I live on the north coast of California. There is wilderness all around, and I can fish both salt and fresh water, as well as hunt both large and small game. I don't think there would be too much competition for subsistence resources ten or more miles outside of town, but one never knows. People have a tendency to panic, and stocking up by way of overharvesting might be a priority for some if not most. Communal cooperative efforts might be the way to go in avoiding resource depletion.
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The Bell Curve says ignorance is normal.