Beings these are listed on USFWS site, obviously this is a Federal issue and may or may not be a state issue but federal Regs say it is illegal to "knowingly trap, possess, transport or otherwise alter habitat" of species listed on threatened or endangered lists as posted by current USFWS.
While I do agree, I'd like to play devil's advocate and just say, "what are the chances you'd get in trouble if you caught a few of these in a minnow trap and transported them to your pond?" Especially if they're mixed in with other species. Worst case scenario, you play dumb and say you didn't know they were endangered. Again, I do NOT recommend testing your luck... I just don't see you getting into trouble if you're careful. If they're threatened and/or endangered, I doubt you'd find any anyways.
