One thing that I've seen missing from the hobbyist side of this discussion is acknowledgement that there have been release of a native, but translocated, shrimp into the wild in WA, coincidently in mid 2013, not long before the raids started.
http://www.fish.wa.gov.au/Documents/biosecurity/freshwater_pest_fact_sheet_indistinct_river_shrimp.pdf
Whilst I don't point fingers at our hobby because 99.999999% of the people in this hobby know better than to release shrimp or any other organism for that matter (either unintentionally or intentionally), I cant think of any other industry that would have been a more likely conduit for the transfer C. indistintca to WA. Please feel free to disagree and suggest other possible avenues, but its pointless arguing anyway because the damage is done. Regardless of whether the hobby is responsible or not, we are the obvious target. Moreover this probably explains why this has been limited to WA (so far).
I feel for the shrimp keepers in WA who have done the right thing and now have to pay for someones screw-up. Hang tough guys and gals.
However for us in the east, let this be a reminder that we must:
NEVER RELEASE INHABITANTS FROM AQUARIA INTO THE WILD, EVEN IF THEY ARE NATIVE.
This includes ensuring things cant escape from your ponds outside, an entry way for exotic organisms that often isn't given much thought.