The distribution of A. anguilla mtDNA cyt b haplogroups in Europe and North Africa: the eel samples collected during the earlier studies (Aoyama and Tsukamoto, 1997; Wolf et al., 2000; Aoyama et al., 2001; Daemen et al., 2001; Lin et al., 2001; Minegishi et al., 2005; Jacobsen et al., 2014) and data from GenBank (EF427617–EF427618, EU223996–EU223997, EU492326–EU492327) are indicated in squares, whereas the eel samples collected during the current work are indicated in circles; the diameter of pie charts is proportional to the number of sequences (1–52 sequences); eel samples: AR − the Arno River; BAL − Lake Balsys; BC − the Bristol Bay; BJ − the Baltic Sea; BR − the Burrishoole River; BRA − Lake of Bracciano; BU − Burrishoole; BUR − Burano; DRI − Lake Dringis; EFR − Eastern France; FR − the Coast of France; KM − the Curonian Lagoon; LE − Lough Erne; LGL − Lac Grand Lieu; MO − Moulouya; RH − Ringhals; RĮ − the Gulf of Riga; RM − Rio Minho; SE − the Estuary of Severn; SIE − Lake Siesartis; SP − the Coast of Spain; SR − the Sebou River; SW − the Coast of Sweden; SWZ − Switzerland; TUN − the Coast of Tunisia; UK − the Coast of England; VA − Valencia; VIS − the Viskan River.