Homemade Fruit Fly Culture Media
©1996 Anthony Hundt
Below are some alternative to commercially produced culture media for fruit flies. It can be used to raise either the small fruit fly, Drosophilia melanogaster, which grows to 1/10 inch or the large fruit fly, Drosophilia hydei, which grows to 1/8 inch. At 75ºF to 77ºF (24ºC to 25ºC) D. melanogaster will mature in 10 to 12 days and D. hydei will mature in about 28 days.
Put banana and sugar in blender and mix until the banana is liquified. Mix in oatmeal until it becomes firm, but still moist. Put mixture in wide mouth quart canning jars. Add a few granules of bakers yeast to the surface and add about 30 fruit flies. Cap the jars with a paper towel folded in fourths held on with a rubber band. Substitution with other types of fruit also works.
Variation, use the
1 cup water
Mix all ingredients except yeast, then heat until boiling. Quickly pour mixture into clean culture jars. Cap and let cool to room temperature. This mixture can be stored in the refridgerator with a tightly capped lid until ready for use. When ready to use, sprinkle a couple granules of baker's yeast on the surface and add fruit flys. Calcium proprionate is a mold inhibitor used in bread.
To prepare dry culture media, mix 1 part brewer's to 10 parts instant potatoe flakes by weight. When ready for use, mix 4 grams of the mold inhibitor, tegosept (methylparaben), to 1 gallon of hot water. Let cool and add an equal amount of water to the dry culture media (by volume). When the mixture solidifies, add a couple of granules of baker's yeast to the surface and add fruit flies. Calcium proprionate may be used as a substitute for tegosept.
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