1. Spirillum bacteria from highly polluted water -- 2. Sphaerotilus bacteria forming long chains from putrid water -- 3. Wasserbluthe (Microcystis), blooming in stagnant water -- 4. Chlamydomonas, one-celled alga in euthrophic water -- 5. Sirogyra, filamentous alga in nutrient-rich water -- 6. Cladophora, green alga from moderately polluted water -- 7. Rotifers, small animals from clear water -- 8. Carcgesium, ciliate from moderately polluted water -- 9. Diatoms, mixed algae from scarcely polluted water -- 10. Water hyacinth, plant from barely polluted water, rhizome |
