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Signal crayfish in Lake Saimaa could be maladapted to the local conditions due to Aphanomyces astaci infection: A seven-year study

Jussila, Japo and Tiitinen, Vesa and Edsman, Lennart and Kokko, Harri and Fotedar, Ravi (2016). Signal crayfish in Lake Saimaa could be maladapted to the local conditions due to Aphanomyces astaci infection: A seven-year study. Freshwater Crayfish. 22:1, 53-60
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Official URL: http://dx.doi.org/10.5869/fc.2016.v22-1.53

Abstract

We conducted a seven-year survey (years 2009 to 2015) of the Lake Saimaa signal crayfish population. Lake Saimaa is the largest single waterbody in Finland, with a productive fishery and crayfishery. The signal crayfish were introduced to Lake Saimaa in mid-1990's and a commercial fishery was initiated in the mid-2000s. At first, there was a small proportion of noble crayfish among the catch, but after 2007, an acute crayfish plague epidemic eradicated them, and the signal crayfish stock started showing frequent gross symptoms of chronic crayfish plague infection (e.g., melanised lesions, eroded uropods and pleopods, lost appendages with melanised stumps). This stock now shows gross symptoms of the infection at a rate of 45% to 79% of the annual trap catch, in addition to showing signs of eroded swimmeret symdrome (ESS) at a rate of 2.8 to 15.4%. The CPUE has remained rather low, between one and three crayfish throughout the survey, while the proportion of the commercial grade catch has been between 35% and 68% of the total catch. The signal crayfish populations in Lake Saimaa are still rather fragmented, and production is low. It appears that the Lake Saimaa signal crayfish population has developed slowly and is producing less than expected.

Authors/Creators:Jussila, Japo and Tiitinen, Vesa and Edsman, Lennart and Kokko, Harri and Fotedar, Ravi
Title:Signal crayfish in Lake Saimaa could be maladapted to the local conditions due to Aphanomyces astaci infection: A seven-year study
Series/Journal:Freshwater Crayfish (2076-4332)
Year of publishing :2016
Volume:22
Number:1
Page range:53-60
Number of Pages:8
Publisher:International Association of Astacology
ISSN:2076-4332
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Zoology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Other Veterinary Science
Keywords:commercial trapping, crayfish catch, crayfish plague, disease, ESS, Pacifastacus leniusculus
URN:NBN:urn:nbn:se:slu:epsilon-e-3967
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3967
ID Code:14059
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:21 Feb 2017 07:22
Metadata Last Modified:21 Feb 2017 07:22

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