What part of the PAFBC site did you see that on? Can you post a link to it? I sure would like to see that those darters are doing well, too. Especially gilts. But when I checked the PAFBC sites list of endangered, threatened, and candidate species those guys are all still listed. Now, just how MUCH protection they receive, I don't know. Depending on the state, a species may be listed but still able to be collected. I don't know about PA.
Here's a link to the state's page that I have. Some of the sources are as recent as 2013, so I'm confident this list is pretty current.
http://www.pacode.co.../chap75toc.html
I'm curious to see where these darters stand, er, swim?, in regards to listing and the implication for home aquaria. If they are unlisted, then the whole question of why, and is it ethical pops up. Just as you hinted at.
Not trying to be a pain in the 'tocks. Just want to be sure we get things right. You obviously care, and are to be commended for that!