If you are going to add creek chubs you will be better served to add golden shiners. Both species will be nuisance biters for small live bait users. Chubs will be more of a nuisance since their mouth gape is much larger than that for golden shiner. Larger creek chubs can eat a sizable item. Plus shiners will repopulate and chubs will not.
I would add crayfish and not rely on immigrants because the stocked, reproducting and colonized crays will make it harder for the more problematic invaders to become established although some invading crays are very competitive and can crowd out dense populations of the more beneficial ones such as less aggressive papershell crayfish (
Orconectes immunis). The crayfish species of water nymph crayfish (
Orconectes nais) and northern crayfish (
Orconectes virilis), both common pond species with less tendency to make chimney burrows, may be good ones to stock as forage. Another fairly large type species found in ponds is the White River Crayfish (
Procambarus acutus) which occurs along the east coast and in states of the main Mississpi Rv drainage. The White River cray will readily burrow and make a simple vertical chimney. These three species are a little larger than papershells and may be better competitors to some of the immigrant ditch burrowing crayfish belonging the genus
Cambarus or
Procambarus. Established ponds with good crayfish habitat and nearby streams have more than one species of crayfish in the pond due to immmigration.
IMPORTANT NOTE: when adding crayfish it is best to use one of the species native to your region - do your homework. Crayfish are good short distance overland travelers and migrators from adjacent streams and ponds. Any crayfish species not native to your locale is considered an invasive species and when established in your local surface waters can cause problems with the native crayfish species and the surrounding ecosystem. So when stocking crayfish choose the more beneficial ones that are already reported for your state.
Crayfish by State:
http://iz.carnegiemnh.org/crayfish/country_pages/species_by_state.htm
