Cookies Policy
X

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

The Prevalence of Crayfish Plague (Aphanomyces Astaci) in Two Signal Crayfish (Pacifastacus Leniusculus) Populations in Finland

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Journal of Crustacean Biology

Abstract The occurrence of dark brown melanized spots indicative of the presence of crayfish plague fungus (Aphanomyces astaci Schikora) was investigated in three Finnish lakes inhabited by the introduced American signal crayfish (Pacifastacus leniusculus Dana) in 1979, 1983, 1985–1988, 1990, 1993, and 1994. The crayfish were caught with crayfish traps during August–September, 7–8 weeks after the moult. In one lake in which P. leniusculus population had developed from juveniles imported from Sweden in 1971, the crayfish showed no signs of infection. The lake also contained a population of the native noble crayfish (Astacus astacus L.). The coexistence of the two species for nearly 30 years in the same habitats in this small lake indicates the absence of crayfish plague. In two lakes P. leniusculus populations originated from adults imported from Lake Tahoe, U.S.A., in 1969. In 1979 the prevalence of infected P. leniusculus in the lakes (n = 1,841) was high, 52% in Lake Karisjärvi and 47% in Lake Iso-Majajärvi. By 1988 the prevalence had decreased to only 11% and 12%, respectively. During the 1990s, the number of infected specimens began to increase, reaching 24% in Lake Karisjärvi in 1993, and 18% in Lake Iso-Majajärvi in 1994. The black spots most commonly occurred on the walking legs (40% and 39%, respectively) and the chelae (28% in both lakes). The mean number of spots per crayfish was 2.0 and 2.4; many (43% and 36%, respectively) were > 3 mm in diameter. Crayfish plague does not appear to have affected the P. leniusculus populations in the study lakes in any way, nor have any mortalities been reported in either lake.

Affiliations: 1: a Finnish Game and Fisheries Research Institute, P.O. Box 6, FIN–00721 Helsinki, Finland. Present address: Långvik, FIN–02400 Kirkkonummi ; 2: b (corresponding) Finnish Game and Fisheries Research Institute, P.O. Box 6, FIN–00721 Helsinki, Finland ( kai.westman@rktl.fi)

Loading

Full text loading...

/content/journals/10.1163/20021975-99990099
Loading

Data & Media loading...

http://brill.metastore.ingenta.com/content/journals/10.1163/20021975-99990099
Loading

Article metrics loading...

/content/journals/10.1163/20021975-99990099
2000-01-01
2016-12-07

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
     
    Journal of Crustacean Biology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation