The nets for aquariums are poor quality. In fishing they have tons of different material for nets that are suposed to be better for the fishes slime and such. For small fish in my live well I use a monofilament net and below is my catch net and it's made of rubber. There is little to no slime left on the net when I take the fish out which leaves me to believe it stays on the fish.
I just use a viewer - like the ones most LFS use to catch fish in. Then, I drain it down very slowly so there is basically no water in the container and I slide the fish into the tank.