Brine shrimp should be stored in a cool place in the unopened bag they are sold in, It is advisable to use as soon as possible but brine shrimp should keep for a few days if kept cool and out of sunlight. They can be kept in the fridge if preferred although this shouldn't be necessary. Once opened, if not all used in one feed, they need to be kept in the water they were supplied in - do not replace this with fresh water. The best way to store the opened bag is to place it upright in a tall glass.
If feeding brine shrimp to freshwater fish strain the contents of the bag through a net with a mesh size no larger than 500 microns (0.5mm) and add just the shrimp to the aquarium from the net. This avoids adding salt water to the fresh water environment. For marine aquariums it's OK to add the entire contrents to the aquarium, or if preferred, you can filter thorugh a net as above.
One bag of brine shrimp is about the right quantity for a single feed for aquariums over 24 inches, although this is obviously dependent on the amount and type of fish. The bulk of the brine shrimp introduced into an aquarium should be consumed within 15-20 minutes. Don't worry if there are a few odd ones left after this time as they will live for up to 5 hours in fresh water and your fish will hunt them down and eat them.
