Fine-scale catch and effort data must be reported in all fisheries, and must be submitted to the Secretariat by email (data [at] ccamlr [dot] org) before the end of the month following the month of data collection (Conservation Measure 23-04). These data are reported by Flag States on a haul-by-haul basis, and the data from longline fisheries are referred to as 'C2 data'. The C2 data form must be used by vessels operating in longline fisheries, or vessels conducting longline fishing for research purposes in accordance with Conservation Measure 24-01 or Conservation Measure 21-02.