What is the knowledge of Hemingway about the sea? Discuss?

Hemmingway was an avid hunter and fisherman. He hunted in Africa, fished in the Gulf Stream near Cuba, and reported on the Spanish Civil War for the North American Newspaper Alliance. His time fishing in the Gulf provided him with a wealth of knowledge. During the mid1930s Hemingway began gathering material for The Sea, one part of which eventually became The Old Man and the Sea. The other parts, as edited by Charles Scribner, were later published posthumously in 1970 as Islands in the Stream.