Victor ...a friend of mine is the designated sticker for a tx he fishes weekly on Cherokee...
he takes a hypo needle with a 1/2 long needle (pull the plunger out and discard) and sticks it approximately 1/4 inch above the spot in the back of his throat where all the skin squeezes down to one spot in the center.Push the needle on the same plane as the length of the fish from nose to tail. He then puts the fish back in the water in a vertical position so he can see the air come out of the hypo body. the pressure of the water on the sides of the fish will push the air out of the bladder.. Pull the needle out and release .