Country Data | Department for Environment. Food and Rural Affairs (DEFRA). 2019. Time series values produced according to methodology described in Metadata document for the national indicator can be consulted at https://sdgdata.gov.uk/14-4-1/ | Indicator based on 57 stocks for which data are available and derived from stock assessment reports. of which 22.8% of fish stocks have unknown value. Some straddling stocks are included.