. Energy News .

Assay developed to rapidly detect disease that hurt oyster industry
by Staff Writers
Corvallis OR (SPX) Jun 10, 2013

File image.

Scientists in the College of Veterinary Medicine at Oregon State University have developed a new, inexpensive and precise way to detect the toxin secreted by Vibrio tubiashii, a bacterial disease that a few years ago caused millions of dollars in losses to the oyster aquaculture industry in the Pacific Northwest.

When perfected and commercialized, the new assay should give oyster growers an early warning system to tell when they have a problem with high levels of this toxin and must take quick steps to address it. Findings were just published in the Journal of Microbiological Methods.

V. tubiashii has caused major problems for oyster growers in recent years, especially in 2007 when a major outbreak almost crippled the industry. When the bacteria and the toxin it produces reach unacceptably high levels, they can kill the tiny seed oysters before they have a chance to grow.

"We still need to improve the sensitivity of the test and better quantify results, but it should provide information in about 30 minutes that used to take three or four days," said Frances Biel, a faculty research assistant in the OSU Department of Biomedical Sciences. "That type of rapid detection will let oyster growers know they have a problem while they can still do something about it."

The oyster die-offs that began happening in the late 2000s appear to have various causes, researchers say, including changes in ocean acidification. Some measures were taken to help deal with the acidification, but widespread die-offs continued to occur that couldn't be linked to that problem. The vibriosis disease caused by this bacteria was found to be a major concern. The largest shellfish hatchery on the West Coast, in Oregon's Netarts Bay, faced near closure as a result of this crisis.

"Shockingly little was known about V. tubiashii at first, and the toxins that it produces," said Claudia Hase, an OSU associate professor of veterinary medicine. "It secretes a zinc-metalloprotease compound that's toxic to shellfish, and that's what our new assay is able to detect."

Besides oysters, this bacteria and toxin can also affect shrimp, clams and other marine species important to aquaculture.

The new assay uses a "dipstick" that has proven superior to another approach which was tested, and conceptually it's similar to a human pregnancy test. It uses monoclonal antibodies that recognize the particular toxic protein of concern.

Marine food farming around the world depends on hatchery and nursery production of large quantities of high quality, disease-free larvae, experts said. Vibriosis in various species has been linked to major problems around the world since the late 1970s. This and other research at OSU has made significant progress in understanding the pathogenicity and toxicity of V. tubiashii.

Aside from farmed oysters and other seafood, there have also been declines of wild shellfish in some locations in recent years on the West Coast. It's likely that increasing levels of vibriosis are related to that, researchers said. Declining coral reefs also suffer from a closely related bacterial species.

This research was supported by the U.S. Department of Agriculture and the National Oceanic and Atmospheric Administration.


Related Links
OSU College of Veterinary Medicine
Farming Today - Suppliers and Technology

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Get Our Free Newsletters
Space - Defense - Environment - Energy - Solar - Nuclear


China, Argentina to increase soybean, corn trade: official
Buenos Aires (AFP) June 9, 2013
Argentina and China have agreed to expand their commercial ties by increasing soybeans and corn exports to the Asian country, Buenos Aires said Saturday. "China approved three transgenic soybean and corn" varieties, Argentine Agriculture Minister Norberto Yahuar said in a statement. "In the next season we will be using these approved seeds and obviously, we will be able to sell more," th ... read more

NASA Builds Sophisticated Earth-Observing Microwave Radiometer

New maps show how shipping noise spans the globe

Magnetospheric Multiscale Mission Team Assemble Flight Observatory

Elevated carbon dioxide making arid regions greener

Lockheed Martin Completes Functional Testing of First GPS III Satellite Bus Electronic Systems

Glitch puts off Indian navigation satellite launch by a fortnight

Orbcomm And Cartrack Deliver Telematics Solution For African Market

Narayansami Inaugurates ISRO Navigation Centre

Brazilian official resigns over indigenous protests

Brazil police deployed to contain land feud

Brazil grapples with indigenous land protests

Forest, soil carbon important but does not offset fossil fuel emissions

Climate change raises stakes on US ethanol policy

Scotland gives green light to $710M wood biomass heat-power plant

Enzyme from wood-eating gribble could help turn waste into biofuel

Molecular switch for cheaper biofuel

US DoI Approves SolarReserve's 100 MW Arizona Solar Power Project

Greenwood Biosar Commences Construction of One of Vermont's Largest Solar Arrays

Growing Demand for New Production Homes with Solar

Clean Energy Collective Awarded Three Additional Solar Gardens

Enovos opens 10 MW wind farm

Quantum To Buy 10 Megawatt Trout Creek Wind Farm

Uruguay deficit likely to speed windpower plans

Romania decree threatens green energy projects

Germany's top court hears case against giant coal mine

Glencore Xstrata cancels coal export terminal plans

Proposed U.S. Northwest coal export project scrapped

China mine accident kills 22: state media

China Nobel winner's relative gets 11 years in jail

Chinese website bans searches for 'yellow duck'

Obama urged to press China to free 16 prisoners

China blocks Tiananmen anniversary remembrance

The content herein, unless otherwise known to be public domain, are Copyright 1995-2012 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement