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The riverine location of haematotoxic discharges was determined by exposing adult captive Atlantic salmon (Salmo salar L.) to River Don water in situ. Experiments were conducted using a control group and 4 test groups at different distances downstream of a paper mill and field drain discharges. Significant changes in whole blood haemoglobin, plasma cholesterol and bilirubin in salmon from polluted sites indicated the induction of a marked bilirubinaemia in test fish. The most marked pathology occurred in salmon exposed at a site below all the major effluent inputs into the river and suggested additivekynergistic effects between discharges. Pathophysiological changes in captive test fish from the polluted area closely resembled those recorded in wild Don salmon suffering from a non-infectious hyperbilirubinaemia. The effluent cause of the pigmented salmon syndrome in wild Don salmon appeared to be located between the reference site and a point 14 km downstream in the River Don.

diseases of aquatic organisms

Tracing of haematotoxic agents in water with the aid of captive fish: a study with captive adult Atlantic salmon Salmo salar in the River Don, Aberdeenshire, Scotland