For bait I have found that ragworm and lugworm work best.
From the thisisbristol.co.uk
The squiggle of wet sand that resembles spaghetti is lugworm.
From the thisisbristol.co.uk
A study by government scientists has found that ivermectin, which has been licensed to 15 salmon farms in the western Highlands, is lethal to polychaete worms such as the lugworm.