Usually these structures have 2 to 3 inches of sand sediment with decaying organic vegetable matter, on which the worms grow. Tubifex can be easily cultured on mass scale. They can also survive in waters with heavy concentration of organic substances, where most of the other organisms cannot survive. They can also absorb substances through their body walls. They usually inhabit the bottom sediments of lakes, rivers, and occasionally sewer lines and outlets.Commonly know as sludge worm or tubifex worm, Tubifex tubifex are found in the bottom of lakes, rivers, and occasionally sewer lines and outlets (Place where the ditch joins fresh water reservoir. Encystment may also function in the dispersal of the worm. tubifex can survive drought and food shortage. By forming a protective cyst and lowering its metabolic rate, T. They can also survive in areas heavily polluted with organic matter that almost no other species can endure. The worms can survive with little oxygen by waving hemoglobin-rich tail ends to exploit all available oxygen, and can exchange carbon dioxide and oxygen through their thin skins, in a manner similar to frogs. Micro-plastic ingestion by Tubifex worms acts as a significant risk for trophic transfer and biomagnification of microplastics up the aquatic food chain. These worms ingest sediments, selectively digest bacteria, and absorb molecules through their body walls.
Tubifex probably includes several species, but distinguishing between them is difficult because the reproductive organs, commonly used in species identification, are resorbed after mating, and because the external characteristics of the worm vary with changes in salinity. Tubifex tubifex, also called the sludge worm or sewage worm, is a species of tubificid segmented worm which inhabits the sediments of lakes and rivers on several continents. Tubifex, in Aa River (north of France) in a polluted zone, circa 1990
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