According to my knowledge, in fly fishing 'bloodworm' may refer to three different things: 1) Red midge larvae, 2) reddish coloured freshwater annelids (aquatic oligochaetes that are the freshwater analogs of terrestrial earthworms) including tubifex worms (sold as 'bloodworm' in frozen blocks to feed aquarium fish), and then 3) the well known marine bloodworm (a [...]