“…In the Baltic Sea, cod ( Gadus morhua ) and flounder ( Platichthys flesus ) are the two dominant species in the demersal fish community (Lindegren, Möllmann, Nielsen, & Stenseth, ; Ustups, Müller‐Karulis, Bergström, Makarchouk, & Šics, ), and both species are of high economic importance. The Eastern Baltic cod stock (hereafter referred to as Baltic cod) has been the focus of many studies throughout the years and information on its spatial dynamics shows that it has experienced a dramatic change in abundance and distribution throughout the last century (Bartolino et al., ; Eero, MacKenzie, Köster, & Gislason, ). Conversely no studies have investigated the long‐term Baltic‐wide spatiotemporal dynamics of flounder.…”