Detailed Explanation of Simple Outdoor Fly Maggot Breeding Technology
Although outdoor fly maggot breeding has lower yields than three-dimensional fly maggot breeding and is not as stable as three-dimensional fly maggot breeding, it has the advantages of low investment, quick results, no need for seed introduction, no need to feed the flies, and low cost, making it the choice of most farmers at present.
The suitable season for simple outdoor fly maggot breeding is generally from late April to mid-October each year.
Construction of the Simple Breeding House
The site is chosen far from living areas, with tree shade but some light, and in places with many wild flies. The area should be determined according to the required yield; based on production experience, the average yield is about 0.5 kg per square meter. The breeding house only needs to be able to keep out rain; a thatched hut, cement tile house, or bark house will all do. The surroundings of the house must be enclosed with 1 m high screen windows to prevent chickens, ducks, and other animals from entering. The breeding ponds should be simple cement ponds, each with an area of 1.5 sq m to 2 sq m, with the pond edge 20 cm high.
Preparation and Placement of Manure Material
Fresh pig manure (within 3 days of being passed by the pig) 70%, chicken manure (within one week) 30%; 100% fresh pig manure from slaughterhouses; pig manure 75%, tofu residue 25%; chicken manure 50%, pig manure 25%, tofu residue 25%. Mix the above manure materials, with a moisture content of 100%, pile the manure to a height of 20 cm, cover tightly with agricultural film, and it can be used after 24 hours to 48 hours. Since this is outdoor breeding, the manure material can also be used without fermentation and sent directly into the breeding ponds. Send the fermented manure material into the maggot house, and pile three strips in each pond, each strip 0.8 m long, 0.2 m wide, and 0.15 m high. The time for placing manure is from 4 pm to 5 pm every day.
Preparation and Placement of Egg-Collecting Material
Because this is outdoors, there are more choices for the egg-collecting material. Dead fish and other things can be placed directly on the manure pile, or it can be prepared according to the following formula: calculated per 100 kg of manure material: wheat bran 1 kg, fish meal 2 liang, peanut bran 3 liang, water 1.5 kg. After mixing evenly, it can be placed on the manure pile. After the egg-collecting material is placed, walking beside the maggot ponds is prohibited.
Daily Management
After the manure material is placed and the egg-collecting material is put on (for the first few days, dead fish or fish internal organs are best, to attract wild flies), in places with many wild flies, a large number of flies usually gather on the egg-collecting material to lay eggs within half an hour. At 9 pm, a small amount of egg-collecting material should be used to cover the fly egg masses with a thin layer, to improve the hatching rate and reduce damage from ants and other insects. The fly egg masses will all hatch by the next morning. After 36 hours to 48 hours, the fly maggots have already crawled the previously neatly piled manure into a very scattered state. After 72 hours, the fly maggots that grow first begin to crawl out of the manure pile and automatically separate into the maggot collection bucket. Generally, by the seventh day, the fly maggots in the manure material have all separated cleanly. Assume you have 14 maggot ponds in total; you should add manure to two ponds each day, and by the seventh day all are full. On the eighth day, shovel out the residual manure from the first day after the fly maggots have finished emerging, and put in new manure material again. Production cycles in this way.
At 10 am, collect the fly maggots from the maggot collection bucket, shovel out the residual manure from which the fly maggots have finished emerging, and shovel the manure from other ponds, which has been scattered by the crawling fly maggots and has piled up and blocked the pond edges, onto the middle of the manure pile, so as to avoid blockage and prevent the fly maggots from being unable to distinguish the route when separating.
Simple outdoor fly maggot breeding does not require feeding. However, in order to keep the flies around the maggot breeding house and unwilling to leave, new manure material and egg-collecting material must be placed every day. The flies' food mainly comes from the manure material and egg-collecting material.