“…Why individuals of different body size feed in different areas of the Baltic Sea could be due to shifts in abiotic ( e.g ., temperature preference; Barbeaux & Hollowed, , Morita et al ., , Otero et al ., ) and biotic ( e.g ., prey availability; Jacobson et al ., , Kallio‐Nyberg et al ., ) requirements over ontogeny. Size‐specific differences in distribution are important to consider as body size is a key trait governing how fish interact with prey (Jacobson et al ., , Mittelbach & Persson, , Scharf et al ., ), mortality risk (Lundvall et al ., , Sogard, ) and recruitment to size‐selective fisheries. That individuals from different populations occupy and feed in different areas at sea, even when of similar size, could be due to genetically controlled distribution patterns (Kallio‐Nyberg & Ikonen, , Putman et al ., , Quinn et al ., , Royce et al ., ); e.g ., via evolutionary adaption to local feeding conditions (Fraser et al ., ).…”