Toddy,
The natives are not anywhere near as aggresive, also in many areas signals (but not all) carry crayfish pluage, which they dont have the same reaction to as our natives. Unfortunately our white claws are from the delicate end of the crayfish spectrum.
Where the two do exist trapping doesnt seem to have helped the natives although i think the argument about the larger males eating young is only part of the story and suspect there is something about the absence of chemical stimulii making more females produce more eggs... although im not 100%m about that bit.
The post code system can be found on the application form here but note that thios isnt licences to trap them just to keep them, but if you are in the area where you dont need a licence to keep them then you are much more likely to get a licence to trap them since there are usually no natives left
http://www.defra.gov.uk/corporate/regulat/forms/fish/cray2.pdf
The natives are not anywhere near as aggresive, also in many areas signals (but not all) carry crayfish pluage, which they dont have the same reaction to as our natives. Unfortunately our white claws are from the delicate end of the crayfish spectrum.
Where the two do exist trapping doesnt seem to have helped the natives although i think the argument about the larger males eating young is only part of the story and suspect there is something about the absence of chemical stimulii making more females produce more eggs... although im not 100%m about that bit.
The post code system can be found on the application form here but note that thios isnt licences to trap them just to keep them, but if you are in the area where you dont need a licence to keep them then you are much more likely to get a licence to trap them since there are usually no natives left
http://www.defra.gov.uk/corporate/regulat/forms/fish/cray2.pdf