A maggot is the larva of a fly (order Diptera); it is applied in particular to the larvae of Brachycera flies, such as houseflies, cheese flies, and blowflies, rather than larvae of the Nematocera, such as mosquitoes and crane flies.
"Maggot" is not a technical term and should not be taken as such; in many standard textbooks of entomology, it does not appear in the index at all. In many non-technical texts, the term is used for insect larvae in general. Other sources have coined their own definitions; for example: "The term applies to a grub when all trace of limbs has disappeared" and "Applied to the footless larvae of Diptera". Additionally, in Flies: The Natural History and Diversity of Diptera, the author claims maggots "are larvae of higher Brachycera (Cyclorrhapha)."
Maggot-like fly larvae are of significance in ecology and medicine; among other roles, various species are prominent in recycling carrion and garbage, attacking crops and foodstuffs, spreading microbial infections, and causing myiasis. Maggots are also particularly important in forensic entomology because their development can help determine the time of death, particularly maggots in the Calliphoridae family.
Anglers use maggots usually commercially supplied to catch non-predatory fish.
Maggots are the most popular bait for anglers in Europe. Anglers throw handfuls into the "swim" they are targeting, attracting the fish to the area. The anglers then use the largest or most attractive maggots on the hook, hoping to be irresistible to the fish. Commercial maggot breeders from the UK sell their maggots to tackle dealers throughout the E.U. and North America.
In North America, maggots have been used primarily as ice fishing bait; recently, however, anglers have started using them year-round. Artificial maggots for fishing, either in natural or fluorescent colors, have been developed and are used for trout, panfish, or salmon species.
Maggot therapy
Live maggots of certain species of flies have been used since antiquity for wound debridement.