Sprinkle salmon with salt. In a large nonstick skillet, heat oil over medium heat. Place salmon in skillet, skin side up; cook until fish just begins to flake easily with a fork, 4-5 minutes on each side. Remove from pan; keep warm., In same skillet, combine water, vinegar, lemon juice and brown sugar. Bring to a boil; cook until liquid is reduced to about 1/3 cup, stirring occasionally. Serve salmon with sauce; sprinkle with pepper.