Gorgeous detail in your photos, I especially enjoy the look into the rotifer.
As I have not often worked with immersion objectives and can't imagine that one would be able to chase moving critters with xy-stage movement when the objective is immerged:
Was this rotifer dead or otherwise immobilized when you photograped it?
--Betty
Atticus Finch: "You never really understand a person until you consider things from his point of view
- until you climb into his skin and walk around in it."
Lee, N. H. 1960. To Kill a Mockingbird. J. B. Lippincott, New York.