Comparative analysis of invasive aquatic animal impact was performed on the basis of GISS (Generic Impact Scoring System). Species ranking according to their resultant ecologic and economic effect showed the maximum values for F. limosus and C. gibelio. Dreissena polymorpha was also characterized by a high invasive threat, while the score estimates for invasive fish species were relatively low. The analysis of the confidence level in expert conclusions for the tested species was carried out, and the species for which the results obtained were significantly different among experts were indicated.
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