@Alma (now with my serious face on) - when we were kids,living near Lake Victoria,we'd sometimes play truant and go fishing. Hunting for worms was an unpleasant prelude to the afternoon's activities. Not sure if its the same now,but there were acres of marshland around the lake,mostly behind the papyrus. So with some methodical picking we could get so many worms such that,at the end of it all,whatever was left always outweighed the fish. Worms the length of a man's palm. Not sure if that is the type you seek. I recall the marsh was loamy sort of....almost like black cotton but not quite...

The problem with equality is that we desire that it be with those that have more than us rather that those that have less

@ alma
you can buy earthworms from JKUAT Enterprises Ltd - a company owned by Jomo Kenyatta University of Agriculture & Technology.
Tel. 067 52 420 or 0721 167 244
All the best