Microbial and pathological findings in farmed Atlantic salmon Salmo salar with proliferative gill inflammation.

The article examines the microbiology and pathology of proliferative gill inflammation in farmed Atlantic salmon in Norway. Materials and methods used to store tissue samples and extract DNA and RNA are described. The epidemiology and histopathology of seawater-reared fish is discussed. An analysis of tissue samples has detected Candidatus Piscichlamydia salmonis in seawater-reared fish. Freshwater stage observations show no increased mortality or disease from the hatcheries. The histology of freshwater-reared smolts is discussed.