Fish for the City

We’re back with new blog posts after a short summer hiatus. Our first post of the academic year (which has already begun for some of us in the US!) comes from David Orton, who is currently an Early Career Research Fellow on the EUROFARM project at University College London, where he is also a Teaching Fellow in Zooarchaeology. Here he shares research that was conducted during his previous postdoctoral fellowship at the McDonald Institute for Archaeological Research at the University of Cambridge, which was recently published in Antiquity.

A Meta-analysis of Archaeological Cod Remains as a Tool for Understanding the Growth of London’s Northern Trade

The backstory to this research comes in two parts. First, a landmark zooarchaeological study by James Barrett and colleagues (2004) demonstrated an explosion in marine fish consumption in England within a few decades of AD1000.  Before this event – dubbed the ‘Fish Event Horizon’ (FEH) in tribute to Douglas Adams – sea fishing seems to have been rare and small-scale.
Potential source regions and isotopic signatures for archaeological cod bones. Cross-hairs show one standard deviation ranges. Images taken from Orton et al. 2011 under CC BY license.

Second, James and his team applied stable isotope provenancing of cod bones to test whether this FEH represented a local phenomenon or the early onset of long distance trade from northern waters (full disclosure: I joined the project towards the end of this stage, in 2010). δ13C and δ15N signatures were established for six potential fishing regions using 259 samples from more than 10 countries. Applying this ‘target’ specimens from 23 (post)medieval sites around the North Sea (Barrett et al. 2011) and Baltic (Orton et al. 2011), we showed that a significant trade in northern cod existed by the 13th-14th centuries, but that the initial FEH in England primarily entailed local fishing. This raised more questions: when exactly did the trade start, how suddenly, and did the imported fish supplement or replace local catches?

Our new study, just published in Antiquity, combines a new zooarchaeological meta-analysis with the existing isotopic results to tell a clear story regarding cod imports to the city of London. Both elements rely on the same principle: that cod were traditionally decapitated before preservation for long-range trade, and that cranial elements thus normally represent relatively local catches. This allowed us to use head bones to establish regional isotopic signatures in the previous isotope work, but it also means that the cranial:postcranial ratio in consumer sites like London can be a rough index for the relative contribution of imports. We simply compiled all the raw data we could find on well-dated cod bones – almost 3000 specimens from 95 sites, including large datasets from Alison Locker and from MOLA – and plotted it using context-level date ranges.
Stable isotopic provenancing results for 34 archaeological cod vertebrae and cleithra from various London sites (A; data from Barrett et al. 2011) set against AD 700–1700 detail of the estimated frequency distributions (B). Figure taken from Orton et al. 2014 under CC BY license.

The data show a very sudden switch to imports in the early/mid 13th C, with frequency of cranial bones dropping off just as the number of vertebrae increases sharply. This fits the isotopic results remarkably well: before about AD1250 almost all sampled specimens seem to be local; afterwards the majority are probable imports. Locally caught cod thus seem to have been substantially and rapidly replaced in Londoners’ diet by traded fish almost 800 years ago. What this meant for the local fishing industry is uncertain, but should become clearer when we look at other towns and species.

Biomolecular provenancing has a unique ability to provide direct evidence for the source of imported bones, but its cost and destructiveness ultimately limit sample sizes and hence the reliability and resolution of the stories it can tell. Integrating it with the much larger samples that can be marshalled from meta-analyses of conventional zooarchaeological data has great potential to overcome this problem.


Orton DC, Morris J, Locker A and Barrett JH (2014) Fish for the City: meta-analysis of archaeological cod remains as a tool for understanding the growth of London’s northern trade. Antiquity 88, 516-530.

Orton DC, Makowiecki D, de Roo T, Johnstone C, Harland J, Jonsson L et al. (2011) Stable Isotope Evidence for Late Medieval (14th–15th C) Origins of the Eastern Baltic Cod (Gadus morhua) Fishery. PLoS ONE 6, e27568.
[DOI: 10.1371/journal.pone.0027568]

Barrett J, Orton D, Johnstone C, Harland J, Van Neer W, Ervynck A et al. (2011) Interpreting the expansion of sea fishing in medieval Europe using stable isotope analysis of archaeological cod bones. Journal of Archaeological Science 38, 1516-24.
[DOI: 10.1016/j.jas.2011.02.017]

Barrett JH, Locker AM, and Roberts CM (2004b) The origins of intensive marine fishing in medieval Europe: the English evidence. Proceedings of the Royal Society of London. Series B: Biological Sciences 271, 2417-21. [DOI: 10.1098/rspb.2004.2885]

From the Balkans to Barbuda

A number of new and exciting projects are focused on incorporating several techniques in zooarchaeology, including stable isotope analysis, to better understand the complex and intertwined history of humans and certain animals. In this post, Dr. Holly Miller shares some of the goals of one such ongoing research scheme: The Fallow Deer Project.

The Fallow Deer Project

The Fallow Deer Project is an AHRC-funded multi-disciplinary study looking at the cultural history of Dama dama dama, the European fallow deer. As one of two Research Fellows on the project, my role is to investigate the biogeography and management of fallow deer through time. To do this, I am using a combination of isotope analyses (C, N, Sr, S, O) to look in depth at the archaeological remains of ancient and modern fallow deer populations, investigating questions related to the importation of animals, founding herds and changing management practices. Were fallow deer domesticated? Under what circumstances were fallow deer established across Europe? How do human-Dama relationships reveal worldview?

The Fallow Deer Project Logo
The Fallow Deer Project Logo

No other species of deer has a closer relationship to people than the European fallow deer, and it is becoming clear that this has been the case for millennia. Since the Neolithic, humans have selectively transported and maintained these elegant animals, moving herds from their native, post-glaciation, range in the eastern Mediterranean, across Europe and eventually the globe. Fallow deer are now one of the world’s most widely-naturalised animals. Wherever they have been introduced they have altered the physical and psychological landscape, and their distribution is a direct record of human migration, trade, behaviour and ideology. In combination with studies of archaeology, history, geography, anthropology, genetics, and osteological research, isotope analysis is being used reveal the cultural significance of the fallow deer as they moved from the Balkans to Barbuda, and everywhere in between.

Assorted fallow deer bones
Assorted fallow deer bones

The project is led by Dr Naomi Sykes (University of Nottingham) Prof. Rus Hoelzel (University of Durham) and Prof. Jane Evans (British Geological Survey). The team are working with researchers from a number of fields and institutions up and down the UK- from archaeologists and art historians, to musicians and deer stalkers.


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