Alternative approaches to the revision of official species composition for the Spanish log-associated catch-and-effort data for tropical tuna species in 2018

To provide the Working Party on Data Collection and Statistics (WPDCS) with a range of alternative scenarios for the re-estimation of tropical tuna species composition of time-area, log-associated catches reported by the Spanish component of the European Union purse seine fleet in 2019, and the rationale for this re-estimation