This is mentioned in this the April edition of AO. It states that in a 300 m stretch of the Rosebud there were thousands. They have gained a stronghold in the S Sk river basin and comprise 30 - 40 % of the fish in their field collection samples. They can spawn 3 times a year too. There is a pic on page 32 of them at the Hanna CNR res. as well as a listing of water bodies they infest.
Unfortunately it looks like it may be too late to stop them. It also states they think they may have come from ceremonial releases believed to bring good karma. Bad karma for our fisheries!
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