Preheat oven to 400 degrees. In a bowl, whisk together the lemon juice, garlic, paprika, sriracha, salt, and pepper. Lay the lemon slices on a baking sheet – about 3 or 4 slices in a row, so that the fillets of fish can sit nicely on top. I made 4 rows about 3 inches apart. Dry the fish with paper towel and lay the fillets onto the lemon slices. Top the fillets with the sauce mixture and bake for 20 minutes Remove from oven, plate and garnish with freshly chopped parsley.