The disease and the virus
Viral Encephalopathy and Retinopathy is a viral disease affecting more than 50 fish species, both wild and farmed (sea bass, grouper, sea bream, striped jack, flat fish etc.)(OIE, 2016). The disease causes neurological symptoms and increased mortalities. The disease occurrence has a seasonal pattern, with most outbreaks during the summertime, because of the higher temperatures of the water, which favors virus replication. Fish fry and larvae seem to be most susceptible, and in this age-group the disease can cause up to 100% mortality. Transmission of the disease can occur both horizontal (from fish to fish or equipment/feed to fish) and vertically associated (from brood stock to progeny), and the virus is very persistent in the environment, making spread with vectors (such as boats, feed and equipment) possible. As the name suggest, the disease manifest in the central nervous system causing histopathological necrosis in the brain and retina. Affected fish will either show clinical symptoms such as loss of buoyance control, spiral swimming pattern and darkening of the skin, or die before symptoms appear.Continue reading
Viral encephalopathy and retinopathy (VER), also known as viral nervous necrosis (VNN), is a severe neuropathological disease caused by RNA viruses belonging to the Nodaviridae family, genus Betanodavirus. This infectious agent, detected in the early nineties, has rapidly spread worldwide becoming endemic and representing one of the most important limiting factors to the development of mariculture in several countries. Given the expanding host range and geographic diffusion, the disease has recently been included among the most significant viral pathogens of finfish.
The Spanish Ministry of Agriculture and Fisheries, Food and Environment has published the “Annual Indicators Report: Agriculture, Fisheries, Food and Environment 2016”.
Marine and mainland aquaculture are regarded as strategic and the data presented in the survey (from 2015) indicate that the total value of aquaculture production (marine and continental) was 597 million euros, slightly lower (1%) than in the previous year, but steady and higher (6%) than the average of the period 2012-2014.Continue reading
From the 30th to the 31st of May, the European Union Reference Laboratory (EURL) for fish diseases, in Denmark, will host the 21st Annual Workshop.
Around 60 participants from more than 35 countries will attend the workshop, amongst them partners from the MedAID consortium, such as Niccolò Vendramin and Niels Jørgen Olesen from DTU-Denmark, Anna Toffan from IZSVe- Italy, Snjezana Zrncic from HVI-Croatia and Nadia Chérif from INSTM-Tunisia.
The workshop programme can be downloaded here and more information about the workshop and the daily work of the EURL for fish diseases can be found here: www.eurl-fish.eu.
Europe presently consumes twice as much seafood as it produces, with imports filling the gap. Despite this fact, aquaculture accounts for about 20% of production in Europe and directly employs some 85 000 people, mostly in rural and coastal areas. In contrast with the development seen in other non EU Mediterranean countries, aquaculture production is stagnating in Europe. This is the reason why the European Commission has proposed the target of a 20% increase in sustainable aquaculture production in the Mediterranean. With the aim of supporting this objective the MedAID project has been born, and its outcomes are expected to be vital in strengthing European marine fish production.Continue reading