Start by boiling water in a pot with half of the salt and when the water is boiled add the pasta and stir well.
In the meanwhile in a pan heat the olive oil over medium heat and add the tuna after 3 minutes and the black olives cut in small rings. Fry them for 3-4 minutes stirring well and at the end add the salt and shop and add the chives.
Remove the pasta from the water when it is ready, place it in a large bowl and add the fried tuna and olives and mix well. Cover the bowl and store the food on the fridge for about 2 hours and serve the pasta salad when it is cool.