Treble Hook Advantages
With three hooks, chances are better of hooking a fish on a treble hook. Some trebles are even offset so the hook rotates when a fish bites in order to bury at least one more barb in the fish.
Treble Hook Disadvantages
When more than one hook buries in a fish, removing the hook can be difficult. Treble hooks have greater potential to harm fish than single hooks, which is especially undesirable when an under-sized fish is caught or when catch-and-release fishing.
Single Hook Advantages
Some claim a single hook penetrates better than a treble hook because it is thinner in diameter. Single hooks are also less noticeable to fish.
Single Hook Disadvantages
Hooking fish can be more difficult with single hooks, especially when live bait fishing when the bait covers the hook, making it more difficult to set the hook into a fish.
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