Featured Research

from universities, journals, and other organizations

Frog legs trade may facilitate spread of pathogens

Date:
November 20, 2009
Source:
Smithsonian
Summary:
Most countries throughout the world participate in the $40-million-per-year culinary trade of frog legs in some way, with 75 percent of frog legs consumed in France, Belgium and the United States. Scientists have found that this trade is a potential carrier of pathogens deadly to amphibians.

These are frog legs for sale at a market in Indonesia.
Credit: A. Roselli

Most countries throughout the world participate in the $40-million-per-year culinary trade of frog legs in some way, with 75 percent of frog legs consumed in France, Belgium and the United States. Scientists at the Smithsonian Institution and colleagues have found that this trade is a potential carrier of pathogens deadly to amphibians. The team's findings are published in the scientific journal Frontiers in Ecology, on November 19.

Amphibians are rapidly declining worldwide. More than one-third of the nearly 6,000 amphibian species are threatened with extinction -- disease is one of the main causes. Among the known amphibian pathogens, the parasitic fungus Batrachochytrium dendrobatidis, also known as amphibian chytrid (KI-trid), is a top concern. The fungus, which attacks keratin proteins in the skin of amphibians, including frogs, causes respiratory and neurological damage and eventually death.

"Amphibian chytrid is an unusual example of a disease that is a primary cause of extinction in amphibian species," said Brian Gratwicke, biologist at the Smithsonian's National Zoo and lead author of the team's paper. "In fact, amphibian chytrid has been listed as a likely threat in 94 cases out of the 159 extinct and potentially extinct amphibian species. There are several hypotheses about how amphibian chytrid has spread around the world, but the trade in amphibians for food, bait, pets and laboratory animals has been identified as the most likely mode of spread."

Although consuming amphibian legs is familiar to many people as a culinary curiosity, the global extent of the international trade is unknown. The team of scientists' research focused on 1996 through 2006, during which more than 100,000 metric tons of frog legs were imported from both wild and farmed sources, at a net value approaching half a billion dollars. One kilogram of frog legs averaged about $4 over this period -- a kilogram of frog legs requires 10 to 40 individual animals translating to approximately 100 to 400 million animals per year.

The scientists found no recorded cases of the extinction of a frog species caused by collection for food. However, given the growing importance of aquaculture to supply frog legs to global markets, the team stresses that the risk of disease spread through poorly regulated amphibian trade is probably an even greater risk to amphibian biodiversity than the direct population effects of overharvesting.

In countries such as Indonesia, which exports about 45 percent of all frog legs, the majority of animals are thought to be wild-caught and there is little to no effort to monitor this food source for disease pathogens. "Any trade in live frogs or fresh, un-skinned frog legs presents a substantial risk of the spread of amphibian chytrid," said Gratwicke. "The implementation and enforcement of some key amphibian trade policies could be a cost-effective conservation tool to mitigate disease risks associated with the trade."

The exact origin of amphibian chytrid is unknown, but one theory is that it originated in Southern Africa and was distributed worldwide in the 1950s through the trade of the African clawed frog for pregnancy-testing and other amphibian trade. Amphibian chytrid has been detected in many parts of the United States, but some species are apparently resistant to the fungus, and it is not always associated with amphibian declines. The most dramatic declines have been observed in mountainous parts of Central and South America and Australia where it is responsible for the disappearance and probable extinction of many species.


Story Source:

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


Cite This Page:

Smithsonian. "Frog legs trade may facilitate spread of pathogens." ScienceDaily. ScienceDaily, 20 November 2009. <www.sciencedaily.com/releases/2009/11/091119135642.htm>.
Smithsonian. (2009, November 20). Frog legs trade may facilitate spread of pathogens. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2009/11/091119135642.htm
Smithsonian. "Frog legs trade may facilitate spread of pathogens." ScienceDaily. www.sciencedaily.com/releases/2009/11/091119135642.htm (accessed September 23, 2014).

Share This



More Plants & Animals News

Tuesday, September 23, 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