With an ac pump that system would work. With a DC pump, you should be able to wire the solar panel directly to the pump. The pump runs when the sun is out.
I remember seeing a Geoff Lawton video where he uses this setup to aerate a small part of a pond that can be blocked off. He occasionally would feed them in there too. Harvesting was easy with a net once the fish were trapped.
I don't have any recommendations, I'm looking to get some solar this year too.