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Aquaculture health
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The Department of Fisheries will begin survey work next week to confirm the presence and check the extent of a marine pest, which has not previously been found in WA. This green seaweed, formally known as Codium fragile ssp. tomentosoides, has recently been identified in a sample of macroalga taken at Albany’s Town Jetty. Experts agree this particular seaweed is difficult to tell apart from some other species of Codium, which are not defined as marine pests. It has previously...
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AN international fish health conference has offered a global view of the current situation of Chile’s salmon industry now under attack by a violent outbreak of ISA virus. The outbreak has already caused over two million salmon to be destroyed. The event which took place in Puerto Montt last Friday was entitled “Current situation of the ISA Virus outbreak in Chile: pandemic and pathologic aspects and diagnosis.” The opening lecture was delivered by veterinary...
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A Michigan Technological University professor has developed a new water treatment that could help keep a deadly fish disease out of Lake Superior. David Hand, a professor of civil and environmental engineering at Michigan Tech, has devised a simple way to treat ballast water in vessels ranging from pleasure craft to ore boats. His method is designed to kill the virus that causes viral hemorrhagic septicemia (VHS), an often-fatal disease that has been attacking fish populations in the...
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The Salmon Infectious Anemia, ISA, virus keeps spreading in Chile according to the latest release from the country’s Sernapesca (Nacional Fisheries Service) reports the press from Puerto Montt. Pitihorno farms from Multiexport and Buill from Salmones Humboldt (belonging to Pesquera Coloso and Salmones Igesur) were added to the list of ISA outbreaks. This means the 19 outbreaks listed last May 23 have now increased to 21. The list includes nine farms from Norway’s Marine Harvest,...
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With the largest shrimp breeding area in the south, Ca Mau Province is increasing its production of disease-free breeder shrimp to supply local farmers. Ngo Hoang Son, head of Ca Mau Province’s Aquatic Animal Health Bureau, said the rise in production had helped reduce an epidemic of shrimp disease. "It has also helped secure food hygiene and safety," Son said. The southernmost province now has 250,000 ha of shrimp and breeds more than 12 billion shrimp a...
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For members of the multimillion-dollar West Coast shellfish industry, their world is the oyster. Unfortunately, the oyster industry's ability to meet rising demands is hampered by two species of burrowing shrimp. So Agricultural Research Service (ARS) scientists are collaborating with colleagues from Washington State University and Oregon State University to develop sustainable shrimp-control strategies. Ghost shrimp and mud shrimp inhabit the tideflats in estuaries where West...
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An important seminar aimed at addressing the problem of pancreas disease on salmon farms was held yesterday at the Marine Institute in Oranmore, Co. Galway. The seminar, which was held under the banner of the Tri-Nation Pancreas Disease Group, brought together experts and industry practitioners from Norway, Scotland and Ireland to exchange information, ideas and research findings in order to develop effective strategies in controlling the disease, which has caused so many problems for...
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There are fears a deadly shellfish virus could infect Tasmanian and South Australian waters within months. Tasmania's Abalone Council is supporting calls for a ban on human activity on stretches of the Victorian coastline. The ganglioneuritis virus has jumped 20 kilometres along the Victorian coastline towards Port Philip Bay. Dean Lisson from the Tasmanian Abalone Council says the virus is spreading quickly. "I think there's every chance that some time in the...
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A team of researchers at the University of Prince Edward Island's Atlantic Veterinary College has developed the world's first vaccine that is effective against a destructive microsporidian parasite of salmon. "Although there are many diseases of fish, animals and humans caused by microsporidian parasites, there have been no successful treatment or prevention methods against these enigmatic disease-causing organisms until now," says Dr. David J. Speare (DVM, DVSc), lead...
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Major feed company Skretting announced today it has entered into a contract with Norwegian company Calanus for the development and documentation of a product based on the marine zooplankton Calanus finmarchicus to counteract sea-lice infestations in salmon and trout. Commercial scale field trials by selected farmers in Chile and Norway are now starting. Pelagic stages of Calanus finmarchicus and the infective stage of salmon lice are derived from a common ancestor and have many...
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The regulation of a sea lice medicine, not currently in use on Scottish fish farms, is being consulted on by SEPA, the Scottish Environment Protection Agency. SEPA is seeking views from interested parties on its proposal to introduce a method for licensing the use of a new sea lice medicine containing the active ingredient deltamethrin. The deltamethrin product has been sold for a number of years in Norway under the brand name "Alphamax" but is soon to be introduced in the...
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Together with the Norwegian College of Fishery Science, NOFIMA, the Norwegian School of Veterinary Science, Bodø Regional College and the vaccine company PHARMAC AS, the Institute of Marine Research has been awarded NOK 44 million for a major Norwegian-Indian research project that aims to develop new vaccines for fish and shrimp. The project will run for four years and the consortium will collaborate with seven extremely competent Indian research institutions. The cooperative project...
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A sea squirt that threatens New Zealand’s mussel industry may be stopped by a simple and environmentally safe treatment – fresh water – developed by biosecurity scientists at Cawthron in Nelson. Didemnum vexillum is a spongey textured, light mustard coloured marine organism originally brought to New Zealand on the hull of a steel logging barge from the Philippines. It thrives on underwater surfaces like wharf piles, boat bottoms, mussel lines and salmon cages. When a mussel line is...
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Vibrio infections usually occur in fish from marine and estuarine environments, and have been reported throughout the world. Occasionally, vibriosis is reported in freshwater fish. The disease can cause significant mortality (=>50%) in fish culture facilities once an outbreak is in progress. Common names for Vibrio infections of fish include "red pest" of eels, "salt-water furunculosis", "red boil", and "pike pest". Vibrio infections can spread rapidly when fish are...
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THE Texas-based biopharmaceutical company CytoGenix, Inc. has announced it has completed an agreement with Taiwan Cobia Inc. (TCI) to develop DNA vaccines against fish viruses. Under this Agreement, CytoGenix will develop DNA vaccines against selected viruses and TCI will vaccinate the fish and test immunological responses. Commenting, Cory Huang, president and chief executive officer of TCI, said that while aquaculture is one of the fastest growing food producing sectors in the...
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IN preliminary trials, NOAA Sea Grant researchers have for the first time demonstrated the feasibility of using a live-attenuated vaccine to prevent the deadly Streptococcus iniae infection in fish. The success raises the possibility of being able to inoculate hybrid striped bass, tilapia, rainbow trout and other cultured species orally through feed, instead of having to inject individual fish – a prohibitively labour-intensive process for American farms. Besides the economic...
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Fungi are a group of organisms called heterotrophs that require living or dead matter for growth and reproduction. Unlike plants, they are incapable of manufacturing their own nutrients by photosynthesis. Fungi are present everywhere--in saltwater or fresh water, in cool or warm temperatures. In most cases, fungi serve a valuable ecological function by processing dead organic debris. However, fungi can become a problem if fish are stressed by disease, by poor environmental...
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A series of key aquaculture events and presentations have confirmed Schering-Plough’s ever growing presence and support in S.E. Asia. Aquaculture is continuing to develop at a pace in the region where the demand for Tilapia is especially strong. As producers look to establish long-term and sustainable operations, the focus on health management becomes crucial. Whilst the returns are attractive, endemic disease is a factor in Asia as much as anywhere else. Schering-Plough’s strategy is to work...
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VHS, or viral hemorrhagic septicemia in its long form, is, as its name implies, a virus that attacks freshwater and saltwater fish with apparent impunity. Common in trout hatcheries in Europe and suspected to cause die-offs of Pacific salmon in the Northwest, the disease appeared in 2006 in the Great Lakes in a form not before seen. It hasn’t been found in Colorado nor any of the adjacent states, but if it’s anything like zebra snails, which recently were found in Pueblo Reservoir, the...
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A University of Alberta study shows, for the first time, that parasitic sea lice infestations caused by salmon farms are driving nearby populations of wild salmon toward extinction. The results, appearing in the December 14 issue of the journal Science, show that the affected pink salmon populations have been rapidly declining for four years. The scientists expect a 99 per cent collapse in another four years, or two salmon generations, if the infestations continue. "The...
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