Problem with new pond

Had my pond and waterfall put in last fall but...
The skimmer is too low in the water. The landscaper was so far behind in
his work that I said I would wait until spring if he would come back in
April.

Now he says he can't and I'll have to wait my turn. Whenever that might
be.. So I think I'm stuck. I certainly can't landscape around the skimmer
and am not sure whether I dare put fish now or not.

Can anyone tell me if I dare put fish in now? Will it hurt them if he
raises the skimmer with the fish in? Or I suppose I could take them out
temporarily. Got another pond down the hill where the fish live at present.

Pixi