a catch and release cradle would work perfectly. carp, pike, and musky fisherman use them for their monster catches. i'm thinking about making one with some mesh and two pvc pipes. the last time i tried to catch an aro with a bag, the fish launched out of my tank and onto the couch. it was hilarious. i can play back in my head in slow motion over and over. only damage done was a few missing scales.
here's a link to the cradle: http://www.thornebros.com/muskie/releasetools/frabill/frabill_nets.html
here's a link to the cradle: http://www.thornebros.com/muskie/releasetools/frabill/frabill_nets.html