. (Decapoda: Parastacidae): a new crayfish from coastal, northeastern New South Wales. Fishes of Sahul 19(4): 191-196.
Coughran, J. 2005c. New crayfishes (Decapoda: Parastacidae: Euastacus) from northeastern New South Wales, Australia. Records of the Australian Museum 57(3): 361-374.
Coughran, J. 2006 Field Guide to the Freshwater Crayfishes of Northeastern New South Wales. Natureview Publishing, Bangalow.
Doupé, R.G., Morgan, D.L., Gill, H.S. and Rowland, A.J. 2004. Introduction of redclaw crayfish Cherax quadricarinatus (von Martens) to Lake Kununurra, Ord River, Western Australia: prospects for a ‘yabby’ in the Kimberley. Journal of the Royal Society of Western Australia 87: 187-191.
Fisheries Global Information System. 2004 Searchable FAO database on Introductions of Aquatic Species. http://www.fao.org/WAICENT/FAOINFO/FISHERY/statist/fisoft/dias/index.htm (Accessed 19 October 2004).
Hollaway, M. and Hamlyn, A. 2001 Freshwater Fishing in Queensland: A Guide to Stocked Waters. (2nd Edition). Queensland Department of Primary Industries Publications, Brisbane.
Horwitz, P. 1990. The translocation of freshwater crayfish in Australia: potential impact, the need for control and global relevance. Biological Conservation 54; 291-305.
Horwitz, P. 1995 Preliminary Key to the Species of Decapoda (Crustacea, Malacostraca) Found in Australian Inland Waters. Identification Guide no. 5. Murray Darling Freshwater Research Centre, Cooperative Research Centre for Freshwater Ecology, Albury NSW.
Hyatt, M.W. n.d Investigation of Crayfish Control Technology. Final Report, Cooperative Agreement No. 1448-20181-02-J850. Arizona Game and Fish Department, Wildlife Management Division. Phoenix, Arizona.
Jones, C. 1990 The biology and aquaculture potential of the tropical freshwater crayfish Cherax quadricarinatus. Information series QI90028. Queensland Department of Primary Industries, Brisbane.
Kats, L.B. and Ferrer, R.P. 2003. Alien predators and amphibian declines: review of two decades of science and the transition to conservation. Diversity and Distributions 9: 99-110.
Lintermans, M. 2004. Human-assisted dispersal of alien freshwater fish in Australia. New Zealand Journal of Marine and Freshwater Research 38: 481-501.
Lodge, D.M., Taylor, C.A., Holdich, D.M. and Skurdal, J. 2000. Non-indigenous crayfishes threaten freshwater ecosystems and native crayfish biodiversity. Fisheries 25:7-20.
Lowery, R. 1996. Should Redclaw crayfish be introduced to Fiji? Pacific Conservation Biology 2: 312.
Ludwig, H.R. Jr. and Leitch, J.A. 1996. Interbasin transfer of aquatic biota via anglers' bait buckets. Fisheries 21: 14-18.
Merrick, J.R. 1995. Diversity, distribution and conservation of freshwater crayfishes in the eastern highlands of New South Wales. Proceedings of the Linnean Society of N.S.W. 115: 247-258.
Moore, A. 2003. Emigrant Creek Dam Biological Survey. Report for Rous Water, Lismore, NSW.
Morgan, G.J. 1997. Freshwater crayfish of the genus Euastacus Clark (Decapoda: Parastacidae) from New South Wales, with a key to all species of the genus. Records of the Australian Museum (1997) Supplement 23.
New South Wales Department of Primary Industries - Fisheries. 2005 Fish in Farm Dams. Information Sheet. http://www.fisheries.nsw.gov.au/aquaculture/general/fish_in_farm_dams Accessed 13 June 2005.
Olszewski, P. 1980 A Salute to the Humble Yabby. Angus and Robertson, Sydney.
Riek, E.F. 1969. The Australian freshwater crayfish (Crustacea: Decapoda: Parastacidae) with descriptions of new species. Australian Journal of Zoology 17: 855-918.
Short, J. W. 2000 Freshwater Crayfish. Information leaflet, Queensland Museum, Brisbane.
Smith, G.W. and Schuster, E.H.J. 1913. The genus Engaeus, or the land crayfishes of Australia. Proceedings of the Zoological Society of London: 112-27.
Todd, S-R, D'Andrea, M. 2003. Alien Crayfish Invasion of Jamaican Rivers. Crayfish News 25 (4): 17-18.
Unestam, T. 1975. The dangers of introducing new crayfish species. Freshwater Crayfish 2: 557-561.
Westman, K. 1995. Introduction of alien crayfish in the development of crayfish fisheries; experience with Signal Crayfish ( Pacifastacus leniusculus (Dana)) in Finland and the impact on the Noble Crayfish ( Astacus astacus (L.)). Freshwater Crayfish 10: 1-17.
Wingfield, M. 2002. An overview of the Australian freshwater crayfish farming industry. Freshwater Crayfish 13: 177-184.
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