Wash the shrimp thoroughly, if raw, sear them in boiling water for a few seconds and drain well.
Put the shrimp in a bowl, add lemon juice and put in the fridge for 20 minutes. Then add the mayonnaise, chives, yogurt, olive oil, salt and pepper, stir, and add the blueberries.
Cut the avocados in halves and peel them. Stuff each half with shrimp mixture and serve with green salad on the side.