Whole Grilled Fiesta Fish

Name: Whole Grilled Fiesta Fish
Ingredients: 2 lemons, halved crossways, plus 1 lemon sliced 1/4-inch thick, optional; 1/2 cup fresh cilantro leaves, chopped; 1 tablespoon minced jalapeno; 3 cloves garlic, minced (1 tablespoon); 1 tablespoon fresh orange zest; 1 tablespoon fresh lime zest; 1 tablespoon fresh lemon zest; 1 teaspoon fresh grapefruit zest; 1/2 cup orange juice; 3 tablespoons olive oil; 2 tablespoons lime juice; 2 tablespoons lemon juice; 2 tablespoons grapefruit juice; 1 1/2 tablespoons agave; Sea salt and fresh cracked black pepper; 1 (1 1/2 to 2-pound) striped bass, scales removed and gutted; 2 tablespoons canola oil, for grill grate