none none 1314-2488 1619-0033 NeoBiota NB Long-term changes in the prevalence of the crayfish plague pathogen and its genotyping in invasive crayfish species in Czechia Michaela Mojžišová Jitka Svobodová Eva Kozubíková-Balcarová Eva Štruncová Robin Stift Michal Bílý Antonín Kouba Adam Petrusek 74 105 2022 full_text 10.3897/neobiota.74.79087 2673-4133 Ecologies Ecologies Evaluating the Efficacy of Approaches to Control Invasive Populations: A Conceptual Model Development for the Signal Crayfish Sandra Hudina Ivana Maguire Paula Dragičević Nika Galic 3 2 78 2022 full_text 10.3390/ecologies3020008 2045-7758 2045-7758 Ecology and Evolution Ecology and Evolution Crayfish population size under different routes of pathogen transmission Mikko Koivu‐Jolma Raine Kortet Anssi Vainikka Veijo Kaitala 13 1 e9647 2023 full_text 10.1002/ece3.9647 20764324 20764332 Freshwater Crayfish Freshwater Crayfish Eroded Swimmeret Syndrome: Update of the Current Knowledge Jappo Jussila Vesa Tiitinen Jenny Makkonen Harri Kokko Patrik Bohman Lennart Edsman 26 1 63 2021 full_text 10.5869/fc.2021.v26-1.63 FRESHWATER CRAYFISH: Chronic crayfish plague infection and eroded swimmeret syndrome in Lake Saimaa (Finland) signal crayfish
Issue Cover image


Freshwater Crayfish 23(1): 23-28 (2017)


Download: PDF (587 KB)

Chronic crayfish plague infection and eroded swimmeret syndrome in Lake Saimaa (Finland) signal crayfish

Jussila J, Tiitinen V and Edsman L  e-mail link

Published Online: 12/31/2017


We present data and results from a 9-year survey (2009 – 2017) of the Lake Saimaa signal crayfish population in Finland. This population has a history of chronic infection with Aphanomyces astaci. It has now been discovered that female signal crayfish from Lake Saimaa suffer from various stages of eroded swimmeret syndrome (ESS), and male crayfish also show symptoms of ESS-like trauma (i.e., eroded swimmerets and gonopods). Our data demonstrates the prevalence of A. astaci infection, with gross symptoms prevailing throughout the duration of the entire 2009 – 2017 survey, and that prevalence of ESS among female signal crayfish is correlated with the prevalence of A. astaci infection in the population. The data shows that an increasing proportion of female crayfish suffer from ESS, and have regenerated swimmerets, however, our observations indicate that partially regenerated swimmerets do not fully function during egg hatching. Based on data and observations during the survey, we speculate that low production levels, as indicated by the low catch per unit effort (CPUE), within the Lake Saimaa signal crayfish population could be related to both high A. astaci infection levels and ESS prevalence among females. The former could be causing increasing mortality among adult crayfish and the latter could be lowering Lake Saimaa signal crayfish reproductive output.

Supplemental Documents

  • There are no supplementary documents for this article

CrossRef Logo

Cited By

0 Citations:

How to Cite

Jussila J, Tiitinen V and Edsman L. (2017). Chronic crayfish plague infection and eroded swimmeret syndrome in Lake Saimaa (Finland) signal crayfish. Freshwater Crayfish 23(1):23-28. doi: 10.5869/fc.2017.v23-1.23



Author Information

Japo  Jussila,* Dept of Environmental and Biological Sciences, University of Eastern Finland, P.O.Box 1627, Kuopio, Savo, Finland70100. E-mail:

Vesa  Tiitinen, Office, South Karelian Fisheries Advisory Center, Hietakallion katu 2, Lappeenranta, Etelä-Karjala, Suomi-Finland53850. E-mail:

Lennart  Edsman, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Stångholmsvägen 2, Drottningholm, Stockholm, Sweden17893. E-mail:

Corresponding Author indicated by an *.


Publication History

   Manuscript Submitted: 11/6/2017

   Manuscript Accepted: 12/17/2017

   Published Online: 12/31/2017

   Published in Print: 12/31/2017



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