Interpreting the expansion of sea fishing in medieval Europe using stable isotope analysis of archaeological cod bones

Archaeological fish bones reveal increases in marine fish utilisation in Northern and Western Europe beginning in the 10th and 11th centuries AD. We use stable isotope signatures from 300 archaeological cod (Gadus morhua) bones to determine whether this sea fishing revolution resulted from increased local fishing or the introduction of preserved fish transported from distant waters such as Arctic Norway, Iceland and/or the Northern Isles of Scotland (Orkney and Shetland). Results from 12 settlements in England and Flanders (Belgium) indicate that catches were initially local. Between the 9th and 12th centuries most bones represented fish from the southern North Sea. Conversely, by the 13th to 14th centuries demand was increasingly met through long distance transport – signalling the onset of the globalisation of commercial fisheries and suggesting that cities such as London quickly outgrew the capacity of local fish supplies.     

Detecting the medieval cod trade: a new method and first results

This paper explores the potential of stable isotope analysis to identify the approximate region of catch of cod by analysing bones from medieval settlements in northern and western Europe. It measures the δ¹³C and δ¹⁵N values of cod bone collagen from medieval control samples collected from sites around Arctic Norway, the North Sea, the Kattegat and the Baltic Sea. These data were considered likely to differ by region due to, for example, variation in the length of the food chain, water temperature and salinity. We find that geographical structuring is indeed evident, making it possible to identify bones from cod caught in distant waters. These results provide a new methodology for studying the growth of long-range trade in dried cod and the related expansion of fishing effort—important aspects of the development of commercialisation in medieval Europe. As a first test of the method, we analyse three collections of cod bones tentatively interpreted as imported dried fish based on a priori zooarchaeological criteria. The results tentatively suggest that cod were being transported or traded over very long distances since the end of the first millennium AD.     

Proving Fishers Right. Effects of the Integration of Experience-Based Knowledge in Ecosystem-Based Management

Abstract

This article discusses effects of and drivers behind the current integration of experience-based knowledge in management. The case in point is production and integration of fishers' ecological knowledge (FEK) in coastal zone management in Norway. The article discusses how the principles of social justice and protection of biodiversity drive FEK integration, through analysing a case of conflict between small-scale fishers and cod farming in Storfjord, northern Norway. The case became known for the appearance of deformed “monster cod” which supported the fishers' claims that fish farming was harmful to the environment and thus also to the indigenous Sami culture. Assessing how FEK was judged in terms of its credibility, legitimacy and saliency, the article argues that the criteria by which FEK is judged are different from how other types of policy-relevant knowledge is judged. In addition to being scientifically credible, its quality as age-old knowledge derived from interaction with the environment increases its influence on management decisions in biodiversity conservation controversies where fishers' and managers' interests coincide. The article concludes that integration of FEK in management both fulfils goals of protection of biodiversity and social justice, which makes it harder to ignore in socially and environmentally controversial contexts in the future.     

Fish bones from the Old Town of Helsinki (Finland) sixteenth–seventeenth century

Historical sources, such as tax rolls and accounts, can provide information about mediaeval fishing and fish trade, but this subject can also be investigated through archaeological methods. Archaeological research on the mediaeval and early historical fishing in Finland has not been undertaken in any detail. Research from neighbouring areas, mainly Sweden and Estonia, has provided information about mediaeval fishing in northern Europe. This paper presents the results of a osteological examination of a sample of archaeological fish bones excavated in the Old Town of Helsinki in 1993. The sample derives from the remains of a cellar in a house, used in late-sixteenth or early-seventeenth century by a wealthy person, probably a merchant.