Hey guys,
Couple non-fish species I was hoping I could get ID help on. I found the clam in a small backwater while netting minnows. It was about the largest of probably 20 that I caught. They were down in some muck near plant roots. It is just less than 1 cm long. The crawdad comes from a pond nearby that is filled with them. It is about 4-5 inches long and was the biggest one I have seen in the pond. There are very few predators in the pond so the population is booming. The one in the pic has a very hard shell but the smaller ones are softer. My questions on both:
1)What is it? Incorrect ID on crayfish or clams can cause problems in a pond environment so I want to get a good idea of what they are before I begin messing around with them in a pond enironment.

2)Harmful in a pond? I was thinking the clams might be good food for RES because of their size, is this true? They could just be juveniles of a larger species but I did not find any larger ones.
crawdad crawdad1
clam