289 Silurus glanis Linnaeus, 1758 Siluridae Sheatfishes Siluriformes Teleostei Wels catfish Europe and Asia. North, Baltic, Black, Caspian and Aral Sea basins, as far north as southern Sweden and Finland; Aegean Sea basin in Maritza and from Struma to Sperchios drainages; Turkey. Absent from the rest of Mediterranean basin. Now widely introduced and translocated throught Europe and Lake Balkhash basin in Kazakhstan. Several countries report adverse ecological impact after introduction. Silurus glanis Silurus glanis Silurus glanis Silurus glanis AMNH 175 Silurus glanis AMNH 18758 Silurus glanis IGFA 41 N 0 E Silurus glanis IGFA 46 N 61 E Silurus glanis P 99072.0311 40 N 31 E Silurus glanis P 91088.0001 Silurus glanis P 91029.0002 Silurus glanis P 91018.0047 Silurus glanis P 91018.0046 Silurus glanis ZMH 11940 Silurus glanis ZMH 11941 Silurus glanis ZMH 11942 Silurus glanis ZMH 6407 Silurus glanis ZMH 6408 Silurus glanis FISH 2078483 53 N 14 E 925 Silurus glanis ZMH 3751 1959 Silurus glanis ZMH 4176 1968 Silurus glanis AMNH 36490 1970 Silurus glanis 1982 Silurus glanis 1.3 m 1995 Silurus glanis 0.9 m 1996 Silurus glanis 0.5 m 1997 Silurus glanis 0.7 m 1997 Silurus glanis 0.7 m 1998 Silurus glanis 11 m 1998 Silurus glanis -0.9 m 1999 Silurus glanis 0.5 m 1999 Silurus glanis 0.6 m 1999 Silurus glanis -0.9 m 2000 Silurus glanis -0.9 m 2000 Silurus glanis 0.4 m 2001 Silurus glanis 0.8 m 2001 Silurus glanis 0.8 m 2001 Silurus glanis 0.6 m 2002 Silurus glanis 0.7 m 2002 Silurus glanis 0.45 m 2002 Silurus glanis 0.5 m 2003 Silurus glanis 0.6 m 2003 Silurus glanis 0.7 m 2003 Silurus glanis 1 m 2003 Silurus glanis 0.8 m