http://www.fws.gov/injuriouswildlife..._8-14-2012.pdf
Have a read of Section 3, pg 4 onwards of the above document to get an idea of the effects this fish can have on other fish species and the aquatic environment.
http://www.reabic.net/journals/bir/2...Elgin_etal.pdf
The above paper is based on studies and reportings of the species in Alberta between 2006 and 2014. Table 2 on page 279 documents how widespread the species is in Alberta.