Bring a large pot of salted water to a boil. Add shells and cook, stirring occasionally, until tender yet firm to the bite, about 9 minutes.

Combine oil, shallots, lemon juice, capers, dill, lemon zest, garlic, salt, and pepper in a large bowl. Stir to combine. Add in the flaked salmon. Mix to incorporate.

Drain cooked pasta and add to the salmon mixture. Toss to combine. Refrigerate before serving, at least 30 minutes. Top with freshly grated Parmesan cheese.