Key Takeaways
- Hunter-gatherers introduced brown trout into Norwegian mountain lakes around 7000 years ago.
- The oldest fish traps found in Lake Tesse date back to approximately 4950 BC.
- This discovery marks the earliest known example of human-mediated translocation of fish.
Archaeologists have uncovered evidence that hunter-gatherers transported brown trout into Norwegian mountain lakes as early as 7000 years ago, according to a study published in New Scientist. The findings challenge previous theories about how these isolated high-altitude lakes became home to thriving populations of fish.
The research, led by Axel Mjærum from the University of Oslo, Norway, focuses on Lake Tesse, located at an elevation of around 850 metres. Radiocarbon dating of ancient fish traps revealed that the oldest trap dates back to approximately 4950 BC, providing a timeline for when humans first introduced trout into the lake.
Prior to this discovery, alternative theories suggested that birds or natural migration could have brought fish and eggs upstream. However, geographical features such as large waterfalls make natural dispersal impossible in most Norwegian mountain lakes, including Lake Tesse. This new evidence supports the idea that hunter-gatherers played a crucial role in establishing these populations.
The study also highlights the sophisticated methods used by ancient communities to manage their environment for food security. The traps found in Lake Tesse were part of an elaborate system maintained over several centuries, indicating ongoing human activity and management of fish resources.
While the exact method of transporting fish remains unknown, researchers speculate that people may have used waterskins or other means to carry trout into the lakes. This practice is believed to have occurred during summer foraging trips when hunter-gatherers would spend part of their time in mountainous regions hunting reindeer and fishing before returning to warmer valleys or coastal areas.
The introduction of fish by hunter-gatherers represents an early example of environmental management, centuries before the advent of farming in Scandinavia. This discovery not only sheds light on ancient human behavior but also provides insights into how prehistoric communities adapted to their environments and ensured a steady food supply.
Further research is needed to fully understand the extent and methods of fish translocation by hunter-gatherers across different regions. However, this study marks a significant step in our understanding of early human interactions with aquatic ecosystems.
