Why are Chinook salmon in patagonia so much bigger than Chinook on the Great Lakes? For starters, Chinook in Patagonia have an open ocean diet, meaning their food tends to be larger in size and more plentiful than lake salmon. Secondly, their feeding season is mostly year round, while Great Lakes fish face the winter season, where feeding slows down. Third- the Great Lakes are fished heavily, limiting potential for full growth, while Patagonia salmon are mostly left alone. Even with tourist fish