First at all, thank you very much for your reply.:-)
As a good beginner I still dont know when and how use parent tree (manual is not clear for me), but I tried do something. I choose the fish and went to Figure>Set Figure Parent: everything have - before, except cameras/lights. I clicked on Universe but dont changed nothing (maybe is not the right way to do it). I did the same for my mermaid.
Anyway, I think I found what I am doing wrong: I was trying move only one figure trought trackball (as I do on Bryce5 to move objects) and then everything go together on scene. But, when using dials it works.:-))
I am really convinced that I cannot apply on Poser 5 what I do on Bryce, at least trackball have another concept behind it.
Thank a lot! As I said, still beginner, but everybody were too once.:-)
best regards,
aniela