A combination of starvation period,But when I did feed live, I'd drop in a fish, then drop in krill, repeat. The last 2 months or so I went 20+ days before live. Mind you everyday I'm dropping in prepared food for my gar, so hes been seeing him eat prepared for a long time. I was letting krill in the tank via the fish net he saw the live coming out of, because anytime he saw the net, he would get squirrelly so he knew it meant food
I tried the fishing line thing, it worked the first time I dangled it and he spit it out immediately, I continued that method for a few months. Hes not stupid that's for sure. I feel like if you can get your fish to continue eating prep after that your lucky. It was good for 1 bite for me. I switched things up weekly but ultimately it was the starvation periods and the gar eating infront of him