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There is no single universal USDA fish certification code. A mark on a fish package may identify an inspection program, the plant that produced the product, or a voluntary quality grade—and those meanings are not interchangeable. Start by reading the exact wording of the mark and identifying the species.
What the USDA inspection mark means
For fish products covered by 9 CFR Part 541, the official inspection legend must say “U.S. Inspected and Passed” or use an abbreviation approved by the Administrator. The regulation requires the mark to be applied mechanically and to appear on consumer packages or their labels. It indicates inspection and passage under the applicable program; it is not a quality grade. See 9 CFR § 541.2.
What the establishment number means
On covered catfish products, an establishment number—often identified as an EST number—identifies the plant where the product was produced. It may appear inside the USDA inspection mark or elsewhere on the package, provided it is prominent and legible. It identifies a facility; it is not a score, grade, or separate certification of quality. USDA FSIS explains this in its guidance on catfish inspection.
How catfish inspection differs from grading
Inspection
USDA FSIS inspection of catfish is mandatory. The inspection mark and plant number relate to that inspection program and the product’s producing establishment.
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Grading
Grading is voluntary. NOAA established U.S. Grades A, B, and C for fresh or frozen catfish; these letters describe quality grading, not whether mandatory inspection took place. The USDA FSIS consumer guidance states that “Grading is voluntary.” See USDA FSIS: How is catfish inspected? and USDA AMS Fish & Seafood Grades and Standards.
How NOAA seafood marks differ
Some seafood packages may carry marks associated with NOAA’s Seafood Inspection Program, rather than a universal USDA fish-code system. NOAA’s 2016 federal guide describes two distinct marks:
- U.S. Grade A: The guide says this mark signifies processing under federal inspection in a sanitary approved facility and meeting the established level of quality of an existing U.S. grade standard.
- Processed Under Federal Inspection (PUFI): The guide describes this as certification against safety, wholesomeness, labeling, and specification criteria at a participating establishment.
These are NOAA program marks with their own meanings; do not read them as the USDA/FSIS catfish inspection legend. NOAA’s guide is titled Federal Inspection Marks for Fishery Products and dates to 2016.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical way to read a mark on your package
- Read the wording or symbol. Look for “U.S. Inspected and Passed,” a plant number, a grade letter, “PUFI,” or another named mark.
- Identify the species. The specific inspection and grading details above apply to catfish; do not assume the same rules apply to every fish or seafood product.
- Determine what the mark does. An inspection legend, establishment number, and grade communicate different things: inspection status, producing plant, and quality classification, respectively.
- Check the program behind a grade or seafood mark. USDA AMS provides fish and seafood grades and standards, while NOAA’s guide explains its seafood inspection marks.
The official sources cited here do not establish a universal consumer-facing numerical lookup for fish-package codes. If a package has an unfamiliar mark, the exact wording, species, and a clear image are needed to identify it reliably.
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