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 Scientists on the road to discovering impact of urban road dust
18.01.2018 | University of Alberta

nachricht Gran Chaco: Biodiversity at High Risk
17.01.2018 | Humboldt-Universität zu Berlin

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: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Polymers Based on Boron?

18.01.2018 | Life Sciences

Bioengineered soft microfibers improve T-cell production

18.01.2018 | Life Sciences

World’s oldest known oxygen oasis discovered

18.01.2018 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>