Figure 1.

Geographical location of the archaeological Atlantic cod specimens collected from two archaeological sites in (a) southeast Norway and (b) Oslo (Oslogate 6, n = 100 and Oslo Mindets tomt, n = 6; electronic supplementary material, table S1). (c) Date estimation range (in red) and body size estimation (in circles) for archaeological samples. Specimens derive from layers placed between distinct fire layers (Branntrinn) that have been dated using archaeological methods (across the eleventh to seventeenth centuries). A total of eight fire stages (Brann1 to Brann8) have been identified and are used to describe the stratigraphy and constructions in urban development [17]. Specimens COD406 and COD407 (from Brann8) do not have a confident date estimation and are excluded from this figure. Body size is significantly different between fire layers, with fish from Brann4 significantly larger than those from Brann2 and Brann3.