Decline of freshwater fishing would have forced our ancestors to fish at sea

England - An international project shows that medieval fishermen took the sea for the first time 1,000 years ago due to a large decline in freshwater fish. The findings on the identification of marine diversity may have an increased impact on the current management of the oceans.

Researchers from the Universities of Cambridge and York were studied and dated fish bones found on archaeological sites of northwestern Europe. They found that 1000 years ago there were few species of freshwater fish caught, and they decreased over time. Intensive fishing and pollution will be responsible for this decline that would have caused major changes in the diet of our ancestors.

The study is part of a broader international project which will be the theme of the conference of CoML, Census of Marine Life (Census of Marine Life) to be held in Canada this week. The project entitled "History of Marine Animal Populations" is designed to observe the diversity and distribution of marine animals in the past and the present and the implications this might have in the future.

Another article from the University of Bologna found that new fishing equipment and boats were invented in the 1500s, which allowed the Europeans to venture up the coast for large fish in deep waters. However, the author of the study, Maria Lucia de Nicolo, said that the greatest revolution fishing occurred in mid 1600, when facilities have enabled the boats to tend the nets.

CoML researchers also found that large schools of blue whales, killer whale and sharks were in the waters of Cornwall in the 1880s. Schools of whales in the southern coasts of New Zealand could count 30 times more people than today.

The President of the CoML says: "The image of the past emerging from this study provides a new context for the contemporary management of the oceans. Understand the importance of change is essential to accurately interpret trends and make predictions. "

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