none none FRESHWATER CRAYFISH: Distribution and Biology of the Powerful Crayfish, <i>Euastacus valentulus</i> Riek 1951, in New South Wales, Australia
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Freshwater Crayfish 20(1): 17-26 (2014)


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Distribution and Biology of the Powerful Crayfish, Euastacus valentulus Riek 1951, in New South Wales, Australia

Coughran J  e-mail link

Published Online: 12/31/2014


The distribution and biology of the powerful crayfish, Euastacus valentulus Riek 1951, was examined through long-term monitoring at Iron Pot Creek and regional surveys at 245 sites in New South Wales, Australia. The species was recorded from 35 sites in the Clarence, Richmond, Tweed and Brunswick River catchments, in a wide range of habitats from 10 – 530 m above sea level. Limited recapture data indicated an absolute growth rate of ~0.7 mm per month. A maximum size of 110 mm OCL was recorded, with onset of female maturity at ~69 mm OCL. However, western animals were distinctly smaller, maturing at 40–45 mm OCL and attaining a maximum 65 mm OCL. The species was reproductively active in winter to spring; females at Iron Pot Creek carried fewer eggs (120–400) than eastern females (180–1,000+), and were collected over a longer period (June – November, cf. July – September). Eggs took approximately 7 weeks to hatch, with a further 4 weeks until juveniles became independent. GIS analysis of confirmed sites produced an Extent of Occurrence of 5436 km2. However, the biological differences recorded coincide with an obvious distribution gap, suggesting the possibility of cryptic speciation and/or fragmentation of the species across its range.

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How to Cite

Coughran J. (2014). Distribution and Biology of the Powerful Crayfish, Euastacus valentulus Riek 1951, in New South Wales, Australia. Freshwater Crayfish 20(1):17-26. doi: 10.5869/fc.2014.v20-1.17



Author Information

Jason  Coughran,* science, jagabar Environmental, PO Box 634, Duncraig, Western Australia, Australia6023. E-mail:

Corresponding Author indicated by an *.


Publication History

   Manuscript Submitted: 10/24/2014

   Manuscript Accepted: 12/23/2014

   Published Online: 12/31/2014

   Published in Print: 12/31/2014



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No specific funding statement is available for this article.






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