Country Data | National Oceanic and Atmospheric Administration/National Marine Fisheries Service/Species Information System. Status of Stocks 2021: Annual Report to Congress on the Status of U.S. Fisheries. 2022. Values produced according to methodology described in document at https://www.fisheries.noaa.gov/feature-story/introducing-fish-stock-sustainability-index-30 | The Fish Stock Sustainability Index (FSSI) measures the performance of the most important federally-managed stocks that represent >80% of total U.S. catch. The Indicator is based on the overfished status of 175 stocks. 10.2% with unknown status.