MJ haplotype network of 394 A. anguilla mtDNA cyt b sequences: mtDNA cyt b sequences of eels caught in other European locations, as well as their frequency, are marked in white; the numbers between the nodes indicate particular mutations (red − transitions; blue − transversions) between the most closely related sequences; the radius of the circles is proportional to the frequency of haplotypes; BJ − the Baltic Sea; KM − the Curonian Lagoon; RĮ − the Gulf of Riga; UK − the Coast of England; BAL − Lake Balsys; BRA − Lake of Bracciano; BUR − Burano; DRI − Lake Dringis; SIE − Lake Siesartis; TUN − the Coast of Tunisia; UNK − glass eels fixed in formaline in Moscow.