Preheat the oven to 375°F (190°C) and prepare a greased baking dish.

Combine crab meat, shrimp, cream cheese, mayonnaise, Dijon mustard, lemon zest, garlic, parsley, dill, Old Bay seasoning, salt, and pepper in a mixing bowl.

Create a pocket in each salmon fillet by cutting a deep slit without cutting all the way through.

Stuff the salmon fillets with the seafood mixture, securing with toothpicks if necessary.

Place stuffed fillets in the baking dish, adding lemon slices on top, and bake for 20 to 25 minutes until done.

Broil for an additional 2 minutes for a golden crust, watching closely to avoid burning.

Let the salmon rest for five minutes before serving.