- Fight time
- Injuries sustained to fish during fight/landing process
- Handling of fish while on land (excessive touching, flopping on shore/against rocks, etc)
- Time spent out of water (remember, fish have gills, not lungs and lack the ability to store oxygen. 10 seconds is all it takes for significant damage to occur)
- Water/atmosphere temperature/Oxygen content of water (will both be factors during the fight and recovery process)
- Other situation dependent factors
As you can see, fish have a lot going against them. Not only did crimping the barb on all my hooks make fishing more convenient, but it proved to be a timesaver on the water and gave me a bit more piece of mind knowing I've done all I can to release the catch as unharmed as possible. And it will make you a better fisherman, more adept at fighting and landing fish without the safety net of a barb.
Because I tie all of my own flies, it's easy to prepare each hook properly. I crimp the barb on each hook with a set of pliers before I begin tying. If you purchase flies, it's a bit harder to stay on top of it. Take note before tying one on. If catch and release is your thing, go barbless for a more fruitful fishing experience.