Killifish

Typical Drosophila vials. Keeping flies over damp paper in a dedicated cabinet helps maintain humidity, and prevents contamination from wild flies
Typical Drosophila vials. Keeping flies over damp paper in a dedicated cabinet helps maintain humidity, and prevents contamination from wild flies.

Why a regime?

Looking after Drosophila is quite easy when you get the hang of it. When cultures crash it's usually because they were left unattended for too long. The life span (just like the development time) is temperature dependent, and does not much exceed 2 weeks as a fly. It is critical to follow a careful regime to allow maximum production. This can take a few minutes each week and that's it. HOWEVER, miss a week and your yield will be drop, miss 2 and you may well loose your cultures! If flies are left too long over old media, they will also starve, and provide a poor snack for the fish. If you can not attend to the flies, its best to keep them cool, slowing down their life cycle (20 deg C) until you can tend to them again.

In general flies should be kept at around 25-28 degrees C. This provides a quick turnover of flies for feeding and allows a weekly regime to be followed. They also like a relatively high humidity; If yours are not kept in a humid room, consider keeping the vials in half a centimeter of water.

So how does the regime work?

The vials that the flies inhabit are separated into 3 categories:

  1. The present generation of adult flies - laying eggs for future generations (3-4 vials - top shelf of picture)
  2. Vials containing chrysalised larvae, and newly emerged flies. (10-20 vials - middle shelf of picture)
  3. Flies or larvae for feeding fish (3-4 vials - bottom shelf of picture).

Once per week newly emerged flies are collected from 2. These are placed in fresh vials, and are designated 1, the present generation. After 3-4 days these flies are moved again, onto new media 3. The old vials (which are loaded with eggs or very young larvae) go back in 2, to make future generations. Once the week has passed, the flies making the present generation can be fed to your fish, and their vials may either go back into 2, or be left for a few days to provide larvae for feeding (see part 5 - feeding fish). Of course a new generation of adult flies is again collected from 2 at the same time.

In hot weather, and if things are going well, you will soon have a lot of flies. On the other hand, you may struggle to breed enough to satisfy your fish. But always avoid feeding newly emerged flies to your fish, even if you have no shortage of flies 'coming through'. Newly collected flies may well be hungry. It's always a good idea to place them over fresh media with added brewers yeast for 24 hours before feeding them to fish, ensuring they are plump and healthy before feeding to your killies.

There are many advantages of keeping to a strict regime such as this:

  • Each vial will contain only flies/larvae of approximately the same age, resulting in eclosion (hatching of the adult fly) over a relatively short period. This reduces the time you have to hang onto older vials-making fly collection easier and lessening the chances of mold.
  • The longer flies are kept on the same media, the more runny it becomes- if the flies are collected after a 3-4 days, it will still be quite solid. Runny media can drown flies, stick them down and goes everywhere when the jar is inverted.
  • All flies will have reached sexual maturity and have reproduced before being fed.


Fruit fly cultures for sale

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First in Fly : Drosophila Research and Biological Discovery, Hardcover by Moh

Jessup, Maryland, 207**, UNITED STATES OF AMERICA

$38

First in Fly : Drosophila Research and Biological Discovery, Hardcover by Mohr, Stephanie Elizabeth, ISBN 0674971019, ISBN-13 9780674971011, Like New Used, Free shipping in the US
A single species of fly, Drosophila melanogaster, has been the subject of scientific research for more than one hundred years. Why does this tiny insect merit such intense scrutiny? Drosophila's importance as a research organism began with its short lifecycle, ability to reproduce in large numbers, and easy-to-see ... more

HEAT PACK* Made to order- BLACK hydei 32oz Fruit Fly Culture- read description

Vienna, Georgia, 310**, UNITED STATES OF AMERICA

$13

Due to winter months and cold temps, live arrival is voided without purchase of a heat pack! please be aware of this when purchasing. Live arrival voided during extreme temps. HEAT PACK OPTION AVAILABLE IF YOUR TEMPS WILL BE HIGH
Will have excelsior for surface area
DISCLAIMER: as we enter winter temps, there is a risk that cultures will not arrive alive or producing, because of this I have included a heat pack option. I will also be shipping priority VS first class so prices have ... more

Golden Hydei Fruit Fly Cultures 2 Pack+ 2 Pack of Hydei Total of 4 CULTURES

Dover, Pennsylvania, 173**, UNITED STATES OF AMERICA

$33

This 2 pack of Golden Hydei Fruit Fly cultures + 2 Pack of Hydei is the perfect addition to any reptile or dart frog owner's collection. These cultures provide a nutritious and tasty food source for your pets without the hassle of dealing with live insects. The flies are easy to maintain and will last for several weeks, ensuring that your pets are well-fed and healthy.
With free shipping included, this is a great deal that you don't want to miss out on. Whether you're a seasoned reptile ... more

Behavioral Genetics of the Fly, Drosophila Melanogaster, Hardcover by Dubnau,

Jessup, Maryland, 207**, UNITED STATES OF AMERICA

$152

Behavioral Genetics of the Fly, Drosophila Melanogaster, Hardcover by Dubnau, Josh (EDT), ISBN 1107009030, ISBN-13 9781107009035, Brand New, Free shipping in the US
... more

Flightless Drosophila Hydei Fruit Fly Culture PLUS Magnolia Leaf Litter

Woonsocket, Rhode Island, 028**, UNITED STATES OF AMERICA

$20

Flightless Drosophila Hydei Fruit Fly Culture 32oz *producing culture . These are great for reptiles, dart frogs, insects, beta fish etc. No need to wait to start feeding your pet, our producing cultures will have hundreds of fruit flies ready to feed to your pet upon arrival. This combo pack also comes with a 10pack of Magnolia Leaf Litter, an essential part of any bioactive enclosure.
All of our leaf litter has been boiled and dried prior to packing.
... more