At Bass Pro (probably other places too), they sell fishing nets -- the big ones -- with small mesh, instead of the big mesh you usually see. If you can find one of these, it will pretty much last you the life of the Pacu, no matter how large he gets, so it's a good investment. I and my husband have moved 3 Pacu, from 12 inches to 24 inches, and I have to tell you, you're going to get wet. Each were adopted at different times. We moved our fish in a rubbermaid tub with an airstone and a power converter in the car. Also, the lid was duct-taped on, just in case. We had good luck in all three cases -- the Pacu are happy here at their new homes!