Anchovy Spawning Stock Biomass of the Gulf of Cadiz in 2020 by the DEPM

• Main Authors: Díaz-Conde, M.P. (María Paz), Tornero, J. (Jorge), González-Cabrera, C. (Carmen), Ramos, F. (Fernando), Sánchez-Leal, R.F. (Ricardo Félix), Jiménez, M.P. (María Paz)
• Format: Other/Unknown Material
• Language: English
• Published: Centro Oceanográfico de Cádiz 2021
• Subjects: fish; pelagic fish; biomass; surveys; spawning; North Atlantic
• Online Access: http://hdl.handle.net/10508/16048

The Daily Egg Production Method (DEPM) to estimate the Anchovy Spawning Stock Biomass (SSB) in the Gulf of Cádiz (ICES, Subdivision 9a South) is conducted by Spain (Centro Nacional Instituto Español de Oceanografía, CSIC) every three years, since 2005. BOCADEVA 0720 is the sixth survey of the historical DEPM series for anchovy in the Gulf of Cádiz and was delivered on board R/V Ramón Margalef (CNIEO) from the 9th to the 17th of July 2020. The surveyed area extended from Strait of Gibraltar to Cape San Vicente (Spanish and Portuguese waters in the Gulf of Cadiz). Plankton samples, along a grid of 21 transects perpendicular to the coast were obtained for the spawning area delimitation and density estimation of the daily egg production. The survey objectives also included the characterization of the oceanographic and meteorological conditions in the study area. The samples to estimate adult parameters (sex ratio, female mean weight, batch fecundity and spawning fraction) were obtained in the acoustic survey “ECOCADIZ 2020-07”, carried out during the same period. This working document provides a d escription of the survey, laboratory analysis and estimation procedures used to obtain the Gulf of Cadiz Anchovy SSB by DEPM for 2020 in the South-Atlantic Iberian Stock.