Originally Posted by
PEZenfuego
http:///forum/post/3029214
When I'm bagging corals I just hold the edges far apart and blow air right into the bag...I don't bend over or put my lips on the bag, I just stand up straight, look down, and blow a puff of air directly into the bag. Then I grab the whole thing ninja-like give it a few twists so that it is tight and full of air. It takes some practice but is very easy to do. Never have done this with fish.
When you do this; you're putting in used air---your lungs have absorbed most of the oxygen. Use the air pump mentioned by TeresaQ. Put in the water, twist the bag a few times (with the tubing in it), pump it up, remove the tubing, and secure the bag.
BTW, the can of computer "air" I have has about a dozen safety warnings, that says all I need not to use it with fish. Also, if you need to keep the fish bagged for some time, ask your lfs for some pure oxygen. (I have a nurse friend at the local hospital and have actually used ER oxygen; don't tell anyone!)