Catch fly technology and operating points

The remarkable reproductive capacity and high nutritional value of flies make them an endless and valuable source of protein feed for the breeding industry, as well as for the development of medicines, health care products, biochemicals, pesticides, and other chemical materials. It has been found that dried fly maggot powder contains between 59% to 65% crude protein, 12% fat, and 43.83% total amino acids—three times higher than that of fishmeal. Here is an introduction to the fly cage technology: Breeding in a fly house requires a steady supply of fresh indoor air, with temperatures maintained between 24°C and 30°C, and humidity levels between 50% and 70%. The lighting should be on for more than 10 hours daily to support optimal breeding conditions. Fly cages are typically square, measuring 50 cm in height, width, and depth. They are constructed from coarse iron wire or bamboo wood, and the outer cover is made of plastic gauze. One side of the cage features a circular opening with a 20 cm diameter, while the entrance is sealed with a 30 cm cylindrical tube, which is usually tied shut. Each cage can hold between 1,000 to 15,000 breeding flies. The first batch of sterile flies can be obtained from a demonstration base or cultivated from wild flies. Breeding methods may involve raising cockroaches or sterilizing them after collection. Large, healthy flies (not those that are overly full or weak) are selected and placed into the cage to produce sterile fly species. The main purpose of raising these cages is to encourage female flies to lay eggs in one concentrated area. Four types of devices are placed inside the cage: 1. **Water dish**: Specifically for drinking water, changed daily. 2. **Food dish**: Made from aseptic mash, brown sugar, yeast, preservatives, and water, also replaced daily. 3. **Egg-laying cylinder**: Filled with a mixture of bran and attractants, used to lure females to lay eggs. The material is replaced each day after transferring eggs to the larval rearing box. 4. **Feather cylinder**: Used to house newly emerged flies before they are ready for use. Once the flies have completed their life cycle, they are eliminated, and an all-in-all-out breeding method is implemented. All 20-day-old flies are killed and processed. After thorough disinfection, the cages are reused for the next batch. The temperature in the rearing house is kept between 26°C and 35°C, with humidity at 65% to 70%. The facility is equipped with breeding racks, bowls, thermometers, hygrometers, and heating systems. Fly larvae do not require light and are sensitive to it, so darkness is preferred during their growth phase. For breeding, pots are filled with 5–8 cm thick food mixtures primarily consisting of livestock manure, with a moisture content of 65% to 75%. One gram of fly eggs is added per kilogram of food. After 12 hours, the eggs hatch into larvae. For every kilogram of pig manure, about 0.5 kg of eggs are used. After five days of pupation and maturation, the pupae are collected and used. This is done using either the "strong light screening method" or the "anoxic method" to force the pupae out of the food. Once fed, any excess can be mixed with fish meal, dried, and processed into a flour-like substance. After culturing, the pupae are separated using a sieve and can be stored in the refrigerator for up to 15 days.

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