Powdered sugar is a super fine sugar, finer than even castor sugar. It is often termed as 10X sugar, confectioner's sugar or icing sugar. In France, it is called Sucre Glace. The size of the sugar crystal varies 10X sugar is usually 0.010 mm, while confectioner's sugar is 0.060 mm, and icing sugar is 0.024 mm.t is a type of granulated sugar that has superfine granulated crystals, usually 0.35 mm. The term castor or caster sugar is mainly used in UK English and its Commonwealth countries. In North America, it is sold as super fine sugar.
Standard baking temperature is 350 degrees, which works just fine for fish. But you can get away with setting the temperature even lower. This extends the cooking time, which may help if other ingredients in the dish need more time to cook.
1 Bake until fish reaches correct temperature: Place fish on baking dish and bake for 10 minutes per inch of thickness uncovered and flip for additional 10 minutes, or until fish is done.2  Broiling. 3  Preheat the oven: Make sure the oven is nice and hot by preheating the oven to 350 degrees. Prepare the oven and fish: Heat the oven to the correct temperature (for fish it generally ranges from 375 to 450 degrees). 2  Prepare the fish by rubbing extra virgin olive oil all over it, as well as drizzle oil lightly over the baking dish.