Things never quite work the way you intend. Let's start with the arrow. He's still swimming, still fragmented at the jaw tip, and it looks like he's starting a small tuft of fungus in the erupted tissue. I've already treated the water for it, and I'm dosing melafix again as it seems to sooth him.
On the day I was supposed to work on him, my roomate's mother, my own mother both wound up in hospitals. Mine's still in critical care on oxygen. I just got back from a trip to the emergency room myself for similar problem. Just one of those chest colds that get out of hand. I turned grey and collapsed at work. So I did'nt get to work on him as I'd intended.
His jaw is still fragmented, but it looks like one of the fragments is almost back in place. It does not need to be set, and he worked it a little when I came up to the tank. He's not taking food, but it's not due to a mechanical failure on the part of his jaw. I'm thinking it's becaus his mouth still hurts, and he's still stressed. After reading the further replies, I think I'll try to let him heal on his own, and if he's deformed, it'll be ok if he''s comfortable and eating again. I was most concerned about him rubbing or hitting the break and causing it to split his jaw the long way, and I don't think that's as likely now.
In answer to some of the questions posted, I was going to set a box net under his swimming level and moving him over it to trap him. After I had him confined to the box net, I'd lift him out with one hand under his head controlling it, and one at the pivot point of his body just past the midline. That's how they did it in the video I saw of harvesting arrow fry from an adult male. Control the fish without hurting it.
I have had some medical training and some experience in emergency procedure. I've set bone, stopped a lung from collapsing with plastic wrap and even pulled one guy off a steering wheel when his car crash caught fire. No, I'm not an EMS or first responder, I'm just always in the wrong place at the wrong time. I also did quite a bit of biology in school including some animal surgery. I get a lot of my confidence in sedating a large fish from my mother, a practicing anestist of 40 years. (she had no idea what to do for a fish, but the basics still apply, level of anestisia, keeping resperation up, etc)
I hope he recovers. I'm certainly going to give him as much support as I can. I'm still not going to try getting a picture of his injury yet, as he's very shy at the best of times, but I'll put in a shot I got of him in his heyday. His name is Gehena. He's my arrow.
OSH