if cooked correctly, that is just plunged into boiling water and then eaten, it may not. If over cooked and therefore turned to rubber it may.
This is why shellfish can so often cause food poisoning. If you eat shell fish that has been living of human waste, as with Mediterranean shell fish, food poisoning will result; or you have to overcook. All shell fish is really only at it best when alive and cooked very briefly, crays included. I love shell fish, but would never buy pre cooked shell fish, only alive and if from the sea, sourced from the West Coast of Scotland, one of the few un polluted sources left.
Pop them straight in boiling water for 30 seconds at the most and they are done, but the plague is not killed and can still be spread. Fortunately it is harmless to humans so eating them is no problem and you remove the "gut" before eating, which usually contains the "nasties". But completely guaranteeing that the plague virus is removed is unlikely, so putting them into a river, alive or dead, is just not worth it. Particularly putting them into a river presently unaffected. Although it seems that only a few rivers are left that are unaffected now, and those are like the Teme where the flow is (hopefully) too strong for signal crays.
