Preheat oven to 275°F. Generously salt fish and leave at room temperate for 15 minutes.
Place the olive oil into a large ovenproof dish. Submerge the fish so it is covered 3/4 of the way. Add the garlic and herbs. Cover the fish directly with a piece of parchment paper. Place in preheated oven.
Poach the fish until firm and opaque (about 15 minutes). Gently remove the fish and discard the garlic and herbs. Strain the oil and enjoy a moist and flavorful fish.