The influence of fish bone morphology on aquatic transport: An experimental approach through elements of Creole perch (Percichthyidae: Percichthys trucha; [Valenciennes, 1833])

Many archaeological sites with fish remains are situated near ancient or current water courses. The origin of these time-averaged contexts requires an analysis considering possible non-human contributions and specifically the role of water as a highly selective agent. Element shape is a critical factor in all transport processes, but it has received little attention. The aim of this experimental work is to explore the hydrodynamic transport of fish bones considering the shape of anatomical elements. Different elements from Creole perch (Percichthyidae: Percichthys trucha; [Valenciennes, 1833]) individuals are utilized in dry conditions and under three different flow speeds. Transport groups, mode of transport and distance travelled are evaluated according to the shape of the elements. Fish vertebrae have the greatest transport potential. This experimental study indicates that hydrologic processes can impose biases giving a unique skeletal element composition in fish bone assemblages. A simplified differential transport model is proposed and an archaeological application of it is essayed.