Combine water and 1/4 cup salt in a large suacepan; bring to a boil over high heat. Add shrimp and immediately turn off the heat. Let the shrimp sit until just cooked through, about 3 minutes. Transfer to a cutting board until cool enough to handle, about 10 minutes. Chop the shrimp into 1/2 inch pieces and place in a medium nonreactive bowl. Add lemon, lime, and orange juice. Stir in cucumber, onion and chiles. Refrigerate for 1 hour. Stir tomato, avocado, chopped cilantro, oil and 1/4 teaspoon salt into the shrimp mixture. Let stand at room temperature for 30 minutes before serving. Garnish with cilantro leaves, if desired.
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