Tubifex is a cosmopolitan genus of tubificid annelids that inhabit the sediments of lakes, rivers and occasionally sewer lines. At least 13 species of Tubifex have been identified, with the exact number not certain, as the species are not easily distinguishable from each other.
Read more about Tubifex: Food and Feeding, Reproduction, Copulation and Cocoon Formation, Culturing Tubifex, Live Food, Tubifex Species