Live bait hooks are the most common of all hooks. They consist of a short shank and 180 degree bend with a barbed point. Barbs are also on the shank to prevent the bait from slipping off. Live bait hooks come in sizes from small for ice fishing to extremely large for saltwater, and they are also produced from several types of metal. Colors such as red, black, bronze and many others are produced to accent the color of the live bait being used.
Treble hooks consist of three hooks that are attached at the shafts with points facing outwards, forming a triangle. These hooks are most often used on crank baits or trolling lures to ensure a good hook set. The three hooks allow for a better chance of hooking a fish no matter which direction the fish bites the lure from. They are also used in river fishing with spawn bags, as they keep the spawn intact.
Weedless hooks are mainly larger hooks that are used in bass fishing. They contain either stiff bristles between the shaft and point or a metal wire loop that is spring loaded to stay underneath the point. This is to allow the hook to pass through weeds and lily pads without getting snagged. They will allow you to access more areas that hold large bass, and reduce the amount of bait lost in the weeds.
Circle hooks are designed to not embed into the stomach of a fish if swallowed. They are shaped in a curved fashion that resembles a circle. The shank of the hook is almost nonexistent, since it is curved. The idea is that the hook can slide through the fish until it get to the mouth then the point catches on the jaw. This method makes the hook removal much easier and often keeps the fish alive for release. These hooks are mainly used in saltwater fishing, especially where lines are set and retrieved later. They will allow the fish to remain alive for longer, and reduce the amount of fish that are improperly hooked internally.