Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella

• DOI: 10.1111/fog.12218
• Publication Date: 2017-05-18T07:29:45Z
• Authors: Modou Thiaw; Pierre‐Amaël Auger; Fambaye Ngom; Timothée Brochier; Saliou Faye; Ousmane Diankha; Patrice Brehmer
• Keywords: Sardinella

Abstract The objective of this study was to assess the effect environmental variations on abundance Sardinella aurita and maderensis in Senegalese waters upwelling system. Monthly data indicating sardinella were first estimated from commercial statistics, using Generalized Linear Model 1966 2011. Abundance indices (AIs) then compared with indices, at local scale, a Coastal Upwelling Index (CUI) coastal Sea Surface Temperature (SST) index, large North Atlantic Oscillation (NAO), Multidecadal (AMO) Multivariate El Niño Southern (MEI), correlations times series analyses. results showed that is determined by strong seasonal pattern inter‐annual fluctuations. S. peaked spring autumn, whereas warm season (July–September). trend significantly correlated CUI, especially autumn spring. Interannual fluctuations are, respectively, driven precocity duration attributed distinct migration patterns. Both species also respond delay around 4 years winter NAO index AMO both related wide biomass are caused conditions, which should be considered implementation an ecosystem‐based approach stocks management.