How do I avoid Crayfish When fishing?

I’m fishing dobbs weir in about a week, I will probably do a bit of carp, coarse and pike fishing, however I have heard the crayfish there are terrible. Could someone tell me why they cause sucha problem, what they do and how to avoid it. Also I hear the chub are huge down there…
this will sound stupid but a bobber is a float right?

By: Smiler2100

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