andywg
Bored into leaving
I fully understand that andy as you can see form my earlier quote in this thread. I just think that speaking technically (probably just playing with semantics a bit here) it is a needless death
the need (given by DEFRA and those who have deemed it to be illegal) to destroy it is that it is a threat to british wildlife, the individual circumstances show that this animal will not be be a threat therefore the need for this individual is not there, therefore it is needless.
But neither you, or I, or DEFRA, can be sure this cray will pose no risk. How many of us really know Wolf? I have chatted to him quite a number of times, but certainly couldn't put my hand on my heart and be sure that he would never release this cray into the environment. All we know is what we are told through the internet.
If Wolfy had some link to a research institute or puyblic aquarium then it would be more likely to help his case, but as an amateur hobbyist you just can't know.
Because of that uncertainty, I claim there is a need to destroy this animal. Essentially your argument fails on one major point:
the individual circumstances show that this animal will not be be a threat
You simply cannot prove the above. You certainly cannot prove it beyond reasonable doubt, and I doubt DEFRA would want anything less than that sort of burden before considering an exception. The amount of work DEFRA would have to put into ensuring this one creature hadn't now become a risk would detract from their abilities to search for, and deal with, other alien creatures that pose risks.
We are just members of the public, like anyone else. Just because we write on the internet how much we care about the fish does not elevate our status or make us any more responsible than others.

/www.akwafoto.pl/nieryby/raki/procambarus_alleni2.jpg
and you wouldn't then have wasted your money!