Question 1

How often should I start a new fruit fly culture?

Accepted Answer

Start a fresh culture every 1–2 weeks so a new one is always booming before the old one crashes. Melanogaster cultures are usually harvestable around 2 weeks and spent by 4–5 weeks; hydei are slower (harvestable ~3 weeks, spent ~7–8 weeks). Staggering cultures a week or two apart is the whole trick to never running out.

Question 2

How long does a fruit fly culture last?

Accepted Answer

At room temperature (~72–78°F), a melanogaster culture typically produces for about 2–4 weeks and should be retired around 4–5 weeks, while a larger hydei culture produces longer and is retired around 7–8 weeks. Warmth speeds this up and cold slows it down, so treat the dates as a guide and watch your actual cultures.

Question 3

Why did my fruit fly culture crash / stop producing?

Accepted Answer

Cultures naturally boom and then crash as the food runs out and waste builds up — that is normal and why you stagger new ones. Early crashes are usually from mites (keep new cultures away from old ones), the culture being too cold, or contamination. Retire and compost spent cultures promptly, and always keep a fresh one coming online.

Question 4

How many feeder cultures should I keep going at once?

Accepted Answer

For a small-frog collection, aim for at least two producing fruit-fly cultures at all times, started a week or two apart, plus an ongoing springtail culture (and dwarf isopods if you keep a bioactive vivarium). The tracker flags when you have a gap coming so you can start the next culture in time.

Feeder-Culture Tracker

Keep the frogs fed