The best fishing knife will be extremely durable, and most knives are. There should be no doubt that even with a light gauge blade, durability is a guarantee. The flexibility that most fishing knives have in their blade design ensures that they can withstand massive amounts of force when being used. However, keep in mind that you can test your blade before you put it up to a task. When a knife is within its limit, the blade will easily bend to a point. When it is close to reaching its limit and risking damage to the knife, the blade will bend less with each added amount of extra pressure. When your blade’s flexibility seems less responsive, it means that you should ease up on the pressure because the blade is reaching its maximum limit. It is extremely dangerous to overbend any blade as it can cause the metal to snap and send a shard flying in an unexpected direction.