1) Take an empty plastic ice-cream box or similar. Cut the lid in half. Press one half down into the box, approximately at the middle of the box, so the box is divided into two halves. It should be a tight fit to the walls of the box, but a few millimeters free between the bottom and the edge of the lid. You’ll probably need a few pieces of tape to hold the lid in place.
2) Dissolve one heaping tablespoon (about 20 grams) of table salt, with or without iodide, in one liter of tap water, then pour the salted water into the ice-cream box until it’s about 1/2 – 2/3 full.
3) Put about one milliliter (about 1/4 teaspoon – don’t use too much, 1/4 teaspoon is plenty!) of Artemia-eggs on one side of the “barrier”, and place the container where it’s light (improves hatching rate) and the temperature is between 20 – 30° Celsius (25 – 27°C is ideal).
4) At 25°C the eggs hatch after about 24 hours. You’ll be able to see the Artemia like little brownish, jumping, “dots”. If you see no hatched Artemia after 24 hours, don’t worry! Some strains take a bit longer to hatch.
5) Artemia are attracted to light, so light a lamp by one corner of the ice cream box, on the other side of the barrier from where the eggs are.
6) The Artemia will now swim towards the light, under the barrier, and congregate in a dense swarm closest to the light.
7) You can now easily siphon out the artemia into an artemia sieve or reusable nylon coffee filter, while the empty eggshells remain on the other side of the barrier. What you see in the sieve below is about 1/10th of the total amount of Artemia I got this batch.
8) Wash the Artemia (not strictly necessary, it’s to get rid of salt & bacteria) by gently rinsing them, still in the sieve/filter, with tap water. If you use a flat-bottomed sieve (like in the picture) it helps to tilt the sieve a little, to concentrate the Artemia to one corner of the sieve.
8) Done! All you have to do now is flush the Artemia from the sieve/filter down to your fish!
Repeat as necessary!
The Artemia should be used as soon as possible after hatching, as it quickly loses nutritional value. As all eggs hatch within a day or two, you’ll need to start anew, with fresh water and eggs, every two days. By having two hatching boxes running with one days interval, you can have constant access to freshly hatched Artemia.