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Fruit Flies
  melanogaster
  hydei

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The Bug Farm
San Rafael, CA 94903  USA

2001, 2002, 2003, 2005, 2007, 2009, J.Atchison

The Bug Farm grows Grindal worms, Fruit Flies, Microworms and more!
Use these for:

Betta adults and subadults
Newts
Salamanders
Smaller Frogs (PDFs)
Killifish, particularly Epiplaty
Gourami adults, including the smaller ones such as the "Sparkling Gourami"
Guppy adults and subadults
A staple for small Herps and young Dart Frogs
any surface feeding fish including most of the live bearing fishes
Ask us more about D. melaogaster

Wingless vs. Flightless

There is a difference. Wingless don't have any wings or may have little clumps of wing material where the wings once could be found. Flightless flies have wings, they just can't use them. I'm sure that the flies are feeling pretty silly wearing those wings and not be able to use them once they hit the top of the water. The flightless fruit fly that we use is a species called hydei sturtevant. They are much bigger that regular wingless fruit flies.

fly_comparison_closeup.jpg (8663 bytes)

 

 

 


Here's an interesting comparisonof
D. melanogaster on the left
and D. hydei on the right...the
scale is the same...yikes!

fly_comparison_closeup.jpg (8663 bytes)

Approximately life sized.


No matter what you call them or their scientific names, for the general purposes of raising a live food, fruit flies are cultivated the same way. So rather than have to use all of the words...we're just going to call them FF.

We use commercial media to raise our FF in. We are not lazy, it's just a bother to mix up home-made pasty concoctions. The home-made stuff drives the kids crazy because they think we're experimenting with dinner again. Then with the home made concoctions you will find mold to be a significant concern. To take care of the mold you would have to consider using chemicals to treat the concoction. We just find that ordering the stuff from a vendor is better for us. You might make a different finding. We carry a good quality food mix that's easy to use and produces great results...it's in our catalog under supplies.

The easiest bottle to raise these critters in is a water bottle such that one of your favorite spring waters might come in. We use pint sized (500 ml) units. We like the plastic ones (you will drop one some day). We plug the tops with a piece of sponge. The sponge allows for air transfer. When you use sponges be sure that the sponge is not a "disinfected" one that is designed for kitchen or bath use. Recently we have started putting a small amount of plastic netting into the culture prior to adding the media. The FF seem to be doing better with the netting. How significant the improvement is, we don't know and no one in this fishroom is going to dump the FF out to count them.

The media is mixed in a 1:1 ration. We put 1/4 cup of media in the bottle and then 1/4 cup of water. A pinch of Fleischmann's yeast and wait five minutes or so for the mixture to completely solidify. Add the netting and your FF culture and put the sponge in the top. Of course you can always mix your own medium...sort of pain, but there are recipes available.

A major difference between the regular and the hydei varieties of FF (besides their size) is the gestation. The larger variety takes a month to complete the cycle where the little ones, as few as 14 days.  

Harvesting is a little tricky. Sharply tap the bottom of the container in the palm of your hand and then pull out the stopper. Shake a few or perhaps tap on the container to knock a few flies out onto the water of the tank. Put the stopper back into the culture bottle. We find that after a while the fish will come to the surface when they hear the tapping on the palm of the hand, even when you are feeding the tank next door. We find that 6-8 flies per fish per feeding is an ample rule of thumb. A few less for smaller fish and a few more for larger ones.  Like any food, too many flies and they will not be eaten. While the surface tension of the water will keep the vast majority of flies in the tank, occasionally you will find a FF wandering near the tanks. Fruit flies can escape from the water tension and crawl out of the tank. We don't find this to be a problem as it is generally only a fly here and there, not like an army of them...oh and our tanks are not in our living room.

We start new cultures each week. The cultures will become less productive in a month to eight weeks. The media will go bad a couple weeks later becoming black and offering little in the way of food for the larvae. Don't  wait until the media is bad to start a new culture. Beware that heat will kill the flies. You want them to be warm but not extremely hot. Heat may leave the maggots behind and you can save the culture, but why take the chance? We keep our flies at a comfortable room temperature.

You will probably find out that your top feeding fishes go nuts over FF. Surface feeders in particular tear into FF. Some of the bottom feeder/dwellers don't attack the FF and may not eat well. You will want to observe your fishes' habits and make your own decisions. We find the FF very helpful with most of our Killies (especially the Epiplatys) and all of our Bettas. Both of these groups of fishes are capable of overeating on this food.

 

D. melanogaster

D hydei

Moisture %

74

71

Ash %

1.7

2.1

Chitin %

3.4

4.3

Protein %

17.8

18.3

Fat %

5.3

6.2

Carbohydrates

ND

ND

Calcium  (mg/100g)

ND

ND

Calcium as total P

27.8

49.6

Vitamin C mg/kg

ND

ND

Fiber %

ND

ND

calories/fat

ND

ND

"We grow food not bait"


 

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