You can still hunt and trap a little, sure, but I took the previous commenter to be suggesting that one could trade agricultural civilization for a hunter-gatherer lifestyle, and I can't see how a person could get enough calories to survive that way without egregiously violating bag limits. Maybe up in Alaska or the Yukon you could still get away with it, but here in Washington, a little quick math suggests that hunting all the deer and game birds you're allowed in a year would only keep you fed for 6-8 weeks.
I don't know much about fishing, but the Fish & Wildlife website mentions daily rather than seasonal limits, so perhaps you could make it through a year that way - but hunting would be the supplement, as you'd have to live primarily on fish!
