ESPECIALLY when the fish are small it's impossible to sort out all of them. For instance regular BG mixed in with RES. Dang near impossible to sort out 100% when they are <2" or so.
^^^Heed this advice to the letter or suffer the consequences later on.^^^
I have a pond full of unwanted BG. In my defense I did attempt to hold my stocker RES in a cage until they sized up enough for positive ID.
Daughter's doberman went swimming a couple days after I caged them in my pond, dump trucked the cage, and a dozen or so of 50 fingerlings escaped.
Since then I've been soaking traps 24/7 from April to October removing every <9" BG that I catch, but it hasn't been sufficient to keep up with their prolific spawns.
I bought a fyke net last fall and will begin using that once the water warms above 60° later this spring. I'll never be fully rid of them unless I drain/nuke the pond,
which I currently have no intention of doing, so I will continue the trapping but on a larger scale.
That said, I have good numbers of >10" BG along with a good crop of >12" RES, both of which I attribute to a good feeding program along with the constant trapping.
I'm just having to work a lot harder than I'd like to maintain that situation.
