HEAT barbecue to medium-high heat.
BRUSH fish and asparagus with oil. Grill 4 min. on each side or until fish flakes with fork and asparagus is crisp-tender. Remove from barbecue; cut asparagus into 1-inch lengths.
COVER 4 large plates with spinach; top with next 4 ingredients.
DRIZZLE dressing over salads; top with salmon and asparagus.