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1
Mix first 7 ingredients in small bowl. Place zucchini, eggplant, tomatoes, peppers, and onion in large bowl. Add 1 tablespoon herb mixture and 1 tablespoon oil to vegetables. Sprinkle with salt and pepper; toss to coat. Thread 1 mini pepper, 1 zucchini round, 1 eggplant piece, 1 tomato, 1 onion piece, and 1 more mini pepper onto each of 8 skewers. DO AHEAD:
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2
Place fish in medium bowl; sprinkle 2 tablespoons herb mixture over. Add 3 tablespoons oil, 3 tablespoons lemon juice, and garlic; sprinkle with salt and pepper and toss to coat. Cover and chill at least 1 hour and up to 2 hours, tossing occasionally.
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3
Simmer wine, remaining 1 tablespoon oil, and remaining 2 tablespoons lemon juice in small saucepan until reduced to 1/3 cup, about 3 minutes. Stir in remaining herb mixture. Season sauce to taste with salt and pepper. Set aside.
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4
Spray grill rack with nonstick spray; prepare barbecue (medium-high heat). Divide fish cubes among remaining 4 skewers. Grill vegetable skewers until vegetables are slightly charred and tender, turning occasionally, 10 to 12 minutes. Grill fish skewers until fish is cooked through, turning occasionally, 8 to 10 minutes.
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5
Place 1 fish skewer and 2 vegetable skewers on each plate. Drizzle sauce over.