Abstract
Organic components in marine sediments were determined along a transect away from a salmon farm in western Norway. Dry weight, ash-free dry weight and total bacterial numbers gave a basic description of the sediments. Pristane, elemental sulphur and fatty acids resulting from organic enrichment from the farm were detected. The method used was solvent extraction of the sediments and subsequent silica gel fractionation into aliphatic and aromatic hydrocarbons and polar components. The polar components were subjected to methanolysis followed by gas chromatography (GC) of the resulting fatty-acid methyl esters. The hydrocarbon fractions were analysed by GC directly. Amounts and composition were found to depend mainly on the distance from the farm site. Principal component analysis was carried out on 20 representative fatty acids in fish farm sediments, clean sediments, feed and fish faeces. A multivariate correlation between the fatty acids and pristane indicated that these components may be used as chemical markers of disposal from an aquaculture site.
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