For over a year he had been beating his way along the south shore of Lake Superior as a clam-digger and a salmon-fisher or in any other capacity that brought him food and bed.

from F. Scott Fitzgerald – The Great Gatsby (Chapter VI) on Rap Genius

Meaning

Lake Superior is one of the Great Lakes in the U.S.

Clam digging is very dirty task and is still around today. There are multiple ways to harvest clams living in mud-flats. Some of these included a “clam hoe”, spading fork, or tongs.

Salmon fishing is still very popular on Lake Superior
http://www.youtube.com/watch?v=gHurTguaGeQ

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