Here is one site with lots of fish/minnows pics. with descriptions. But it is not easy to tell sometimes. If you think iding lepomis is tough then look at the minnows.

http://www.cnr.vt.edu/efish/index.html

Robinson it is the control of the stocking decisions by others that is the problem not necessarily the quality of the state fish. I have found that state providers ,often due to the demands on their time and resources , are pushed to the limits and don't have the time to put in on each pond with its unique factors. They tend to stick to cookie cutter plans . Often the fish may be stocked sooner and smaller than you or I would do. All of that said they are still an ok source IF you can control the decision making process and you know who grew the fish. Some states don't have hatcheries and parcel it out to a number of growers who may or may not provide what was contracted for.