Imoore, the clam looks like an Asian clam I actually just put about 100 of them I collected from the Potomac River into one pond I am managing. One of my goals for the pond is to grow large RES and RES love to eat small clams, so we will see how that works out. Plus the pond I am managing is very fertile, actually too fertile so I am hoping the clams will help combat this and turn some of the excess into RES food. Here is the discussion we had about clams as forage

I am not good with crayfish ID, however they do not look like rusty crayfish which are pretty distinct looking and they are the only species that is of a real concern that is found in the Midwest. The introduction of crayfish from a nearby pond probably won't cause any harm. However, someone with crayfish IDing skills can tell you the exact species so you know their habits and what to expect.