For thousands of years, the waters of southern Denmark’s Syltholm Fjord provided a vital source of sustenance for prehistoric communities. A pioneering study recently published in the open-access journal PLOS One unearths the remarkable story of human interaction with aquatic ecosystems from the Mesolithic through to the Bronze Age, offering new insights into the enduring balance between fishing practices and environmental sustainability during this dynamic prehistoric era. This research, led by Daniel Groß of the Museum Lolland-Falster alongside Sofie Folsach Hellerøe from Aarhus University and colleagues, integrates archaeological evidence and zooarchaeological analyses to challenge longstanding assumptions about the Neolithic transition and subsistence strategies in Scandinavia.
The Syltholm Fjord, located on the island of Lolland in southern Denmark, serves as a rare and rich archive of prehistoric activity that spans a period from approximately 4500 BCE to 800 BCE. This timeline encapsulates epochal shifts in human culture, notably the introduction and establishment of agriculture and domesticated livestock around 4000 BCE. By meticulously analyzing the remains of both aquatic and terrestrial fauna uncovered from successive archaeological strata, the research team has constructed an unprecedented diachronic perspective on dietary patterns and economic adaptations that persisted through millennia. The study’s scope bridges the Mesolithic-Early Neolithic transition, the Middle and Late Neolithic periods, and the Bronze Age, revealing continuity and complexity in subsistence that defies simplistic narratives.
Contrary to the widely held view that the Neolithic period marked an abrupt shift away from foraging toward exclusive reliance on agriculture, the assemblages studied reveal that fish remained a crucial component of the human diet alongside domesticated animals. Fish taxa, particularly benthic flatfish such as flounder, constituted a significant and persistent fraction of the aquatic remains throughout all periods examined. Eels were equally prominent across the temporal spectrum, with the exception of the Late Neolithic, an epoch characterized by a possible reduction in local settlement activity. This pattern indicates that prehistoric fishers demonstrated selective targeting and sustainable harvesting of key species, potentially practicing ecological knowledge that ensured resource longevity over multiple generations.
The presence of domestic animal bones across all stratigraphic layers confirms that livestock husbandry was well established by 4000 BCE. However, the coexistence of consistent fish remains suggests dual reliance on both farming and aquatic exploitation, illustrating a more nuanced subsistence economy than previously acknowledged. Such integrative foraging and farming strategies may highlight adaptive responses to local environmental conditions, socio-cultural preferences, and resource availability, painting a picture of prehistoric communities as versatile subsistence specialists rather than strict agriculturalists.
Terrestrial fauna exhibited more variability in their representation across periods, with deer remains increasing in frequency after 3000 BCE. This uptick in venison consumption possibly correlates with cultural transformations that reemphasized hunting practices alongside sustained agricultural efforts. Moreover, the study documents a reduction in species diversity within both land and aquatic assemblages between 4000 and 3000 BCE, interpreted as an anthropogenic impact exerted through intensified resource utilization. Nonetheless, the faunal diversity stabilized in subsequent periods, further suggesting adaptive management of natural resources to mitigate environmental degradation.
The archaeological evidence extends beyond mere identification of prey to encompass structural innovations in fishing technology, exemplified by the excavation of Stone Age fish weirs at Syltholm. These constructed traps affirm the sophistication of prehistoric fishing techniques and underscore the enduring importance attributed to aquatic resources. Fish weirs would have enabled efficient harvesting of migratory fish species, thereby contributing to both food security and social organization within these communities. The persistence of such infrastructural investments across millennia reinforces the hypothesis that Neolithic fishing was conducted with an awareness of ecological sustainability.
In framing these findings, the authors contest the traditional paradigm of a sharp dietary rupture coinciding with the onset of agriculture. Instead, they propose that the Neolithic transition represented a composite process wherein fishing, hunting, and farming were complementary livelihood elements. This integrative framework aligns with growing archaeological and isotopic evidence suggesting diverse subsistence mosaics across prehistoric Europe rather than monolithic economic shifts. The study situates Syltholm as a microcosm for broader processes of cultural and environmental interaction in prehistoric Scandinavia and beyond.
Dr. Daniel Groß emphasizes the ecological implications of this research, highlighting that “even though people were fishing in the fjord for millennia, their impact on the environment was not clearly traceable,” a finding that challenges assumptions about prehistoric environmental degradation. The evidence for sustained, selective fishing suggests an early form of resource management that maintained ecosystem integrity over extended temporal scales. These results invite reconsideration of how prehistoric societies balanced resource extraction with conservation within variable landscapes.
Equally notable is the research team’s multidisciplinary methodology, which synthesizes zooarchaeological data, stratigraphic context, and cultural analyses to reconstruct past human-environment interactions comprehensively. By integrating diverse datasets, the study exemplifies the importance of holistic approaches to understanding prehistoric lifeways. Such methodologies foster richer interpretations of archaeological contexts and expand the temporal narrative of subsistence beyond artifact typologies to encompass ecological dynamics and social complexity.
This study’s findings have far-reaching implications for archaeological discourse on prehistoric economies, environmental archaeology, and sustainable resource management history. It underscores the value of long-term environmental archives in tracing human adaptations and cautions against oversimplified evolutionary models glossing over regional and temporal variability. Furthermore, it highlights the potential resilience of traditional subsistence systems and their lessons for contemporary conservation biology.
In conclusion, the prehistoric inhabitants of Syltholm Fjord exemplify a dynamic nexus of fishing, hunting, and farming strategies persisting harmoniously across millennia. Their nuanced engagement with aquatic resources demonstrates not only technical ingenuity and ecological knowledge but also resilience in the face of profound cultural and environmental changes. This research redefines understandings of the Neolithic transition as a complex, integrative process and spotlights prehistoric Scandinavia as a critical frontier for investigating human-environment coevolution.
For those interested in exploring this topic further, the full article “Fishing for millennia: Effects and impacts of prehistoric fishing in the Syltholm Fjord, Denmark” is freely available via PLOS One with DOI: 10.1371/journal.pone.0347863.
Subject of Research: People
Article Title: Fishing for millennia: Effects and impacts of prehistoric fishing in the Syltholm Fjord, Denmark
News Publication Date: 13-May-2026
Web References: http://dx.doi.org/10.1371/journal.pone.0347863
References: Groß D, Hellerøe SF, Koivisto S, Schmölcke U (2026) Fishing for millennia: Effects and impacts of prehistoric fishing in the Syltholm Fjord, Denmark. PLoS One 21(5): e0347863.
Image Credits: Museum Lolland-Falster, CC-BY 4.0
Keywords: Prehistoric fishing, Neolithic transition, sustainable subsistence, Syltholm Fjord, archaeological zooarchaeology, Stone Age fish weirs, Denmark, aquatic resource management, Bronze Age, Mesolithic, Early Neolithic, subsistence strategy
