Place the citrus juices in a saucepan and stir over medium heat until it is reduced by 1/2. At that point set it aside. Bring the sake to a boil, dissolve in the maple syrup, let this cool. Once it is cool, take the 4 fillets Sablefish, place in a non-reactive deep dish pan, or small pan and cover with the sake/maple syrup mixture and marinate this for 24 hours, refrigerated.
Take the Sablefish out of the marinade. On a damp cloth simply spot the fish and then, on a large cookie sheet lined with either parchment paper or waxed paper, place the fish skin-side up and flesh-side down, bake in preheated 375 degree oven for 10 minutes, then remove from heat.
Quickly bring the orange, grapefruit and lemon juice to a boil, stir in the butter until dissolved. Add soy sauce. Check for seasoning. In 4 individual bowls equally divide the orange segments, grapefruit segments and lemon segments, place some of the soy and orange sauce in the bowls, place the fish on the top of the citrus, the salad on top of the fish and serve immediately.