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In October 2007 an invasive alien species, the Chinese sleeper, Perccottus glenii Dybowski, 1877 (known also as the Amur sleeper), was recorded in carp ponds in Kraków-Mydlniki (southern part of Vistula River drainage). As far as we know, this is the uppermost site in the Polish part of the Vistula River drainage. Thirty-six individuals of P. glenii were collected during fishery works. Basic morphometric...
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