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Freshwater Crayfish 18(1): 69-74 (2011)


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Comparison of constructed microhabitat and baited traps in Table Rock Reservoir, Missouri, USA.

Parkyn SM, DiStefano RJ and Imhoff E  e-mail link

Published Online: 12/31/2011


Baited traps are the conventional method for sampling crayfish in lentic environments although this trapping method suffers several biases. We compared crayfish CPUE, size, and sex ratios in baited traps and microhabitat traps (constructed from cedar (Juniperus virginiana) branches) deployed in Table Rock Reservoir, Missouri, USA. Smaller size classes of Orconectes longidigitus (< 35 mm rostrum carapace length (RCL)) and the full size range of Orconectes ozarkae (4.8 – 29.2 mm RCL) were found in the cedar bundles and not encountered using conventional baited traps. Nightly trapping yielded 1:1 sex ratios in microhabitat traps, but when these traps were deployed for up to 12 nights the sex ratio favoured females (c. 70%). Baited traps were biased towards O. longidigitus (only two O. ozarkae were caught in baited traps), males (65%), and sizes > 35 mm RCL. Microhabitat traps were effective in both pebble/gravel and boulder/bedrock dominated sites and resulted in higher catch rates at 7 m depths rather than shallow 2 m depths (P < 0.01 in 12-night deployment for both species), but they were not adequate for sampling large O. longidigitus. These structurally complex microhabitat traps show promise as a representative sampling method when matched to species size, and for studies of juvenile recruitment.

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How to Cite

Parkyn SM, DiStefano RJ and Imhoff E. (2011). Comparison of constructed microhabitat and baited traps in Table Rock Reservoir, Missouri, USA. Freshwater Crayfish 18(1):69-74. doi: 10.5869/fc.2011.v18.69



Author Information

Stephanie  Parkyn,* 7 Hampden Rd, Freshwater Consultant, Battery Pt, Hobart, Tasmania, Australia7004. E-mail:

Robert J. DiStefano, Conservation, Missouri Department of Conservation, 1110 S. College Ave, Colombia, MO, USA65201. E-mail:

Emily  M. Imhoff, Conservation, Missouri Department of Conservation, 1110 S. College Ave, Columbia, MO, USA65201. E-mail:

Corresponding Author indicated by an *.


Publication History

   Manuscript Submitted: 12/10/2010

   Manuscript Accepted: 8/15/2011

   Published Online: 12/31/2011

   Published in Print: 12/31/2011



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No specific funding statement is available for this article.






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