Optimal GSL Artemia Cysts (Brine Shrimp) Hatching Conditions

  • A cone shaped or conical bottomed vessel should be used as the hatching container. This is used to maintain the cysts in suspension when aeration is applied at the bottom and to avoid any “dead spots”. Hatching water should have a salinity of 20ppt or specific gravity of 1,010 to 1,020
  • Hatching water should have a pH in the range of 8.0 to 8.5. This can be maintained by adding a small amount of bicarbonate to the hatching water prior to adding the artemia cysts.
  • Temperature should be maintained between 28 and 30 degrees celsius.
  • Strong aeration should be maintained throughout the hatching period
  • Strong, continuous illumination should be provided above each individual hatching container. If this is not possible, locate the hatching containers in a well list room or even exposed to direct sunlight, being careful to avoid overheating.
  • Artemia may be harvested after 18 – 24 hours.
  • Prior to harvest, remove aeration, cover hatching container to prevent light from entering and if possible, provide illumination towards bottom of hatching container. Wait until artemia nauplii have gathered around the bottom and then start harvesting the artemia.
  • The artemia should be harvested into a container that allows the excess water to escape while retaining the artemia within the harvesting container. This can be accomplished be outfitting a bucket with windows covered with a 100-micron screen and then placing this bucket within another larger container to be used as a bath. Special artemia harvesting containers are available through aquaculture supply dealers.
  • Rinse the artemia prior to feeding to completely remove all of the hatching water.