Hatching Green Bottle Casters
🪰 Green Bottle Fly Caster Care & Hatching Guide
Receiving your pot of green bottle fly casters (or any other fly species) marks the start of a simple but precise process. Proper storage and controlled hatching ensure a steady supply of clean, active feeders — without the chaos of a mass hatch.
❄️ Storage: Keeping Casters Dormant
When your casters arrive, place the pot in a cool environment, ideally a refrigerator.
This slows their development and prevents them from hatching all at once, allowing you to control your feeder supply.
Tip: Keep the lid sealed and avoid condensation build-up — excess moisture can cause premature hatching or mould.
🌡️ Hatching the Amount You Need
To hatch a controlled number of flies:
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Prepare a well‑ventilated tub or pot with a secure lid — a cleaned cricket box or fruit‑fly pot works perfectly.
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Remove twice the number of casters you intend to hatch (some may not pupate).
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Place them in the container at room temperature (20–25 °C).
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Wait 3–7 days, depending on caster age and ambient warmth.
Remember: Once hatched, flies must be removed promptly to prevent escape or overcrowding.
🧊 Handling Hatched Flies
When your flies emerge:
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Place the container in the fridge for several minutes.
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The cool temperature will make the flies docile and easy to handle.
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You can then remove them safely and feed directly to your mantis or other insectivores.
After feeding, simply repeat the process — take another small batch from the original pot and hatch again.
🪱 If You Receive Maggots Instead
If your shipment arrives as maggots (fly larvae), you can feed them immediately.
They are nutritious, easy to handle, and ideal for mantises that prefer ground‑moving prey.
Once finished, store the pot in the fridge to slow development.
Repeat as needed until the maggots naturally pupate into casters.
The Mantis Garden Keeper’s Note
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Casters = control. Refrigeration lets you hatch only what you need.
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Ventilation = success. Always ensure airflow to prevent condensation and rot.
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Cleanliness = longevity. Rinse and dry containers between batches to avoid bacterial build-up.
With this method, you’ll maintain a steady, reliable feeder cycle.