During startup or after a shock loading, high F/M creates conditions favoring amoeba and flagellate protozoa. Amoeba can have great size variation but are easily distinguished by their unique - amoeboid - movement where pseudopodia stream out and engulf food. In this case, the amoeba is consuming free bacteria and small organic particles in the water. You can see the large number of vacuoles inside the amoeba containing digesting particles.
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