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Casters are the pupae of the Bluebottle, the skin of the maggot goes hard and forms a shell. As the age of the caster increases, so does the colour, from light beige to an orange to a reddish brown, and finally to a dark brown. Casters are best used up to and including the reddish brown stage, after that they become "floaters", although in the right circumstances even these can be useful. For example, to catch rudd off the surface, but beware, the wind will carry your free offerings away, and the fish with them. Casters are a particular favourite of the tench, but is also particularly good at sorting out the better roach too. Hooking - Use a small enough hook to be buried inside the shell of the caster, and push the point of the hook out through the side, so the point is not masked at all.
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