Just as dark-coloured dead maggots catch a better stamp of roach than white maggots, so casters will catch bigger fish too. Ask your local tackle shop for freshly turned casters, as these will sink well, and their dark red colour makes them ideal for roach. Casters have a couple of advantages over maggots. First, the hook can be completely buried in a caster, ideal for fishing in clear water for wary roach. Casters also stay put on the bottom and won’t bury under stones or weed. Hemp and caster is a classic combination and my go-to roach bait for river trotting.