Fish and Ships

How to recognise stockfish from its bones

Bart Holterman, 22 December 2016

For most readers of our blog, probably the most mysterious part of our research is the work of Hans Christian Küchelmann, archaeozoologist, who uses archaeological finds of fish bones as traces of the late medieval North Atlantic (stock)fish trade. A fish bone found in the ground, however, does not say where the fish once came from or to which fish it belonged. So, how can one identify a stockfish merely by its bones? This blog post will shed a light on that mysterious procedure.

1. Stockfish production

In order to be able to identify a stockfish bone, it is essential to know how stockfish was produced. Luckily, stockfish is made in Iceland and Northern Norway to this day in ways that have hardly changed over the centuries, so in combination with historical sources, we can reliably reconstruct what a medieval stockfish must have been like.

Stockfish is made in polar regions from fish from the Gadidae family where they are hung to dry outside during the winter. Due to climatic conditions this is only possible in arctic regions as the cool weather prevents the fish from rotting before it dries. However, the entrails must be removed before the fish is hung to dry, and the heads are cut off. This is roughly done with two methods: a) the fish is gutted and beheaded, the rest of the body left intact (rundfisk), or b) the fish is beheaded and split in two, removing the entrails as well as most of the spinal column, and then hung to dry. The latter method is called råskjær in Norwegian (rotscher in the Low German medieval documents). As this leaves only a few caudal (tail) vertebrae in the stockfish, most bones of stockfish will come from rundfisk.

2. Species and distribution

As mentioned, stockfish was made from species of the Gadidae family. A trained eye will have no problem recognising a bone from a Gadidae fish in most cases. Due to long travel times and the absence of freezers in pre-industrial times, these fish could only be transported in preserved form, either salted or dried. Hence, a find of a Gadidae bone, especially on inland sites, hints at having belonged to a stockfish.

However, in coastal areas these fish were also eaten fresh, so how do you know a bone is from stockfish in that case? It is necessary to look at the distribution of the different Gadidae species. Three of the species that were used for producing stockfish, namely saithe (Pollachius virens), ling (Molva molva), and tusk (Brosme brosme) do not appear in the Southern North Sea and Baltic Sea. Bones from these three species found on the European mainland, especially in inland areas, are therefore a strong indicator for stockfish.

3. Size

By far most of the stockfish, however, is and was made from cod (Gadus morhua), which does live in the Southern North Sea and the Baltic Sea. Bones of cod could therefore also belong to locally caught (and therefore not dried) fish. So we need another indicator to distinguish a stockfish from fresh local cod. The cod which live around the German shores are mostly smaller juveniles, older and larger fish live further North. By comparing the size of the bones to those of complete skeletons it is possible to estimate the size of the fish they belonged to. Bones belonging to fish larger than c. 75cm are less likely to have been local catch and were probably imported in dried form. Moreover, a high prevalence of fish in a specific size range is an indicator of stockfish, as these were sorted and sold according to size, whereas local catches will likely show a higher variety of fish in different sizes.

4. Bone composition

Because the head of the fish was cut off and remained at the production site one can expect head bones to be absent at consumption sites. Indeed, we find a clear overrepresentation of post-cranial (i.e. bones not belonging to the head, from cranium: head) bones on some sites in mainland Europe. On some archaeological sites in Iceland, for example, there are almost only cranial bones which is a clear sign that stockfish was produced there.

5. Cutting and hammering marks

The production and consumption of stockfish can also leave traces on the bones themselves. For example, the heads of fish were chopped of in a standardised way, leaving clear-cut chopping edges on the bones of the shoulder girdle directly behind the head. Also, the preparation of stockfish required hammering the fish for a while before soaking it, to make the flesh softer. As we have seen from our own experiences in preparing stockfish, this procedure can destroy or deform the vertebrae of the fish. Hence, deformed or broken vertebrae can be a sign of stockfish consumption in the archaeological record.

6. Isotope and aDNA analysis

Further, more advanced evidence from the North Atlantic stockfish trade can be acquired by applying methods such as aDNA analysis and isotope analysis, which can potentially retrace the remains of an animal to the area in which it lived. However, an explanation of these techniques might be a topic for a next post.

Further reading

Barrett, James H. (2009): Cod bones and commerce: the medieval fishing revolution. – Current Arrchaeology 221, 20-25

Heinrich, Dirk (1986): Fishing and the Consumption of Cod (Gadus morhua Linnaeus, 1758) in the Middle Ages. in: Brinkhuizen, Dick Constantijne & Clason, Anneke T. (eds.): Fish and Archaeology.

Ólafsdottir, Gudbjörg Ásta / Westfall, Kristen M. / Edvardsson, Ragnar / Pálsson, Snæbjörn (2014): Historical DNA reveals the demographic history of Atlantic cod (Gadus morhua) in medieval and early modern Iceland. – Proceedings of the Royal Society of London B 281

Orton, David C. / Morris, James / Locker, Alison / Barrett, James H. (2014): Fish for the city: meta-analysis of archaeological cod remains and the growth of London’s northern trade. – Antiquity 88, 516-530

Posted in: General

Project presentation at the 18th Meeting of the ICAZ Fish Remains Working Group (FRWG) in Lisbon

Hans Christian Küchelmann, 8 January 2016

On the 30th of September I held a presentation at the 18th Meeting of the Fish Remains Working Group in Lisboa. The Fish Remains Working Group (FRWG) is a subject specific working group of the International Council for Archaeozoology (ICAZ), operating since 1980 with regular biennial research meetings and publications on archaeological fish remains. Its 18th meeting was entitled “Fishing through Time – Archaeoichthyology, Biodiversity, Ecology and Human Impact on Aquatic Environments” and was held in the Museu da Sociedade de Geografia de Lisboa from the 28th of September to the 3rd of October 2015. For further information on the programme of the conference see the book of abstracts.

The theme of the conference fit perfectly to one of the research goals of our project, which I presented within the session “Multi-disciplinary Approaches to the Study of Fish Remains: Archaeology, written and illustrated Sources”. My presentation was entitled “Hanseatic trade in the North Atlantic: the archaeozoological evidence” and its main aim was to introduce our new research project to the archaeo-ichthyiological community, to inform about the historical background, to present an overview of the evidence accumulated so far, to show the potentials and limitations of the data, and to present preliminary results.

The conference was a fantastic opportunity to get in contact with colleagues working on related topics. For example Jennifer Harland or Rebeccca Nicholson, who are working on fish remains from medieval sites in Scotland and Orkney, James Barrett who analysed the fish bones from the wreck of the Mary Rose (AD 1545), Lembi Lougas who presented material from two hanseatic wrecks in Tallinn, and Jan Bakker, who prepared a poster on fish remains from the hanseatic city of Cologne. Most important was a meeting with James Barrett, head of the international project “The Medieval Origins of Commercial Sea Fishing”, based in Cambridge. We discussed  the possibilities for future cooperation between the two projects.

Apart from the scientific part, the organisers provided a fantastic field trip, which included a visit to the fish market of Setubal.

Posted in: Reports