Isochrysis is a small golden-brown flagellate commonly used in the aquaculture industry. It is high in DHA and often used to enrich zooplankton such as rotifers or artemia. Isochrysis is a primary algae found in shellfish hatcheries and in some shrimp hatcheries.This product is now glycerine free. Store in refrigerator. (Food Grade Glycerine can be added upon special request to prevent freezing by calling 801-782-4700.)