Facebook post by University of Helsinki

Archeologists have created a method to study Stone Age dietary culture and fishing without salmon bones. It is remarkable, because northern areas so far only six bones have been identified in over 100 years of archaeological exploration.
Archaeologist discover a rare type of evidence for prehistoric salmon fishing in Northern Finland | University of Helsinki helsinki.fi

An international team of archaeologists identified remains of salmon bones through a novel approach at the Stone Age village of Kierikinkangas in Finland.