Grilled Whole Mackerel with Lemon, Oregano, and Olives

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Ingredients in this Recipe

1 (3 1/4 to 3 1/2 lb) cleaned whole Spanish mackerel or bluefish (with head and tail)
1 1/2 tablespoons fresh lemon juice
1/2 teaspoon finely grated fresh lemon zest
1/3 cup extra virgin olive oil
1/4 cup pitted Kalamata olives (1 1/4 oz), cut into slivers
2 tablespoons vegetable oil
3 tablespoons finely chopped fresh oregano plus 6 large sprigs
6 (1/4 inch thick) lemon slices

See Full Recipe at Epicurious