I think that targeting the shrimp keeping hobbyists is not only dumb, but counterproductive. I seriously doubt that they will find any caridins nt's in their waterways. Correct me if I am wrong but they are talking about east coast natives? Odds are that if someone in the aquarium hobby has australiensis shrimp in their tank, they caught it in the river, and if they released it, it would be into the bin, dead. I just can't see people smuggling them into WA.
I am not saying that it is just not possible I am trying to say that it is far more likely that "farmer brown" shipped in a load of 1000 or more to stock his dam with.