Schizochytrium sp. is a microalgae which occurs in mangroves in the south pacific sea. Through selection of a different schizochytrium species they developed a strain for use which does produce EPA and DHA.
This oil is used in food additives and food supplements for many years.
Schizochytrium is not grown in an open pond but cultivated in sterile fermenters under controlled conditions (in the U.S.) Since there is no impact of environmental pollution on the algae it is free from residues like heavy metals, mercury, pesticides or dioxines, as found in many natural fish oils.