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Table 1 Arithmetic means and standard deviations for biometric parameters

From: Contaminant levels in the European eel (Anguilla anguilla) in North Rhine-Westphalian rivers

Sampling site n Age (years) Length (cm) Weight (g) Lipid content (%) Condition factor
Rhein Bonn 9 9.5 ± 2.8 59 ± 12 407 ± 230 22.9 ± 9.7 0.18 ± 0.02
Rhein Düsseldorf 11 7.1 ± 1.8 47 ± 13 250 ± 169 13.9 ± 8.8 0.22 ± 0.08
Rhein Rees 9 8.7 ± 2.1 62 ± 10 529 ± 245 22.7 ± 5.8 0.20 ± 0.02
Rhein Emmerich 11 n.d.a 60 ± 10 405 ± 194 26.7 ± 11.2 0.18 ± 0.02
Sieg 10 8.6 ± 2.4 47 ± 7 203 ± 92 13.8 ± 8.0 0.19 ± 0.03
Wupper 10 7.6 ± 2.8 49 ± 11 278 ± 165 18.9 ± 8.8 0.21 ± 0.03
Ruhr 9 13.0 ± 4.0 56 ± 12 632 ± 604 26.5 ± 14.1 0.28 ± 0.17
Erft 10 8.8 ± 3.2 47 ± 8 230 ± 127 23.4 ± 12.6 0.20 ± 0.03
Lippe 9 8.3 ± 2.8 52 ± 10 280 ± 171 21.6 ± 11.8 0.17 ± 0.03
Niers 5 14.0 ± 4.6 734 ± 14 861 ± 395 29.1 ± 6.3 0.20 ± 0.02
Schwalm 8 13.4 ± 2.1 67 ± 8 597 ± 194 20.8 ± 7.8 0.20 ± 0.03
Rur 10 12.2 ± 2.3 55 ± 6 316 ± 116 25.4 ± 9.6 0.19 ± 0.04
Berkel 8 9.0 ± 4.3 54 ± 13 375 ± 252 20.6 ± 13.4 0.19 ± 0.03
  1. an.d. =not determined.