Development of a novel histopathological gill scoring protocol for assessment of gill health during a longitudinal study in marine-farmed Atlantic salmon (Salmo salar)

摘要: Gill health and disease in farmed Atlantic salmon (Salmo salar) were studied at a marine site on the west coast of Ireland. Fish sampled regular basis during summer autumn 2009. A novel histopathological scoring system was devised to give semi-quantitative measure gill pathology. The index criteria for histopathology lamellar hyperplasia, fusion, circular anomalies (necrosis or sloughing) oedema, score from 0 3 being assigned each parameter. Ancillary criteria, such as hypertrophy, haemorrhage presence specific pathogens, 1. Environmental monitoring undertaken included zooplankton phytoplankton sampling, well temperature oxygen recordings site. Epitheliocystis frequently observed low levels but not associated with any significant Clinically pathology one occasion sampling period, coinciding occurrence Pelagia noctiluca, Muggiaea atlantica Solmaris corona. Throughout longitudinal study, provided an accurate effective means assessing health, demonstrating ability this practical tool be used future studies disease.