Section 537.1 - Basic requirements(a)(1) Any official establishment that prepares or processes fish or fish products for human food must comply with the requirements contained in 9 CFR parts 416 , Sanitation and 417, Hazard Analysis and Critical Control Point (HACCP) Systems, except as otherwise provided in this subchapter.(2) For the purposes of 9 CFR part 416 , Sanitation; 9 CFR part 417 , Hazard Analysis and Critical Control Point (HACCP) Systems; and 9 CFR part 500 , Rules of Practice, an "official establishment" or "establishment" includes a plant that prepares or processes fish or fish products.