Fruit flies are an excellent food for many surface feeding killifish, closely resembling their natural diets in the wild. They are easy to culture, quickly, cheaply and in large numbers. Fruit flys are rarely available in pet shops, but are widely available online, and very much worth trying, even if you don't bother culturing them on an ongoing basis.
What is a fruit fly?
Fruit flies are small flies that live on and around decaying fruit and vegetation. They occur worldwide, except the very coldest regions. The species most familiar to scientists, aquarists and herpetologists are in the genus Drosophila which literally means 'dew-lover' in Greek. Also known as 'bar fly' or 'vinegar fly', these little flies are commonly found around waste bins, bars, orchards etc, and they are widely used in laboratories as research animals. The species we feed to our fish however, have been bred to have shorter 'vestigial' wings, and as such can not fly. These are typically from two species Drosophila melanogaster and Drosophila Hydei.
Why fruit flies?
Although dealing with highly mobile flies can be trickier than with worms, there are some great reasons to consider culturing them.
- Nutritious - all fish can be trained to eat flies, but surface feeders love them. Not only are they relished by the fish, but they also have a high fibre content, and are therefore a great contrast to the fattier foods such as worms and beef heart. They are also typically disease-free, unlike some aquatic livefoods.
- Prolific An adult fly can lay 20+ eggs in a day. Once you get the hang of it, fruit flies are easy to maintain, and at 25 deg. centigrade the development of Drosophila melanogaster takes just 9 days.
- Availability - unlike collected livefoods, cultured Drosophila are available all year round.
- Flightless flies available - fruit flies have been studied in laboratories for very many years, and a lot is known about the humble fruit fly. Over the course of these studies, geneticists line-bred many strains of fly, including vestigial-winged, and even wingless flies. These are the flies typically cultured by hobbiests.
Drosophila larvae in a typical culture
Drosophila larvae climb up the walls of their vials and chrysalise
Drosophila life cycle
Adult flies lay a lot of eggs. A single female can lay over 20 eggs in a day, and can store sperm within her body for up to two weeks, to lay fertilized eggs at will.
Eggs take 23 hours to hatch at 25 deg C. Once they do hatch, the larvae bury into the media and grow. They will stay as larvae for five days, in which time they undergo three moults.
Eventually they will start to climb the sides of the vial, and when fully grown will settle near the top, and form a chrysalis. The change from maggot to fly takes around three days, but again, is temperature dependent.
The image to the right shows a newly formed chrysalis with the lava's segments still visible (1), an older chrysalis with the fly clearly visible. The red dots are its eyes (2) and an empty chrysalis from which a fly will have hatched (3).
Once the flies have emerged they must be moved to new vials, as there is now no food suitable for them in the old vials.
Fruit fly cultures for sale
PORT ANGELES, WASHINGTON, 98363, USA
Wingless Drosophila Melanogaster Fruit Fly Culture 100 Flies..FREE SHIPPING! Powerful eBay listing templates by 3Dsellers... more
PORT ANGELES, WASHINGTON, 98363, USA
You will receive:(1) Hydei Starter Fruit Fly Culture (100 Fruit Flies!)Plus, (Bonus) Fruit Fly Kit with your order you will receive the following. 1 - 32 oz plastic container and lid. 1 - pkg. Fruit fly media 1 - pkg. of baker's yeast 1 - pkg. excelsior Instructions Hydei flies measure about 1 / 8" and are quite a bit larger and meatier than D. melanogaster. Note this strain will not revert back to fliers at a higher temperature unlike flightless melanogaster.When your package arrives, the best... more
BERWYN, ILLINOIS, 60402, USA
4 Fresh Drosophila Hydei fruit fly cultures. Cultures are made with The Suburbian Fly enhanced media. Not the average flies, not the average culture! Our cultures are kept at optimum conditions to guarantee high yields and successful hatches. No more crashes!Our Media has been developed to provide the best flies!High Yields * 100% Organic * Natural Mold inhibitors (longer lasting) * Packed with Natural Vitamins, Mineral, Carotenoids * Natural Color Enhancers Our cultures are Flightless fruit fly... more