This is some sort of plant holder for ponds. I found it in the pond/fountain section at Home Depot. Can you see that I jammed rigid airline tubing through both the left and right top? That's so I could suspend it in a plastic tote.
This picture shows the rigid tubing.
Pretend that the cardboard box is a plastic tote. I couldn't find it when I was taking pictures. I would place all the berried shrimp in the black plantar. The babies would fall through the mesh to the main tote. When the shrimp dropped the berries, I would return them to the holding tank. I would remove the babies with a net and put them in their own container. Can you see how the rigid airline suspends it? Kindda like those baskets in a chest deep freezer.