Bring the pineapple juice and blueberries to a boil in a small saucepan. Cook until the blueberries soften and pop and the juice is thickened and syrupy, about 15 minutes. Stir in the peaches and cook for 5 more minutes. Remove from the heat and set aside.
Meanwhile, whisk the yogurt, eggs, sugar and zest in a large bowl until combined. Mix together the flour, baking soda and 1/2 teaspoon salt in a small bowl and fold into the yogurt mixture until combined.
Heat a large nonstick skillet or griddle over medium heat and coat with cooking spray. Working in batches, pour the batter about 1/4 cup at a time, evenly spacing the pancakes, onto the skillet or griddle. Cook until the tops are bubbly and look slightly dry, 2 to 3 minutes, then flip carefully and cook until golden and cooked through, 2 to 3 minutes more. Repeat with more cooking spray and the remaining batter. Serve the pancakes hot with the blueberry-peach sauce.
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