Pan-Fried Salmon with Citrus Vinaigrette

In a large skillet of boiling salted water, cook the asparagus stalks until bright green and crisp-tender, about 3 minutes. Drain and rinse with cold water. Pat the asparagus dry and transfer them to a serving platter. Drizzle olive oil over the asparagus and toss gently to coat. In a small saucepan, combine the orange, lemon and lime juices and simmer over moderate heat until reduced by half, about 10 minutes. Pour into a heatproof bowl and let cool to room temperature. Whisk in the shallot, chives and the 1/4 cup of olive oil. Season with salt and pepper. In each of 2 large skillets, heat 1 1/2 tablespoons of the vegetable oil until shimmering. Season the salmon fillets with salt and pepper and add 4 to each skillet. Cook over moderately high heat until browned and just cooked, about 3 minutes per side. Transfer the salmon to plates and spoon some of the citrus vinaigrette on top. Serve the salmon with the asparagus, passing the extra vinaigrette at the table.