This is the Chemical Facility Anti-Terrorism Standards (CFATS) Advisory Opinion 2020-001: Hatcheries Not Eligible for Agricultural Extension Letter.
Summary: In July 2015, the Department of Homeland Security (DHS) clarified to the California Department of Fish and Wildlife that fisheries and hatcheries do not qualify for the agricultural facilities time extension issued by DHS in 73 Fed. Reg. 1640 (Jan 8, 2008). The Cybersecurity and Infrastructure Security Agency (CISA) published a redacted version of this letter to ensure that other fisheries and hatcheries properly report any threshold quantities of chemicals of interest (COI) that they possess.
Learn more about the CFATS Advisory Opinions.