Very little if any difference.
In England most fishing(except Trout/Salmon) is catch and release.
Some of the fish have been caught so many times they have even been given names.
Mostly they have been caught on barbed hooks.
If a fish takes the hook in the gills or gullet snip the line and let it go,the hooks will rust or be disolved and most fish will survive, barbed or not.
I have caught and kept pike with treble barbed hooks inside their bellys that are almost completely disolved.
The fish were healthy and obviously no worse for wear.
Barbless DEFINATLY increases the chanch of a fish escaping,at least in my view.
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