 Sizes, designs, shapes, and materials are all variable depending on the intended purpose of the fish hook.Fish hooks are manufactured for a range of purposes from general fishing to extremely limited and specialized applications.Fish hooks are designed to hold various types of artificial, processed, dead or live baits (bait fishing); to act as the foundation for artificial representations of fish prey (fly fishing); or to be attached to or integrated into other devices that represent fish prey (lure fishing).