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Table 2 Comparison of mercury concentrations of fish: all fish (aged < 10 years) vs. fish in the age-window recommended for monitoring (3–4 years, for roach 3–5 years; [7])

From: A field study in support of the monitoring of priority substances in German freshwater fish: derivation of fillet-to-whole fish conversion factors

Age < 10 yearsHg fillet (µg kg−1 ww)Hg whole fish (µg kg−1 ww)Age 3–4/5 yearsaHg fillet (µg kg−1 ww)Hg whole fish (µg kg−1 ww)
Chub (n = 42)74 ± 2854 ± 18Chub (n = 23)62 ± 2147 ± 12
Roach (n = 123)49 ± 4038 ± 30Roach (n = 80)45 ± 3236 ± 26
Bream (n = 38)30 ± 3024 ± 24Bream (n = 2)58/5b50/4b
Whitefish (n = 20)87 ± 2572 ± 19Whitefish (n = 13)81 ± 1468 ± 12
Perch (n = 117)72 ± 4054 ± 28Perch (n = 67)70 ± 3753 ± 26
All species (n = 340)60 ± 4046 ± 29All species (n = 185)58 ± 3446 ± 26
  1. Data are given as µg kg−1 ww for fillet and whole fish samples of fish species from all sites (Elbe fish with high mercury concentrations identified as outliers were removed)
  2. aRoach 3–5 years, other fish species 3–4 years
  3. bBream from Elbe River/Baltic Sea lagoon