These reports were not re-published by aquaculture industry websites. Environment and Unregulated Aquaculture Cause Fish Deaths in Philippines and Ongoing The issue: In the week prior to 25 May , there were a series of mortalities in Taal Lake, Batangas, Philippines that culminated in an estimated loss of t of mostly farmed milk fish Chanos chanos and tilapia Oreochromis spp. The mortality of farmed fish in the many lakes of the Philippines occurs annually and usually at the end of the summer season.
This mortality event is the largest since , when 54 tons of milkfish died under similar conditions. The mortality of farmed milkfish and tilapia were reported again in from several lakes in the Philippines.
Investigation during this mortality event revealed low dissolved oxygen levels in the lake. This report was published by GMA News Online on 25 May and initially alleged that local piggeries who were disposing their wastes in the lake were responsible for the mortality of fish in Taal Lake.
Significance and Impact: The massive fish kill in Taal Lake in May was estimated at tons of fish with an estimated total cost of PHP million. This issue highlights the struggles of competing land use practices to provide food security and the unregulated aquaculture practices.
For instance, within a few months following the incident, over illegally-operated fish cages in Taal Lake were dismantled by a multi-government task force in compliance with the environmental limit determined by scientific studies of six thousand fish cages in the lake.
All active Atlantic salmon farms were tested for IHNV and all were reported to have returned negative results on 8 June IHNV is usually sub-clinical in salmon species native to the Pacific area, but it can cause clinical disease and mortality in Atlantic salmon. This outbreak is speculated to have been caused by native sockeye salmon Oncorhynchus nerka migrating past these farms that were found to be infected by IHNV. These migrating salmon were determined to have a higher than average prevalence and intensity of the virus and genotyping studies found it closely resembled the strain common to sockeye from Washington State.
It is unknown why these migrating salmon had a high virus load, although it is speculated that a high virus load is thought to cycle every 7 to 10 years. These fish were not vaccinated against IHNV, which increased their likelihood of becoming infected with this virus. OIE did not immediately report on the outbreak. Significance and Impact: Farmed Atlantic salmon are highly susceptible to IHNV and are likely to have been infected from wild salmon with carrier status migrating past the farms.
This issue demonstrates the importance of farm management practices and monitoring the health of wild fisheries populations that migrate past farms.
CFIA has also established monthly reporting on its website of the detection of all federally reportable aquatic animal diseases. These shrimp present with common symptoms including slow growth, corkscrew swimming, loose shells, pale coloration and an abnormal hepatopancreas.
This syndrome is highly lethal and devastating to the industry and is spreading. The aetiology of EMS is known to be caused by Vibrio parahaemolyticus infected with a phage that releases toxins unpublished data. This report was published in VNEconomyNews and reported that farmers in Mekong Delta were suffering from large scale shrimp mortalities across 40, hectares of farms.
This article was re-published on fishupdate. ProMED published a similar report on 10 June The syndrome was not reported by the OIE. An analysis of web content found a report suggesting of disease problems in China in [6].
Significance and Impact: This syndrome now known to be caused by a pathogenic agent is spreading rapidly. The first few reports published in AH detailed that in June , provinces of the Mekong Delta suffered unprecedented losses with tiger shrimp in 40, hectares of farm area affected.
Over 11, hectares of shrimp farms in Bac Lieu have been destroyed. In hectares of shrimp farms in In Tra Vinh, about million shrimp have died causing a loss of over VND 12 billion. AH created an Emerging Issues blog post [An emerging shrimp disease in Vietnam, microsporiosis or liver disease? New strains of ISAV were isolated from each of these 4 outbreaks. This is the first case of PD detected in Norway north of the Hustadvika line.
The SAV 2 subtype has been detected in numerous farms from central to northern Norway. Norway has managed PD with movement restriction between North and South geographical regions, split along the Hustadvika line. Until recently, this management practice seemed to be effective against PD, which had only been found in the South. This report was published on 7 December in FIS and describes that PD was confirmed on 30 November but no external signs of disease or increase in mortality were evident.
Post analysis revealed a similar report with the same details was published on 5 December by IntraFish. Significance and Impact: The industry has questioned if this management is effective and has applied to change their management strategies for PD. New regulations have now been applied and involve monthly health checks and improved health and hygiene standards.
This is a new variant of oyster herpes virus and has been detected and associated with mortality of Pacific Oysters in UK , New Zealand , Australia , Netherlands and Spain It is possible that this pathogen was always present in the environment. Alternatively, the pathogen could have spread through the unregulated movement of used aquaculture equipment, which is a widely recognized direct entry and exposure pathway for pests and diseases of concern for aquatic animals and the aquatic environment.
The report also highlighted the farm had recently deployed equipment previously used in France to refurbish oyster beds. With respect to the Australian case, AH re-published a report on 7 January A similar report was published on 12 January by The Fish Site.
Significance and Impact: Although the emergence of aquatic animal diseases globally is multifactorial associated with movement of stock, climate change, etc. Interrogation of AH provided evidence of the unregulated movement of used aquaculture equipment, which is a widely recognized direct entry and exposure pathway for pests and diseases of concern for aquatic animals and the aquatic environment.
Internet sites specializing in the online trade of aquaculture equipment, including used equipment, provide producers such as salmon farmers, abalone farmers or oyster farmers with an easy avenue to liquidate farm assets after their stock has been wiped out by disease. As a result of the risk posed by the movement of used aquaculture equipment from disease-affected areas overseas, within weeks of the threat becoming recognized, the Australian Government introduced preventive measures to ensure that all used equipment exported to Australia is decontaminated on arrival DAFF AGD is caused by the protozoan amoeba, Neoparamoeba perurans, and has been a major problem in the Tasmanian salmon industry for the last 20 years.
Gill diseases are prominent throughout the Atlantic salmon industries of Ireland, Scotland and Norway. However, in recent years AGD has become more prominent in the cause of gill disease. East Fortune East Lothian. Hooton Track.
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