Anyway, suctorians anchor themselves to floc much like a stalk cilaite. "Spikes" extend from the organism into the water instead of the cilia seen on stalk ciliates. Suctorian feeding makes them one of the most interesting wastewater protozoa. Say a free swimming ciliate or flagellate happens to come into contact with the suctorian's spikes. It is immediately immobilized by the spike and the ciliates cytoplasm is consumed by the suctorian. If you see this happening under the microscope, it makes excellent video.
So what does having suctorians present in wastewater mean for biomass health?
- Sufficient D.O.
- Floc is forming as needed in Activated Slduge
- Toxic substances or other shock loadings are not present
- Soluble BOD5 has decreased leading to a mature biomass in decline phase growth