Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Live seafood trade linked to species invasions

24.09.2003


’Fresh’ shellfish in markets still alive enough to spawn



The global live seafood trade is barely regulated even though it could be a significant conservation threat. New research shows that "fresh" shellfish sold in markets are still alive enough to feed – and so presumably to spawn. This suggests that the seafood trade could spread invasive non-native marine species around the world.

It wouldn’t take much. "Introduced species can spread throughout entire ecosystems and across biogeographical regions from a few individuals released at single sites," say John Chapman and Todd Miller of Oregon State University’s Hatfield Marine Science Center in Newport, and Eugene Coan of the California Academy of Sciences in San Francisco in the October issue of Conservation Biology.


While some of the non-native species sold in Pacific Northwest markets are already established or cultured in local waters, many are not. "Their unplanned, unsanctioned introductions should be controlled or avoided," say the researchers. Invasive marine species are environmentally and economically costly. For instance, the European green crab costs an estimated $44 million per year in mitigation expenses and fisheries losses in northeast Pacific waters.

Chapman and his colleagues focused on trade in clams, mussels and oysters. These bivalves can survive out water for more than two weeks when refrigerated, and are usually mature when sold. This means that "fresh" bivalves sold at markets might be able to spawn if returned to marine waters.

To test whether the live seafood trade could indeed spread non-native bivalves, the researchers assessed whether three non-native species sold in Pacific Northwest markets were still alive enough to feed a day after being returned to seawater. Spawning can be triggered by eating, stress or sudden temperature changes. Two of the species (Manilla clams and Pacific oysters) are already established in Pacific Northwest waters but one (the ocean quahog) is not.

The researchers found that nearly as many ocean quahogs survived in the short-term as the two species already established in Pacific Northwest waters (89% vs. 90% and 100%, for ocean quahogs, Manilla clams and Pacific oysters, respectively). "If released, [ocean quahogs] could potentially spawn and become a threat somewhere in the northeast Pacific Ocean," caution Chapman and his colleagues.

The live seafood trade is already implicated in a number of devastating introductions of non-native marine species, including green crabs and Chinese mitten crabs into northeast Pacific waters. Without regulation, the trade will almost certainly lead to even more species invasions. "The more species and the greater the volumes and distributions of live seafood markets, the more likely something will happen," says Chapman.

The researchers call for policies to safeguard the environment from the live seafood trade, including regulations, education and monitoring programs. "National and international transfers of fresh seafood require....oversight at least as detailed as the live bait and pet trades receive," says Chapman.


###
CONTACT:
John Chapman: 541-867-0235, john.chapman@oregonstate.edu
Todd Miller: Todd.Miller@noaa.gov
Eugene Coan: Gene.Coan@sierraclub.org

John Chapman | EurekAlert!
Further information:
http://conbio.net/scb
http://members.iinet.net.au/~mulataga/ExportProducts.htm
http://www.bigeasyseafood.com/50parpacofli.html

More articles from Ecology, The Environment and Conservation:

nachricht How to detect water contamination in situ?
22.09.2016 | Tomsk Polytechnic University (TPU)

nachricht Quantifying the chemical effects of air pollutants on oxidative stress and human health
12.09.2016 | Max-Planck-Institut für Chemie

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: OLED microdisplays in data glasses for improved human-machine interaction

The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.

“Augmented-reality” and “wearables” have become terms we encounter almost daily. Both can make daily life a little simpler and provide valuable assistance for...

Im Focus: Artificial Intelligence Helps in the Discovery of New Materials

With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.

Elpasolite is a glassy, transparent, shiny and soft mineral with a cubic crystal structure. First discovered in El Paso County (Colorado, USA), it can also be...

Im Focus: Complex hardmetal tools out of the 3D printer

For the first time, Fraunhofer IKTS shows additively manufactured hardmetal tools at WorldPM 2016 in Hamburg. Mechanical, chemical as well as a high heat resistance and extreme hardness are required from tools that are used in mechanical and automotive engineering or in plastics and building materials industry. Researchers at the Fraunhofer Institute for Ceramic Technologies and Systems IKTS in Dresden managed the production of complex hardmetal tools via 3D printing in a quality that are in no way inferior to conventionally produced high-performance tools.

Fraunhofer IKTS counts decades of proven expertise in the development of hardmetals. To date, reliable cutting, drilling, pressing and stamping tools made of...

Im Focus: Launch of New Industry Working Group for Process Control in Laser Material Processing

At AKL’16, the International Laser Technology Congress held in May this year, interest in the topic of process control was greater than expected. Appropriately, the event was also used to launch the Industry Working Group for Process Control in Laser Material Processing. The group provides a forum for representatives from industry and research to initiate pre-competitive projects and discuss issues such as standards, potential cost savings and feasibility.

In the age of industry 4.0, laser technology is firmly established within manufacturing. A wide variety of laser techniques – from USP ablation and additive...

Im Focus: New laser joining technologies at ‘K 2016’ trade fair

Every three years, the plastics industry gathers at K, the international trade fair for plastics and rubber in Düsseldorf. The Fraunhofer Institute for Laser Technology ILT will also be attending again and presenting many innovative technologies, such as for joining plastics and metals using ultrashort pulse lasers. From October 19 to 26, you can find the Fraunhofer ILT at the joint Fraunhofer booth SC01 in Hall 7.

K is the world’s largest trade fair for the plastics and rubber industry. As in previous years, the organizers are expecting 3,000 exhibitors and more than...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Experts from industry and academia discuss the future mobile telecommunications standard 5G

23.09.2016 | Event News

ICPE in Graz for the seventh time

20.09.2016 | Event News

Using mathematical models to understand our brain

16.09.2016 | Event News

 
Latest News

Chains of nanogold – forged with atomic precision

23.09.2016 | Life Sciences

New leukemia treatment offers hope

23.09.2016 | Health and Medicine

Self-assembled nanostructures hit their target

23.09.2016 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>