when i was young and fishing a very small farm pond that was way overpopulated with everything and i gut hooked a bass that was decent size so i left the hook in and i managed to catch the same bass 3 times in 2 weeks after that and the hook was alwasy there and a few weeks later i cought him again and it was there but it had worked its way almost out so i took it the rest of the way out so i always say leave the hook in but then the other day in a tourny i left a hook in and the fish died in like 20 minutes so who knows