The extent of heavy metal pollution in Trondheimsfjorden was investigated throughout the period 1972-73. Samples of invertebrates and seaweeds from the intertidal zone were collected for analysis, and parts of some pelagic and bottom-dwelling fishes were also sampled. Seabirds were collected in the fjord and from adjacent areas. Subsamples from the kidneys, liver, pectoral musculature and eggs (white and yolk) of these birds were analysed. All samples were analysed for cadmium, copper, iron, nickel, chromium, silver, zinc and mercury.
Heavy metal pollution was found in two distinct areas of the fjord. The qualitative and quantitative changes in the faunal assemblages of these two areas are described.