Then I would wonder..are all copepods created equal? Perhaps the ones in the inland waterways and the ocean would have the same gut content, but ones from strictly fw habitats might have something else. So would they both have the same value nutritionally? Cool I guess if you can collect food for your fish. They might even be healthier than the aquacultured ones. Or on the other hand, could you introduce a pathogen that your fish cannot handle this way? I'm pretty sure even copepods can carry parasites. Just some things to think about...