Issue Cover image

You need to login to your IAA account in order to access jounral PDFs.
Member Login

Freshwater Crayfish 6(1): 94-99 (1986)


Download: PDF (943 KB)

The effect of river engineering works and disease on a population of Austropotamobius pallipes in the River Lea, UK

Lowery RS and Hogger JB  e-mail link

Published Online: 1/21/2020


For many years large numbers of A. pallipes have been taken from the River Lea but there has been no previous systematic collection of data concerning numbers present. During 1974-1978 the river was heavily dredged and a new weir and rock-lined stilling basin constructed. Invading crayfish numbers were monitored by trapping and mark and recapture. By 1981 numbers had risen from zero to an estimated 2.5 per m2; the population of juveniles could not be sampled. The population in the newly built works was stable with little evidence of migration back to the surrounding area. The broken rock construction was of obvious importance. In 1980 a tributary was being cleared of the aquatic grass, Glyceria maxima, using a 0.73 m dredge. This removed up to 137 crayfish at each operation stroke. Modification of the operation by rinsing the dredge returned a high proportion of animals to the water. In 1981 mortality of the study populations occurred, no other species was affected. Aphanomyces astaci was suspected but was not isolated until 1984, when it was found on experimentally caged crayfish. The mortality has spread upstream and the River Lea is now virtually devoid of crayfish. This was one of the first known occurrences of Aphanomyces astaci in the UK.

Supplemental Documents

  • There are no supplementary documents for this article

CrossRef Logo

Cited By


How to Cite

Lowery RS and Hogger JB. (1986). The effect of river engineering works and disease on a population of Austropotamobius pallipes in the River Lea, UK. Freshwater Crayfish 6(1):94-99. doi: 10.5869/fc.1986.v6.094



Author Information

Authorship information for this paper are currently unavailable.


Publication History

   Manuscript Submitted:

   Manuscript Accepted:

   Published Online: 1/21/2020

   Published in Print:



Funding Information

No specific funding statement is available for this article.






Member Login

Forgot Your Password?

Recover PW

Enter the e-mail address you used to
create your IAA account.
Return to Login
Back to Top