Worms - I am breeding my own in a large purpose built wormery. I only put about 20 in there and there appear to be hundreds now, they are well fed and looking very healthy. I fetch brandlings, the stripey smelly ones" from the bottom edges of a dung heap (horse manure) and there are some of those in the wormery too but they seem to prefer the areas with matted soggy grass clippings towards the bottom. When I go out I keep the brandlings separate, but for both, I use a mixture of fresh compost, not too dry or wet, so that as they come out they come out clean. I tend to prefer the slightly smaller worms, and historically have had more success with about 2 " of tail end, but like most things one has to experiment and adapt according to what your after. The brandlings seem to get the best response, especially on canals where you want to go after larger chub or carp, not tried them on rivers though.