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Oyster

Test Advances Fight Against Bonamia

Date: 
21 May 2013

National Institute of Water and Atmospheric Research (NIWA) and a molecular diagnostic company dnature have developed a DNA test that is more sensitive, and can detect lower levels of infection, than using a microscope.

Bonamia is a microscopic disease of oysters. Although not harmful to humans or animals it kills large numbers of oysters. It has been, and we expect it will continue to be, a recurrent problem in the fishery, says NIWA scientist Keith Michael.

"The great advantage of the new method is that it can detect small amounts of bonamia in an oyster. This means we can detect the

National Institute of Water and Atmospheric Research (NIWA) and a molecular diagnostic company dnature have developed a DNA test that is more sensitive, and can detect lower levels of infection, than using a microscope.
Bonamia is a microscopic disease of oysters. Although not harmful to humans or animals it kills large numbers of oysters. It has been, and we expect it will continue to be, a recurrent problem in the fishery, says NIWA scientist Keith Michael.
"The great advantage of the new method is that it can detect small amounts of bonamia in an oyster. This means we can detect the disease in a bed early before the infection becomes fatal and the oysters are lost to the fishery."
Mr Michael says this new test takes less time, is more cost-effective and can detect a number of different species of bonamia.
"We can detect fatal and non-fatal infections and more accurately predict the total summer mortality of oysters before the season begins. We can test 96 samples at one time instead of examining one at a time under the microscope."

"This new research will help the Bluff Oyster Management Company to develop new ways of minimising the losses of oysters and reducing the spread of bonamia."
The total Bluff oyster population is continuing to grow steadily since bonamia severely reduced the population to 408 million oysters in 2005. The population has steadily rebuilt from 720 in 2009 to 918 million in 2012.
Now there is a wealth of information from research and extensive hands-on knowledge from skippers, oyster population models can reliably predict trends, with research to estimate the total population size carried out every three years.
Consequently, with the growth in numbers, oyster harvests have also grown from the 2005 low of 7.5 million to a harvest of 12 million last year. Harvesting is expected to be higher again this year, closer to the 15 million limit set by the Ministry for Primary Industries (MPI). The oyster season runs from, 1 March and closes 31 August.
The mortality of oysters from diseases has been between 6 and 12 per cent of the population of legal-sized oysters, while the harvest has been close to 1 per cent.
In 2000, NIWA, Bluff Oyster Management Company, MPI and boat skippers started working together to gain a better understanding about the disease.
The oyster industry review pre-season survey information and research before each oyster season to establish an initial harvest level. Oyster skippers meet early in the season to discuss whether their catch observations match the survey results – and they consistently do. Any changes to harvest limits are discussed by the wider management group.
Because there is a long history of research on Bluff oysters providing a good time series of information, NIWA has been able to reliably predict future trends in the oyster population using assessment models developed for the fishery.
NIWA, the oyster industry, and the MPI undertake a number of other research programmes including research to:
-develop tools to better detect disease in oysters, and to understand bonamia and its interaction with the oyster population.
-monitor the abundance of newly settled, small oysters to help predict future trends in the commercial fishery.
-record extensive and detailed information from the fishery in a fishers' logbook programme.
-improve dredge performance and fishing procedures, as oysters can only be harvested by dredging.
-investigate what drives oyster production in different regions of the fishery.
-develop methods to enhance the oyster population, if required, during disease events.
The oyster festival is held this Saturday in Bluff, for more information:
http://www.bluffoysterfest.co.nz/
To view a video about the Bluff oyster industry go to:
http://www.niwa.co.nz/video/bluff-oysters-managing-an-iconic-fishery
Bluff OysterFishery Information:

Location

New Zealand
42° 48' 41.4792" S, 172° 37' 1.8768" E

Infection with Perkinsus olseni ,French Polynesia [OIE Immediate notification]

Report Type:
Host:
Source:
Date: 
15 May 2013

Infection with Perkinsus olseni ,French Polynesia

Information received on 14/05/2013 from Dr Valérie Roy, Chef du département de la qualité alimentaire et de l'action vétérinaire, Département de la qualité alimentaire et de l'action vétérinaire, Service du développement rural Ministère de l'agriculture, de l'élevage et de la forêt , Papeete, French Polynesia

Summary

Report type

Immediate notification (Final report)

Date of start of the event

01/01/2013

Date of pre-confirmation of the event

30/04/2013

Report date

14/05/2013

Date submitted to OIE

15/05/2013

Date event resolved

15/05/2013

Reason for notification

Reoccurrence of a listed disease

Date of previous occurrence

06/12/2012

Manifestation of disease

Sub-clinical infection

Causal agent

Perkinsus olseni

Nature of diagnosis

Laboratory (advanced)

This event pertains to

the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

  • TUAMOTU - GAMBIER ( HAO, HAO )

Total animals affected

Species

Susceptible

Cases

Deaths

Destroyed

Slaughtered

Pearl oyster (Pinctada margaritifera)

30

25

0

0

0

Outbreak statistics

Species

Apparent morbidity rate

Apparent mortality rate

Apparent case fatality rate

Proportion susceptible animals lost*

Pearl oyster (Pinctada margaritifera)

83.33%

0.00%

0.00%

0.00%

* Removed from the susceptible population through death, destruction and/or slaughter;

Epidemiology

Source of the outbreak(s) or origin of infection

  • Horizontal spread through water

Control measures

Measures applied

  • No vaccination
  • No treatment of affected animals

Measures to be applied

  • No other measures

Diagnostic test results

Laboratory name and type

Technology Platform of the Marine Resources Direction (DRM)/IFREMER ( Local laboratory )

Tests and results

Species

Test

Test date

Result

Pearl oyster (Pinctada margaritifera)

polymerase chain reaction (PCR)

30/04/2013

Positive

Future Reporting

The event is resolved. No more reports will be submitted.

 

Location

French Polynesia
17° 35' 36.2832" S, 149° 28' 8.3784" W

User:Ksmmumbb - FreeBSD Indonesia Wiki

Date: 
15 May 2013

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Cheap Los Angeles Clippers jersey - Know Pain No Chains Ministry

Date: 
15 May 2013

Cheap Los Angeles Clippers jersey
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Oyster deaths leave farmers with losses | The Vietnam Times

Date: 
09 May 2013

THANH HOA (VNS)— Aquaculture farmers in the central province of Thanh Hoa have seen large numbers of their oysters die since the beginning of last month, leaving them tens of billions of dong out of pocket.

The deaths wiped out 60-80 per cent of oysters raised across hundreds of hectares of aqua farms at coastal communes in Quang Xuong, Hau Loc, Nga Son and Hoang Hoa districts.

Tran Thi Hien, a farmer in Quang Xuong District's Quang Nham Commune, said the oysters died due to polluted water being discharged into Quang Nham's waterways and fishing areas.

In addition, workers harve

THANH HOA (VNS)— Aquaculture farmers in the central province of Thanh Hoa have seen large numbers of their oysters die since the beginning of last month, leaving them tens of billions of dong out of pocket.
The deaths wiped out 60-80 per cent of oysters raised across hundreds of hectares of aqua farms at coastal communes in Quang Xuong, Hau Loc, Nga Son and Hoang Hoa districts.
Tran Thi Hien, a farmer in Quang Xuong District's Quang Nham Commune, said the oysters died due to polluted water being discharged into Quang Nham's waterways and fishing areas.
In addition, workers harvesting jelly fish have seen the animals die after drifting into tidal areas. Polluted water filled with dead jelly fish also exacerbated the oyster deaths, she said.
More than 30 households raised oysters in Quang Nham Commune. Each household has 1-3ha of oysters. For each hectare, local farmers invest VND450-500 million (US$21,400-23,800) to buy baby oysters and run their business.
Le Van Thuan, a farmer in Hau Loc District's Hai Loc Commune, blamed polluted water discharged in the Kenh De River for the oyster deaths. A number of livestock and poultry farms have been set up along the river.
Thuan said he has 7ha of oysters but dozens of tonnes of them died and he suffered a loss of VND700 million ($33,300).
Cao Thanh Tho, head of the Thanh Hoa Department of Agriculture and Rural Development's Aquatic Product Breeding Division, said samples of water, soil and dead oysters were sent to the Ministry of Agriculture and Rural Development's Department of Animal Health for tests.
No parasite causing diseases were discovered on the oysters.
However, the amount of ammonia in the water and soil exceeded regulated levels by ten times.
Tho said oysters were selling slowly this year so oyster farmers had large stocks in their ponds.
The density of oysters in aqua farms was more than 300 per square metres, while the regulated density is only 150-200 per square metre. The high density resulted in a lack of food for the oysters, which may also have led to the deaths.
An additional factor was that oysters were currently in their reproductive season, a time when their immunity is weak. Meanwhile, the weather in the province has been erratic, said Tho.
Do Quoc Canh, chief of the provincial People's Committee secretariat, said that the committee had received reports and proposals on support for farmers in Hau Loc and Hoang Hoa districts. — VNS

Location

Vietnam
11° 0' 21.2544" N, 107° 45' 14.0616" E

Oyster deaths leave farmers with losses — TalkVietnam

Report Type:
Host:
Source:
Date: 
09 May 2013

THANH HOA (VNS)— Aquaculture farmers in the central province of Thanh Hoa have seen large numbers of their oysters die since the beginning of last month, leaving them tens of billions of dong out of pocket.

The deaths wiped out 60-80 per cent of oysters raised across hundreds of hectares of aqua farms at coastal communes in Quang Xuong, Hau Loc, Nga Son and Hoang Hoa districts.

Tran Thi Hien, a farmer in Quang Xuong District's Quang Nham Commune, said the oysters died due to polluted water being discharged into Quang Nham's waterways and fishing areas.

In addition, workers harve

THANH HOA (VNS)— Aquaculture farmers in the central province of Thanh Hoa have seen large numbers of their oysters die since the beginning of last month, leaving them tens of billions of dong out of pocket.
The deaths wiped out 60-80 per cent of oysters raised across hundreds of hectares of aqua farms at coastal communes in Quang Xuong, Hau Loc, Nga Son and Hoang Hoa districts.
Tran Thi Hien, a farmer in Quang Xuong District's Quang Nham Commune, said the oysters died due to polluted water being discharged into Quang Nham's waterways and fishing areas.
In addition, workers harvesting jelly fish have seen the animals die after drifting into tidal areas. Polluted water filled with dead jelly fish also exacerbated the oyster deaths, she said.
More than 30 households raised oysters in Quang Nham Commune. Each household has 1-3ha of oysters. For each hectare, local farmers invest VND450-500 million (US$21,400-23,800) to buy baby oysters and run their business.
Le Van Thuan, a farmer in Hau Loc District's Hai Loc Commune, blamed polluted water discharged in the Kenh De River for the oyster deaths. A number of livestock and poultry farms have been set up along the river.
Thuan said he has 7ha of oysters but dozens of tonnes of them died and he suffered a loss of VND700 million ($33,300).
Cao Thanh Tho, head of the Thanh Hoa Department of Agriculture and Rural Development's Aquatic Product Breeding Division, said samples of water, soil and dead oysters were sent to the Ministry of Agriculture and Rural Development's Department of Animal Health for tests.
No parasite causing diseases were discovered on the oysters.
However, the amount of ammonia in the water and soil exceeded regulated levels by ten times.
Tho said oysters were selling slowly this year so oyster farmers had large stocks in their ponds.
The density of oysters in aqua farms was more than 300 per square metres, while the regulated density is only 150-200 per square metre. The high density resulted in a lack of food for the oysters, which may also have led to the deaths.
An additional factor was that oysters were currently in their reproductive season, a time when their immunity is weak. Meanwhile, the weather in the province has been erratic, said Tho.
Do Quoc Canh, chief of the provincial People's Committee secretariat, said that the committee had received reports and proposals on support for farmers in Hau Loc and Hoang Hoa districts. — VNS
NGHE AN (VNS)— The central province of Nghe An has suspended 13 companies from mining activities and revoked two mining licenses, provincial authorities said on Tuesday. Illegal mineral tapping in the province has increased since early this year, especially in the province's mountainous districts. The violations led to loss of minerals... [Read more]
A new Decree drawn by the Ministry of Environment will take effect from July 1 in which industrial wastewater fee will hike by ten times, according to the Ho Chi Minh City Department of Environment. Workers take wastewater sample for testing at an industrial zone in HCMC (Photo: SGGP) HCMC discharges 500,000... [Read more]
VGP - The Ministry of Planning and Investment held a workshop in Ha Noi on April 23 to review investment and expenditures for climate change adaptation in Viet Nam. Viet Nam is one of the most vulnerable countries to climate change The workshop was expected to seek in-depth comments on activities... [Read more]
Army unit urged to apply technologies in defence tasks
PANO - The Department for Science, Technology and Environment, under the Ministry of Defence, marked its 55th anniversary on April 10th in the presence of Senior Lieutenant-General Do Ba Ty, Chief of the General Staff, and Nguyen Quan, Minister of Science and Technology. Over the past 55 years of construction and... [Read more]
Boosting Implementation of Education for Sustainable Development Initiative in Vietnam
The Ministry of Education and Training (MOET), UNESCO and Samsung recently organised the launching ceremony for an Education for Sustainable Development (ESD) initiative to be implemented in Vietnam. The initiative is part of a global agreement between UNESCO and Samsung that aims at enhancing the education system's responses to challenges... [Read more]
New Secretaries of Nghe An and Phu Tho Provincial Party Committees elected
Deputy Secretaries of the Nghe An and Phu Tho Provincial Party Committees, Mr Ho Duc Phoc and Mr Hoang Dan Mac were elected as the Secretaries to replace of Mr Phan Dinh Trac and Mr Nguyen Doan Khanh, who were assigned as Deputy Heads of the Central Interior Department. Mr Ho... [Read more]
Vietnam quarry owner gets two years in jail for 18-death rockslide
A court in the central province of Nghe An on Tuesday sentenced a quarry owner to two years in jail for negligence which contributed to a rockslide that killed 18 people in April 2011. The accident that also left seven others injured took place eight months after Phan Cong Chin was... [Read more]
Liberal plastic-bag bans have disgusting results
Conservatives often point out that laws, no matter how benign they may appear, have unintended consequences. They can reverberate in ways that not many people foresaw and nobody wanted: Raising the minimum wage can increase unemployment; prohibition can create black markets. The efforts in many cities to discourage the use of... [Read more]
Ha Noi cracks down on misuse of farmland
HA NOI (VNS)— Ha Noi People's Committee has urged districts to review their management on the use of farm land for public purposes within the first quarter of this year. Under Decree 64-CP issued in September,1993, each commune is allowed to use no more than 5 per cent of its farm... [Read more]
BUSINESS IN BRIEF 22/12
Vietnamese products must improve quality to gain foothold Essential consumer goods are believed to be the strong point of Vietnamese companies, but in reality they are overwhelmed by imported goods because of their better quality, which Vietnamese-made products lack. The Ministry of Industry and Trade has reported that import turnover of milk,... [Read more]

Location

Vietnam
14° 3' 29.9664" N, 108° 16' 37.9164" E

Galway senator fights for oyster disease free status for Ballinakill Bay

Date: 
30 Apr 2013

Trevor O' Clochartaigh says Ballinakill bay, which is close to Letterfrack, is going to lose its status because an oyster has been affected by the ostreid herpes virus.

The Marine Institute has been monitoring the Bay for the last number of years.

The Sinn Fein Senator is expected to raise the issue in the Seanad this evening.



St Patrick's Day Parades from around the county...GIVING THEIR BLESSING . . . Moyne Station Area represented by Evan and Ava Roche, Kevin Mitchell, Ethan,

Trevor O' Clochartaigh says Ballinakill bay, which is close to Letterfrack, is going to lose its status because an oyster has been affected by the ostreid herpes virus.
The Marine Institute has been monitoring the Bay for the last number of years.
The Sinn Fein Senator is expected to raise the issue in the Seanad this evening.
 

Location

Ballinasloe
Ireland
53° 19' 43.5432" N, 8° 13' 37.0092" W

Louboutin Shoes L0A @ blog :: 隨意窩 Xuite日誌

Date: 
30 Apr 2013

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La sobreexplotación de almeja en Arousa pone en riesgo la producción [Cockle deaths - Spain]

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Date: 
27 Apr 2013

La mortandad del berberecho y el exceso de plomo en el relojito reducen los recursos habituales en la ría de Arousa - Las riadas fueron insuficientes para sanear los bancos

a.touriño - vilagarcía 29.04.2013 | 07:35 Parques de cultivo de Carril, en Vilagarcía de Arousa. // Iñaki Abella

Actividad de los mariscadores a flote en Os Lombos do Ulla. // Iñaki Abella

El marisqueo en la ría de Arousa se encuentra en franco peligro debido a la sobreexplotación de almeja como consecuencia de la muerte del berberecho y la prohibición de extracción del relojito desde hace ya tre

The shellfish in the Ria de Arosa is in real danger due to overexploitation due clam cockle death and clockwork extraction ban for three years.

The industry is going through one of the most difficult situations in recent years are beginning to appear as clear signs of major economic resource scarcity can still exploit shellfish in different production areas of the clam.

The common cockle is extinguished both rail as I Lombos and other production areas, and in principle does not appear next recovery unless done right now reseeding with male specimens from other production areas. "We need to bring breeding males cockles recover again," says the biologist Xusto Otero.

The rail was in gradually disappeared almost a year ago. At first he was very weak because a parasite was affecting several organs but then appeared marteiliosis bacteria that continued to undermine the mollusk and finally there was no more appropriate weather conditions who provoked a flood of fresh water that would eliminate all the bacteria, summarizes the vilagarciano technician.

The almost total disappearance of this resource is added to the ban on removing the "clock" for two or three years due to its high content of lead.

At present, the river is overloaded with this bivalve less appreciated by the consumer but the extraction was complementary to the other species, allowing better management of resources.

The ban has caused the clockwork invasion of this species in the sea. "There is an excess of this bivalve in the estuary, but not yet remove it lifted the ban," said Otero.

The alert was recorded to check that this mollusk had a high rate of lead, which can result in health problems for consumers in the long run.

It was observed that this species contained indexes above 1.5 milligrams of lead, which exceeded the threshold permitted by the World Health Organization.

But the resource has other limitations, as the Regional Administration imposes size restrictions, so that can not be captured if they are below 30 mm.

Stand technicians it is a bivalve which has a large absorption capacity of the lead, but doing so will gradually so that the content of this element is less young unit. The problem is that the "relojitos" small and can not be removed, much less commercialized.

Yes they are likely to sell those exceeding 30 mm in length, but it is adult specimens have absorbed a lot more lead so mean consumption risks to humans.

For these causes, it seems remote that Spanish health authorities to lift the ban back of this species that until recently compensated biological rest of the other complementary productions.

The other problem Cockle hindered recovery must be sought in the weather this year. Indeed was a year of high rainfall but insufficient to cause massive freshwater inputs bacteria housecleaner sea.

"Just lowered salinity and this contributed to the death of some mollusks but was insufficient to cause absolute cleanliness in shellfish beds," said Otero Xusto.

It should be emphasized that the cockle is a species that usually breed with great ease during the same year, so it may even be a situation that after having gone back to emerge in huge amounts in the following season.

The problem is that this is already the second campaign without this resource, which is on alert to both the authorities and the industry itself.

What I found in lane is called cockle birollo, less appreciated by the consumer but begins to have claim to have disappeared common.

It should be emphasized that in the market of rail last month sold a total of 7,500 kilos of this species less noble and even reached fairly reasonable prices.

The habitat of this cockle are muddy areas, but having disappeared common begins to proliferate elsewhere, due to the colonization process has begun.

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Location

Ria de Arosa
Spain
42° 35' 7.5984" N, 8° 53' 21.5268" W
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