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In this study the involvement of several humoral immune parameters of Atlantic cod (Gadus morhua L.) were studied in granuloma formed as a result of infection by Aeromonas salmonicida ssp. achomogenes. The results showed a clear association of immune parameters within the granuloma, in particular th...
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Approximately 8 weeks after a chlorine insult associated with the city water supply, shortnose sturgeon, Acipenser brevirostrum (L.), from one group presented with small (3-4 mm) irregular foci of cutaneous pallor that involved the dorsocranial integument with progressive ulceration of the nascent l...
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Differentiating salient histopathologic changes from normal anatomic features or tissue artifacts can be decidedly challenging, especially for the novice fish pathologist. As a consequence, findings of questionable accuracy may be reported inadvertently, and the potential negative impacts of publish...
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Severe ulcerative, necrotizing bacterial dermatitis, panniculitis and myositis occurred in at least 6 Atlantic salmon cage sites in New Brunswick in 1990. Mortality was due to invasion by opportunistic bacteria, or osmotic failure due to excessive ulceration. Mortality up to 10% on individual cages ...
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Infectious salmon anaemia virus (ISAV) was isolated from farmed Atlantic salmon (Salmo salar) associated with an outbreak of haemorrhagic kidney syndrome in the Bay of Fundy, Canada. The virus induced cytopathic effects in salmon head kidney cell line SHK-1 from Atlantic salmon and was positively co...
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The cause of death in a postsmolt, Atlantic salmon population with elevated levels of mortalities was investigated. Diagnosis of a rickettsia-like organism was based on gross pathology, histopathology, differential staining, electron microscopy and fluorescent antibody tests. The course of the infec...
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This report describes the clinical and histopathological features of infectious salmon anaemia virus infection in salt water farmed Atlantic salmon in the Bay of Fundy, New Brunswick, in the late summer of 1997. The virus was isolated from several sites by culture on SHK-1 cells and confirmed by mon...
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Pigmented salmon syndrome is described in this review. It is a non-infectious haemolytic anaemia with associated clinical jaundice of Atlantic salmon (Salmo salar), caused by exposure to a combination of chemical pollutants. The disease has been restricted to the migrating adult Atlantic salmon popu...
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In 1999, disease outbreaks in juvenile Atlantic cod Gadus morhua that showed the classic signs of viral encephalopathy and retinopathy (VER) were reported in Nova Scotia. Brain and retinal tissues from moribund cod showed diffuse degenerative vacuolative encephalopathy and degenerative histiocytic r...
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The applicability of counter-immunoelectrophoresis (CIE) as an assay technique for the detection of precipitating antibody to R. salmoninarum (BKD) in the serum of chinook salmon ( Oncorhynchus tshawytscha ) was explored. Soluble antigen preparations of R. salmoninarum were obtained by precipitatio...
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Utilization of finfish and aquatic invertebrates in biomedical research and as environmental sentinels has grown dramatically in recent decades. Likewise the aquaculture of finfish and invertebrates has expanded rapidly worldwide as populations of some aquatic food species and threatened or endanger...
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A massive fish kill affecting exclusively common carp (Cyprinus carpio carpio) in the St. Lawrence River, Quebec, Canada, during the summer of 2001 was investigated by use of laboratory diagnostic methods and by an attempt to experimentally induce the disease. The ultimate causes of mortality were o...
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The factors affecting the horizontal transmission of infectious salmon anaemia virus (ISAV) among naive Atlantic salmon Salmo salar maintained in freshwater were examined. The ratio of injected to naive cohabitants was varied and mortality was monitored. Whether ISAV transmission in freshwater requi...
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Prolonged starvation resulting in sublethal condition factor values was hypothesized to have a detrimental effect on short-term growth capacity upon refeeding. Cod (Gadus morhua) were food-deprived and their length and mass measured before refeeding and after 3, 6, 9 and 12 weeks of ad libitum feedi...
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Administration of erythromycin phosphate to salmonid fish by injection or immersion to control Renibacterium salmonicola infection is reviewed. Alternatives to antibiotic chemoprophylaxis are discussed. Research was needed on drug resistance in R. salmonicola..
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The riverine location of haematotoxic discharges was determined by exposing adult captive Atlantic salmon to River Don water in situ. Experiments were conducted using a control group and 4 test groups at different distances downstream from a paper mill and field drain discharges. Significant changes...
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Freshly run adult Atlantic salmon (Salmo salar) returning to the River Don (Aberdeenshire, Scotland) show periodic epidemics of a fatal disease of the blood and liver, characterised by hyperbilirubinaemia, haemolytic anaemia and structural damage to the liver. Since previous studies have ruled out a...