Keeper-reviewed care
Blue Bottle Fly
Practical guidance from raising and shipping arthropods in Canada.
Arthropods Canada · feeder care
Get more from every fly feeder order.
A practical guide for blue-bottle larvae and housefly pupae—from opening the parcel to safe emergence, feeding and cleanup.
Blue-bottle fly
Calliphora vicinaUse larvae directly as feeders or allow part of the order to continue to pupae and adults. Cooler storage slows development; it does not stop it.
- On arrival: inspect for excess moisture, odour or mold. Keep the shipped medium and larvae together unless the product label says otherwise.
- To slow them: refrigerate as directed on the product label, never freeze, and keep away from the coldest back wall. Check daily because household refrigerators and larval maturity vary.
- To use now: remove only the portion needed with dedicated tweezers or a spoon. Let chilled larvae warm briefly in a secure cup before feeding so the animal can detect their movement.
- To hatch flies: move a portion to a ventilated, escape-resistant container at room temperature. Provide dry material where wandering larvae can pupate; do not leave them waterlogged.
Housefly
Musca domesticaPupae are the inactive brown capsule stage and need no food. Their job is ventilation, stable conditions and a container that is ready before the first adult appears.
- On arrival: place the pupae in a shallow, dry layer inside the emergence container. Do not submerge or mist the pupae directly.
- For emergence: keep at normal room temperature with airflow, away from direct sun, radiators and cold drafts. Adults commonly begin emerging within several days, but transit and temperature can shift the timing.
- To delay briefly: cooler holding can reduce emergence success, especially as time increases. Use the product label first; do not freeze and do not assume every pupa will restart on the same schedule.
- Before opening: move the entire emergence container into the animal enclosure or a second containment bin. Adult houseflies are quick.
Adult fly setup
Containment
Use fine mesh and a sleeve or small access port so the main opening stays closed. Put the culture away from kitchens and human food. Work over a bathtub, large tote or other easy-to-clean secondary container.
Food and water
For flies being held rather than fed immediately, offer dry sugar or a 1:1 sugar-and-powdered-milk mix. Supply water through a saturated wick, sponge or plastic scrubber so flies can drink without drowning. Replace soiled food and water promptly.
| Stage | Feed it? | Moisture | Best check |
|---|---|---|---|
| Blue-bottle larvae | Not usually for short feeder storage; follow the product label. | Avoid drying and waterlogging. | Daily for movement, heat, odour and pupation. |
| Housefly pupae | No. | Keep dry with airflow; do not mist directly. | Daily for darkening cases and first emergence. |
| Adult flies | Yes, if not used promptly. | Protected drinking surface; no open deep water. | Daily food, water, escapes and waste. |
Clean handling and disposal
Keep feeder tools separate
Use dedicated cups and utensils. Wash hands after handling. Do not place feeder containers or tools on surfaces used to prepare human food. Remove uneaten feeders and waste before they spoil.
Prevent release
Never release feeder insects outdoors. To dispose, securely contain the culture, freeze it until no life stages remain, then follow local household-waste rules. Clean and dry reusable containers before the next batch.
Troubleshooting
No adults have emerged yet
Give the culture stable room conditions and keep checking. Cooler temperatures slow development. Pupae from one shipment may not be the same age, so emergence can be spread out.
Condensation is collecting
Increase ventilation without creating an escape gap, move away from direct temperature swings, and replace soaked paper. Do not seal wet pupae in an airtight container.
The culture smells bad or has mold
Do not feed visibly contaminated material. Isolate it from other cultures, wash your hands and contact us with the order number and a clear photo before disposal if you need help assessing arrival condition.
Adults are escaping
Turn off nearby lights, close the room and use a bright window or lamp to draw flies to one area. Repair mesh or gaps before opening the culture again. A sleeve cage greatly reduces escape during routine access.
Why this advice
Development is temperature-dependent and variable. University and published rearing protocols consistently use ventilated containment, controlled temperatures, sugar and protected water for adults. Housefly-care guidance also warns that refrigeration can reduce emergence when it is prolonged. Sources: University of Nebraska–Lincoln hosted housefly care sheet, published Calliphora vicina culture methods, University of Windsor blowfly colony methods, and Health Canada fly containment guidance.
This guide is for feeder care, not for breeding flies on meat or diagnosing animal illness. Contact a veterinarian for concerns about your animal.