Fish hook 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). The fish hook or similar device has been made by man for many thousands of years. The world's oldest fish
Blue bottle fly pawpaw ("Asimina triloba"), dead horse arum ("Helicodiceros muscivorus"), goldenrod and some species of the carrot family. These insects like to fly in packs in order to detect possible food more efficiently. If one fly detects food, it will disperse a pheromone which will alert the others to the meal. Its larva, used as fishing bait, is called a maggot, while its pupa, also widely used for bait, is called a caster. This bluebottle fly can cause human or animal myiasis. Forensic scientists sometimes identify it in the course of their works, particularly in the case of an autopsy of a