ショウジョウバエが幼虫として過ごす期間は？
The developmental period for "D. melanogaster" varies with temperature, as with many ectothermic species. The shortest development time (egg to adult), 7 days, is achieved at . Development times increase at higher temperatures (11 days at ) due to heat stress. Under ideal conditions, the development time at is 8.5 days, at it takes 19 days and at it takes over 50 days. Under crowded conditions, development time increases, while the emerging flies are smaller. Females lay some 400 eggs (embryos), about five at a time, into rotting fruit or other suitable material such as decaying mushrooms and sap fluxes. The eggs, which are about 0.5 mm long, hatch after 12–15 hours (at ). The resulting larvae grow for about 4 days (at 25 °C) while molting twice (into second- and third-instar larvae), at about 24 and 48 h after hatching. During this time, they feed on the microorganisms that decompose the fruit, as well as on the sugar of the fruit itself. The mother puts feces on the egg sacs to establish the same microbial composition in the larvae's guts that has worked positively for herself. Then the larvae encapsulate in the puparium and undergo a 4-day-long metamorphosis (at 25°C), after which the adults eclose (emerge).
about 4 day