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According to the passage, fishermen from Europe were unaware of America's existence ..........
Commercial fishing has been carried out since the
middle ages. Before that it was impossible to keep
fish for long periods, but the development of storage
methods such as drying and salting made it possible for fishermen to go on fishing trips further away, in fact, although Europeans were completely unaware of America's existence they were already fishing near its coasts then. They were, however, still unable to keep fish fresh for any length of time, All this changed as a result of the new technological advance in refrigeration in the 19th century. Soon the coastal waters of Africa and the Mediterranean were full of Northern European fishing boats. In the 20th Century, scientific discoveries made during the Second World War were used for discovering large groups of fish.