Bloodworms are the larval form of the genus Chironomus, part of the Chironomidae family commonly known as non-biting midges. They get their name from the blood red color of the larvae. This color is due to the abnormally high concentrations of hemoglobin in their bodies that allow them to live in bodies of water with an extremly low O2 content. By being able to survive in these types of enviroments the larvae can escape predation by species that can't handle the low O2 content. Bloodworms are filter feeders, and will feed off of suspended nutrients in the water column. They are not very particular about where these nutrients come from. Because of this ability to survive in areas with a low O2 content and their method of feeding on particles in the water column bloodworms thrive in shallow highly eutrophic bodies of water. Golf course ponds, run off dominated streams, and highly eutrophic lakes are some of their prefered habitats. Because of this they are some of the most abundant aquatic insects you'll encounter here in the metro. Last summer i did some work collecting specimens of chironomids from several lakes in the metro. Because they are such a diverse family, it is possible to use them as an indicator species for water quality in a body of water. By noting which genera are present and their relative abundance a fairly accurate picture of water quality for the past year can be formed. Unlike chemical testing which only gives you a brief snapshot on the day the tests are preformed, using this type of biotic index gives you a much broader view of the water quality picture.
As far as feeding them to your fish, frozen bloodworms are an excellent high protein food. You need to be carefull about feeding them to fish that are primarily herbivourus as they can cause digestrive tract problems. I feed them to my rams, angels, kribs etc. twice a week and they absolutely love them. My rams spawn about every week and a half when gettign bloodworms twice a week. (i tend to spoil my fish though, I would feed 3 times a day. Morning and evening were flake food, in the afternoon would be frozen brine shrimp with frozen bloodworms substituted every 3rd day.)
So ends another long rambling pointless post. I think i do this just to reassure myself that i've actually learned SOMETHING in exange for all these loans i will need to pay back
Will