Tisquantum (January 1, 1585 – November 30, 1622), also known as Squanto, was the Native American who assisted the Pilgrims after their first winter in the New World and was integral to their survival.
In an unreferenced piece Wikipedia says: "It is a commonly held belief that he helped them recover from an extremely hard first winter by teaching them the native method of maize cultivation. This story claimed a method that utilized local fish (menhaden) to fertilize crops. He is commonly thought to have taught the colonists how to catch the menhaden necessary to fertilize maize in the native fashion along with the methods by which they could catch eels and other local wildlife for food."
Even if I'm not a horticulturist, after reading the piece above, just because it is not directly referenced, two questions arose to my mind:
1) Did Indians of North America really use fish as fertilizer?
2) If the answer to 1) is no, by who Squanto have learned that horticultural technique?