Jeff Woodhouse
Moaning Marlow Meldrew
Quite easy using the castrating camel method of two bricks. Easy to make a mistake though and squash the poor little critter, but a few million attempts should get it right.I believe one or possibly more of the Scandanavian countries had some success by trapping crays,neutering the big males
You can trap them BUT the trap has to conform to certain sizes, mainly to stop otters and voles getting in, and they MUST be registered when you apply for a licence. Costs nothing though and you get a tag to put on all your traps.
The EA are testing a powder to kill off the zebra mussels, but I hope it doesn't harm the native swan mussels.
EDIT bit : you can also try getting a tin of cat food and tying some string around it long enough to throw in the water and tie it to the bank. Punch holes around the tin for the flavours leach out, that attracts them whilst you get on with fishing. Mind you, all the fish will be around the tin as well.
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