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from the Minho/Miño (Portugal, Spain) to the Kara drainages (Kara Sea, western Siberia). Within this range the species is present in Portugal, Spain, France, Germany (reintroduced), Denmark, Iceland, United Kingdom, Ireland, and in northernmost rivers of Scandinavia and northern Russia. Landlocked populations are known from southern Finland, Lakes Vänern (Sweden), Ladoga, Onega, and from some small lakes in the Vyg and Kem drainages, White Sea basin (Russia) Extirpated from Belgium, Czechia, Germany (now being reintroduced), the Netherlands, Poland, Slovakia, and Switzerland. Populations from the Duero, Tagus and Guadiana rivers in the Iberian Peninsula (based on historical records) are now extirpated, and populations have been lost or are threatened with loss from numerous rivers in Denmark, Sweden, Norway, and the other Baltic Sea countries, Ireland, France, United Kingdom, and Russia (the Lavna, Niva, Teriberka, Voronya, and Kalga rivers) (NASCO 2019). |
