Featured Research

from universities, journals, and other organizations

Eroded swimmeret syndrome, a novel disease of the signal crayfish

Date:
July 16, 2014
Source:
University of Eastern Finland
Summary:
Crayfish researchers have discovered, together with Swedish colleagues, a new disease plaguing female signal crayfish. As the name suggests, eroded swimmeret syndrome (ESS) destroys the swimmerets of female crayfish, weakens their reproductive ability and can increase the mortality of mother crayfish. In Finland and Sweden, the observed declines and sudden plunges in natural populations of signal crayfish can, to some extent, be explained by eroded swimmeret syndrome.

Crayfish researchers at the University of Eastern Finland Department of Biology have discovered, together with Swedish colleagues, a new disease plaguing female signal crayfish. As the name suggests, eroded swimmeret syndrome (ESS) destroys the swimmerets of female crayfish, weakens their reproductive ability and can increase the mortality of mother crayfish. In Finland and Sweden, the observed declines and sudden plunges in natural populations of signal crayfish can, to some extent, be explained by eroded swimmeret syndrome.

Symptoms caused by a fungus

For a couple of years now, eroded swimmeret syndrome has been observed in female signal crayfish in both Finland and Sweden. Over the past year, the syndrome has been a target of intense research, and it has been discovered that female signal crayfish weakened by crayfish plague can contract eroded swimmeret syndrome. Molecular biological studies show that the erosion of the swimmerets and the actual symptoms are caused by a fungus of the Fusarium genus.

"Female signal crayfish use their swimmerets to deposit fertilised eggs under their tail for hatching. Eroded swimmeret syndrome has been discovered to decrease the number of eggs hatched, and the reproductive ability of female signal crayfish missing several swimmerets can be completely compromised," says researcher Japo Jussila of the University of Eastern Finland.

ESS can explain sudden changes in signal crayfish populations

"Eroded swimmeret syndrome is another sad turn in the introduction of a non-native crayfish species to Europe and the Nordic countries. The observed declines in natural signal crayfish populations and their weak ability to recover from these declines can be, to some extent, caused by eroded swimmeret syndrome," Jussila says.

In Finland, eroded swimmeret syndrome has been found in many of the country's big lakes and, in Sweden, the syndrome is widespread in signal crayfish populations experiencing sudden declines. The study was a joint effort between the University of Eastern Finland, the South Karelia Fisheries Centre, the Swedish University of Agricultural Sciences, and Ekoll Ab.

In Finland, a choice has been made to introduce signal crayfish to the southern parts of the country only, but unauthorised introductions continue to take place elsewhere in the country, too. It is feared that signal crayfish and the crayfish plague it carries spreads in healthy signal crayfish populations and noble crayfish populations.


Story Source:

The above story is based on materials provided by University of Eastern Finland. Note: Materials may be edited for content and length.


Cite This Page:

University of Eastern Finland. "Eroded swimmeret syndrome, a novel disease of the signal crayfish." ScienceDaily. ScienceDaily, 16 July 2014. <www.sciencedaily.com/releases/2014/07/140716090730.htm>.
University of Eastern Finland. (2014, July 16). Eroded swimmeret syndrome, a novel disease of the signal crayfish. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2014/07/140716090730.htm
University of Eastern Finland. "Eroded swimmeret syndrome, a novel disease of the signal crayfish." ScienceDaily. www.sciencedaily.com/releases/2014/07/140716090730.htm (accessed September 22, 2014).

Share This



More Plants & Animals News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Cat Lovers Flock to Los Angeles

Cat Lovers Flock to Los Angeles

AFP (Sep. 22, 2014) The best funny internet cat videos are honoured at LA's Feline Film Festival. Duration: 00:56 Video provided by AFP
Powered by NewsLook.com
Washed-Up 'Alien Hairballs' Are Actually Algae

Washed-Up 'Alien Hairballs' Are Actually Algae

Newsy (Sep. 22, 2014) Green balls of algae washed up on Sydney, Australia's Dee Why Beach. Video provided by Newsy
Powered by NewsLook.com
Raw: San Diego Zoo Welcomes Cheetah Cubs

Raw: San Diego Zoo Welcomes Cheetah Cubs

AP (Sep. 20, 2014) The San Diego Zoo has welcomed two Cheetah cubs to its Safari Park. The nearly three-week-old female cubs are being hand fed and are receiving around the clock care. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins