Spirulina Brine Shrimp? uses the innovative technique of bio-enrichment to deliver essential nutrients to fish. A Spirulina formula is fed to live brine shrimp before freezing. By doing so, nutrient levels are enhanced to promote fish health. Although excellent for day to day feeding, this product can be fed to your fish prior to a stressful situation, such as a move or a transfer, to help boost the immune system.,