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...

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...

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...

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..

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...

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 sea cages from hatcheries where the disease existed, fish showed erratic and abnorm...

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...

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 ...