Abstract

Samples of three species of deep-water demersal fishes, Nezumia aequalis, Lepidion eques and Raja fyllae were obtained from fish caught by bottom trawl at depths between 850 and 950 m on the continental slope of the Rockall Trough west of Scotland (58–59°30′N) in March 1998. Muscle, liver and gill tissues were analysed for cadmium, copper, lead, zinc, and mercury by various atomic absorption techniques. In N. aequalis, median concentrations were in muscle tissue 0.004, 0.21, 0.005, 0.150 and 3.91 mg/kg wet weight, respectively, in liver 0.292, 1.92, 0.048, 0.075 and 16.18 mg/kg wet weight, respectively, and in gills 0.045, 0.87, 0.093, 0.058 and 29.88 mg/kg wet weight, respectively. In L. eques, median concentrations were in muscle tissue 0.005, 0.17, 0.002, 0.077 and 2.62 mg/kg wet weight, respectively, in liver 0.268, 3.07, 0.033, 0.050 and 15.05 mg/kg wet weight, respectively, and in gills 0.040, 0.93, 0.039, 0.033 and 24.32 mg/kg wet weight, respectively. In R. fyllae, median concentrations were in muscle tissue 0.012, 0.33, 0.027, 0.129 and 5.53 mg/kg wet weight, respectively, for liver 0.509, 1.98, 0.026, 0.083 and 17.97 mg/kg wet weight, respectively, and in gills 0.094, 0.47, 0.012, 0.101 and 12.89 mg/kg wet weight, respectively. Nickel and chromium were not detectable in any of the samples analysed. In general, the concentrations are similar to those previously reported in other species from this area. Differences in accumulation patterns between species and elements are described using univariate and multivariate statistics (discriminant analysis).

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