Ranching and fishing, yes. But considering that worldwide more than 70% of agriculture is used to support ranching, it definitely seems that ranching is reducing the amount of food worldwide, not increasing it.
Edit: Also should mention, generally when climate activists talk about drastically cutting down or outright ending ranching, that's for the developed world, where healthy alternatives exist. Nobody sane is talking about going and taking the dairy cows off of Indian villagers who depend on it for survival.
Also, we have destroyed the global aquaculture with overfishing.