Did some research earlier this morning since I didn't go fishing. Australia I do not believe has used the Koi Virus on the carp, yet. They have approved the 15 billion or so budget for it, but the bleeding hearts are at it now. One guys says his business will be destroyed and profits loss cause he sells carp as bait, oh well buddy get another line of work, sorry to inconvenience you. Others are saying the carp are a food source among the under privileged and ethnic groups in Australia, so who knows where it will end up. The virus was introduced a while back into ALL of Japans rivers and steams and so far they report no damage to other species other than carp.
And to attempt to answer your questions Lowe, that is one of the concerns, a mass die off will cause oxygen loss and kill other fish that way. My thoughts is you need to catch them early in the bigger flood lakes while numbers are relatively low, if they in fact have been introduced that is.

