Isochrysis is a small golden/brown flagellate that is very 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 used in shellfish hatcheries and used in some shrimp hatcheries. Fin Fish Hatcheries: Used for DHA enrichment of rotifers. It is also a good size for feeding brine shrimp and copepods. Shellfish Hatcheries: Isochrysis is the most commonly used algae for oysters, clams, mussels, and scallops Shrimp Hatcheries: Used for DHA enrichment Source : CCMP1324