I have the best results by going out in the spring with a fine meshed net, netting through the weeds at the bank where there is lots of cover, grass etc. I usually get 8=10 young per scoop, of what ever species is prevelant in the lake or pond im at.
Immediately in clean aerated water in a medium sized cooler, and im on the way home with as many young as i care to take, very few or no losses.
I never try to keep adult fish, although some do with no problem, it just seems the younger fish take that stress better.