You can actually collect certain native species with a fishing license but that fish collected can not be on the endangered list. I personally can collect Rainbow Darter in my state with a fishing license.
I actually have a scientific collection permit through my work which pretty much gives us free rein in pa as long as its for work. This fish was actually caught micro fishing in Delaware though. There redfin pickerel can be fished with no size/closed season. For native fish in PA that cant be collected legally as long as you have documentation that it wasn't taken from PA waters and was harvested legally you can keep it in aquaria. In this case I have an in situ photo of the fish with a location stamp. This only applies to PA/DE always make sure you're familiar with your local laws of course
we have a good bit of biodiversity in pa, I work for parks and rec as a naturalist so i do a lot of stream monitoring and biodiversity studies, mostly in South Eastern PA. if you have a fishing license and legally catch the fish (follow all seasons and bag limits) you can keep it for your aquarium! unfortunately redfin pickerel are lumped together by the fish commission here with chain and grass pickerel which have a 18in size limit which pretty much renders them illegal to keep since they max out at about a foot
