none none 0706-652X 1205-7533 Canadian Journal of Fisheries and Aquatic Sciences Can. J. Fish. Aquat. Sci. Predicting harvest of non-native signal crayfish in lakes — a role for changing climate? Patrik Bohman Lennart Edsman Alfred Sandström Per Nyström Marika Stenberg Pia Hertonsson Jacob Johansson 73 5 785 2016 full_text 10.1139/cjfas-2015-0241 20764324 20764332 Freshwater Crayfish Freshwater Crayfish Is Aphanomyces astaci Losing its Stamina: A Latent Crayfish Plague Disease Agent From Lake Venesjärvi, Finland Japo Jussila Caterina Francesconi Kathrin Theissinger Harri Kokko Jenny Makkonen 26 2 139 2021 full_text 10.5869/fc.2021.v26-2.139 20764324 20764332 Freshwater Crayfish Freshwater Crayfish Chronic crayfish plague infection and eroded swimmeret syndrome in Lake Saimaa (Finland) signal crayfish Japo Jussila Vese Tiitinen Lennart Edsman 23 1 23 2017 full_text 10.5869/fc.2017.v23-1.23 1932-6203 PLOS ONE PLoS ONE Mapping 15 years of crayfish plague in the Iberian Peninsula: The impact of two invasive species on the endangered native crayfish Laura Martín-Torrijos Harri Kokko Jenny Makkonen Japo Jussila Javier Diéguez-Uribeondo Irene Söderhäll 14 8 e0219223 2019 full_text 10.1371/journal.pone.0219223 20764324 20764332 Freshwater Crayfish Freshwater Crayfish Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint Japo Jussila Lennart Edsman 25 1 39 2020 full_text 10.5869/fc.2020.v25-1.039 2296-701X Frontiers in Ecology and Evolution Front. Ecol. Evol. Money Kills Native Ecosystems: European Crayfish as an Example Japo Jussila Lennart Edsman Ivana Maguire Javier Diéguez-Uribeondo Kathrin Theissinger 9 648495 2021 full_text 10.3389/fevo.2021.648495 1461-023X 1461-0248 Ecology Letters Ecol Lett Boom‐bust dynamics in biological invasions: towards an improved application of the concept David L. Strayer Carla M. D'Antonio Franz Essl Mike S. Fowler Juergen Geist Sabine Hilt Ivan Jarić Klaus Jöhnk Clive G. Jones Xavier Lambin Alexander W. Latzka Jan Pergl Petr Pyšek Peter Robertson Menja Schmalensee Robert A. Stefansson Justin Wright Jonathan M. Jeschke Regan Early 20 10 1337 2017 full_text 10.1111/ele.12822 0018-8158 1573-5117 Hydrobiologia Hydrobiologia First detection of the crayfish plague pathogen Aphanomyces astaci in South America: a high potential risk to native crayfish Douglas Fernando Peiró Mauricio P. Almerão Carine Delaunay Japo Jussila Jenny Makkonen Didier Bouchon Paula B. Araujo Catherine Souty-Grosset 781 1 181 2016 full_text 10.1007/s10750-016-2841-4 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.v26-1.63 978-1-4665-8639-0 978-1-4665-8640-6 Freshwater Crayfish Chaos and Adaptation in the Pathogen-Host Relationship in Relation to the Conservation: The Case of the Crayfish Plague and the Noble Crayfish Japo Jussila Ivana Maguire Harri Kokko Jenny Makkonen 246 2015 full_text 10.1201/b18723-15 2161-9549 2161-9565 Freshwater Science Freshwater Science Invasive rusty crayfish (Faxonius rusticus) populations in North America are infected with the crayfish plague disease agent (Aphanomyces astaci) Jörn Panteleit Thomas Horvath Japo Jussila Jenny Makkonen William Perry Ralf Schulz Kathrin Theissinger Anne Schrimpf 38 2 425 2019 full_text 10.1086/703417 1961-9502 Knowledge and Management of Aquatic Ecosystems Knowl. Manag. Aquat. Ecosyst. Are the effects of an invasive crayfish on lake littoral macroinvertebrate communities consistent over time? T. J. Ruokonen F. Ercoli H. Hämäläinen 417 31 2016 full_text 10.1051/kmae/2016018 1961-9502 Knowledge & Management of Aquatic Ecosystems Knowl. Manag. Aquat. Ecosyst. Introduced alien signal crayfish (Pacifastacus leniusculus) in Finland − uncontrollable expansion despite numerous crayfisheries strategies Timo J. Ruokonen Rosanna Sjövik Esa Erkamo Jouni Tulonen Fabio Ercoli Harri Kokko Japo Jussila 419 27 2018 full_text 10.1051/kmae/2018016 FRESHWATER CRAYFISH: Numerous Population Crashes of Wild Signal Crayfish (<i>Pacifastacus leniusculus</i>) in Southern Finland
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Freshwater Crayfish 20(1): 73-79 (2014)


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Numerous Population Crashes of Wild Signal Crayfish (Pacifastacus leniusculus) in Southern Finland

Jussila J, Makkonen J, Kokko H and Mäkinen P  e-mail link

Published Online: 12/31/2014


The alien signal crayfish (Pacifastacus leniusculus) was introduced into Finland, and then more broadly in Europe, with the expectation that it would be a suitable substitute for the native crayfish that was eradicated by crayfish plague (Aphanomyces astaci) epidemics. Signal crayfish introductions were promoted and the initial results indicated the stocking was successful. Later, there have been several cases showing that the initial conclusions were premature, and that signal crayfish stocks were struggling in Nordic countries. Here we present the first data on wild signal crayfish population declines and crashes in Kanta-Häme, Finland, where a minimum of 29 signal populations have collapsed during the past decade (a total of 39% of stocked populations). These populations were mainly inhabiting small water bodies (less than 1000 ha) and were all commercially productive (> 1 CPUE) before the collapse. Our data indicates that success of signal crayfish introductions should only be assessed after this alien species has achieved the carrying capacity of the aquatic ecosystem. In light of our results, the early assessments of the suitability of the signal crayfish to successfully inhabit European aquatic ecosystems should be carefully reconsidered.

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Jussila J, Makkonen J, Kokko H and Mäkinen P. (2014). Numerous Population Crashes of Wild Signal Crayfish (Pacifastacus leniusculus) in Southern Finland. Freshwater Crayfish 20(1):73-79. doi: 10.5869/fc.2014.v20-1.73



Author Information

Japo  Jussila,* Department of Biology, University of eastern Finland, P.O.Box 1627, Kuopio, Savo, Finland70211. E-mail:

Jenny  Makkonen, Department of Biology, University of Eastern Finland, P.O.Box 1627, Kuopio, Savo, Finland70211. E-mail:

Harri  Kokko, Department of Biology, University of Eastern Finland, P.O:Box 1627, Kuopio, Savo, Finland70211. E-mail:

Petri  Mäkinen, Hämeenlinna office, Häme Fisheries Advisory Center, Vanajantie 10b, Hämeenlinna, Kanta-Häme, Finland13110. E-mail:

Corresponding Author indicated by an *.


Publication History

   Manuscript Submitted: 11/6/2014

   Manuscript Accepted: 12/11/2014

   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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