Abstract Background Infectious salmon anaemia (ISA) is a viral disease of marine-farmed Atlantic ( Salmo salar ) caused by ISA virus (ISAV), which belongs to the genus Isavirus , family Orthomyxoviridae . The considered be carried marine wild fish and for over 25 years has major outbreaks in Northern hemisphere. In Southern hemisphere, ISAV was first detected Chile 1999 Coho Oncorhynchus kisutch ). contrast classical presentation salmon, presence until now only been associated with clinical...

To improve sustainability in the aquaculture industry plant meals are increasingly used to replace fish meal feed. Solvent-extracted soybean (SBM) is an attractive protein source for feed because of its high content, favorable amino acid profile, and low cost. In Atlantic salmon (Salmo salar), SBM at levels causes meal-induced enteritis (SBMIE). Few studies have been done with Pacific salmon, none those included intestinal inflammation analysis. gain more insight into salmonid responses SBM,...

Heart and skeletal muscle inflammation (HSMI) is a significant disease affecting Atlantic salmon (Salmo salar) production in Norway but has had limited impact to North America. The causative agent of HSMI piscine orthoreovirus genotype 1 (PRV-1), variation between regions suggested be at least partially driven by genetic the virus. Using controlled laboratory injection challenges, we corroborate variations outcomes for three PRV-1 isolates (PRV-1a from eastern Pacific, PRV-1a western...

Abstract Background Infectious salmon anaemia (ISA) virus (ISAV), which causes ISA in marine-farmed Atlantic salmon, is an orthomyxovirus belonging to the genus Isavirus , family Orthomyxoviridae . ISAV agglutinates erythrocytes of several fish species and it generally accepted that receptor destroying enzyme dissolves this haemagglutination except for erythrocytes. Recent work indicates isolates are able elute from cause low mortality challenge experiments using salmon. Previous on...

In 1999, disease outbreaks in juvenile Atlantic cod Gadus morhua that showed the classic signs of viral encephalopathy and retinopathy (VER) were reported Nova Scotia. Brain retinal tissues from moribund diffuse degenerative vacuolative histiocytic retinitis. The affected brain observed to be positive for nodaviral antigens by means immunohistochemical techniques. We partially characterized a nodavirus-like agent eye cell culture using reverse-transcriptase polymerase chain reaction primer...

With respect to salmonid aquaculture, one of the most important bacterial pathogens due high mortality and antibiotic usage is causative agent typical furunculosis, Aeromonas salmonicida spp. (Asal). In Atlantic salmon, Salmo salar, host response during infections with Asal well documented, furunculosis outbreaks resulting in significant commercial settings. However, less known about host-pathogen interactions emerging aquaculture species, Arctic charr Salvelinus alpinus. Furthermore, there...

A systemic infection of a Rickettsia-like organism (RLO) in cultured sea bass is described for the first time. In hatcheries, clinical signs were lethargy, inappetence and discoloration. Twenty days after transfer to cages from hatcheries where disease existed, fish showed erratic abnormal swimming behaviour, loss orientation, lethargy. Cumulative mortality colder months year reached 30% 80% cages. Surviving did not show any RLO subsequent year. Evidence distribution was supported by...

Abstract Lepeophtheirus salmonis infections in Atlantic salmon, S almo salar , have been characterized by little to no hyperplastic response and a biphasic immune that results chronic inflammation with tissue repair as the infection progresses. We hypothesized C p G administration prior lice exposure would enhance epithelial inflammatory mechanisms boost A tlantic salmon L . leading greater protection against infection. administered multiple exposures of two groups compared responses...

Abstract There is tremendous variation in life-history strategies among anadromous salmonids. Species that enter the ocean environment at small sizes (< 20 g) are likely under more physiological pressure from pathogens; however, little data available on responses these early stages. With this mind, we performed salmon louse challenges with Coho either immediately after seawater entry (SW; ca. 10 or 30 days SW (ca. g). Irrespective of size time SW, parasites were rapidly rejected by host,...

The present study describes culture, virulence and antigenic characteristics of a Rickettsiales-like organism (RLO) associated with mortality in farmed Atlantic salmon eastern Canada. Clinical disease was reproduced naive parr by intraperitoneal i.p. inoculation kidney homogenate from naturally infected fish. Pure cultures RLO were isolated into chinook embryo (CHSE) cells experimentally caused cytopathic effect cultured CHSE-214 typified coalescing areas swollen that eventually detached the...

A massive fish kill affecting exclusively common carp ( Cyprinus carpio carpio) in the St. Lawrence River, Québec, Canada, during summer of 2001 was investigated by use laboratory diagnostic methods and an attempt to experimentally induce disease. The ultimate causes mortality were opportunistic bacterial infections with Aeromonas hydrophila Flavobacterium sp. secondary immunosuppression induced physiologic (i.e., spawning) environmental high temperatures low water levels) stressors,...

Abstract Approximately 8 weeks after a chlorine insult associated with the city water supply, shortnose sturgeon, A cipenser brevirostrum (L.), from one group presented small (3–4 mm) irregular foci of cutaneous pallor that involved dorsocranial integument progressive ulceration nascent lesions. Various bacterial organisms were isolated lesions, but not internal viscera. Histologically, nuclei intralesional and perilesional epidermal cells often exhibited margination chromatin resulted in...

Bacterial infection and antimicrobial resistance are important constraints in the production sustainability of farmed salmonids. This retrospective study aimed to describe frequency bacterial isolates profiles salmonid aquaculture Atlantic Canada. susceptibility testing (AST) results assessed by disk diffusion were summarized for 18,776 salmon (Salmo salar) rainbow trout (Oncorhynchus mykiss) samples from 2291 unique cases submitted Veterinary College, Aquatic Diagnostic Services...

DAO Diseases of Aquatic Organisms Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 44:7-16 (2001) - doi:10.3354/dao044007 Pathology associated with an aquareovirus in captive juvenile Atlantic halibut Hippoglossus hippoglossus and experimental treatment strategy for a concurrent bacterial infection R. Roland Cusack1,*, David B. Groman2, Anne-Margaret MacKinnon3, Frederick S. Kibenge2, Dorota...

Viral nervous necrosis (viral encephalopathy and retinopathy) is caused by piscine nodavirus ( Nodaviridae, Betanodavirus). Since 1986, this highly infectious virus has mass mortalities of up to 100% in farmed saltwater freshwater fish around the world (with exception South America Antarctica), affecting >60 species across 10 orders. The Atlantic blue marlin Makaira nigricans Lacépède, 1802) a top-level predator found throughout tropical waters Indo-Pacific oceans. Despite their...

The present study examined factors affecting horizontal transmission of infectious salmon anemia virus (ISAV) among naive Atlantic Salmo salar maintained in freshwater. ratio injected to cohabitants was varied and mortality monitored. Whether ISAV freshwater required contact also examined. Pathognomonic histological lesions fish infected by injection or cohabitation were compared. In trial 1, duplicate tanks containing 0 + 25, 2 23, 4 21, 6 19, 8 17 (injected naive, respectively)...

This case report provides pathologic and confirmatory diagnostic documentation of the first reported clinical epizootic infectious pancreatic necrosis (IPN) in farmed rainbow trout Oncorhynchus mykiss from central Mexico. Both gross microscopic pathology were consistent with IPN. A virus was isolated cell culture cytopathic effect typical IPN (IPNV). Positive identification as IPNV achieved by means an IPNV-specific indirect fluorescent antibody test reverse transcription-polymerase chain...

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 mass measured before refeeding after 3, 6, 9 12 weeks of ad libitum feeding. Total increase during the first 3 feeding greatest fish with higher initial factor. The reverse situation observed last Specific rate peaked period from week 4 except cod highest for which steady decline...