Data on variation in the abundance of mass fish species at early stages of ontogenesis in different areas of the Eastern Central Atlantic in warm (June–November) and cold (December–May) seasons of 1994–2012 have been analyzed. The representatives of the mass species in the region are European pilchard Sardina pilchardus , common scad Trachurus trachurus , chub mackerel Scomber japonicus , round sardinella Sardinella aurita , Cunene horse mackerel T. trecae , and Atlantic bonito Sarda sarda . Within the economic zone of Morocco, variations in abundance of the representatives of the subtropical fauna ( S. pilchardus, T. trachurus , and S. japonicus ) at early stages of ontogenesis are similar over the entire area under study (32°–21°N). In the area of Mauritania (21°–16°N), variations in the abundance of the mass fish species of the tropical fauna ( S. aurita , T. trecae , and S. sarda ) at early stages of ontogenesis cannot be unambiguously compared with such variations in the area of Morocco because Senegal-Mauritanian populations of the species inhabit waters of different states and are not completely assessed by our surveys.