The actual number changes periodically and is classified. Most numbers that you'll see in media outlets are estimates of force numbers. Actual fleet configuration and numbers is considered critical data that can be used by an enemy for attack planning, which is the reason it is not released as a definitive number to the public.
There is no set number; like all fleet commands around the world, the number of naval assets assigned to 2nd Fleet changes constantly. This is because ships form different Task Forces, Battle Groups, etc., and may leave the 2nd Fleet's operational command area and enter another, or they're formed/assigned as tactical considerations warrant. Ships and other assets that might be assigned to 2nd Fleet's command may be from another Fleet; it depends on the situation and needs of the Navy.
What country? For the US, a Fleet is an Area Of Responsibility, not a group of ships, which also has many names. Be more specific.
United States Second Fleet ended in 2011.
United States Second Fleet was created in 1950.
The number of ships needed to to make up an Armada is different depending on what type of Armada you are making. It can take anywhere from 30 to 150 ships to make up an Armada.
American
The US came to Japan to demand trading rights.
(The noun fleet is a group of ships, the adjective means fast or quick.)Our ship was part of the fleet.Our ship was very fleet compared with some of the older and slower ships.
The Great White Fleet, when a battle fleet painted their ships white and sailed around the world. http://en.wikipedia.org/wiki/Great_White_Fleet
The Atlantic Fleet region, or 2nd Fleet AOR (Area Of Responsibility), covers the entire Atlantic Ocean, Carribean, North to South until the Mediteranean Sea and Indian Ocean. The ships making the fleet are stationed at various ports. Any ship operating in the 2nd Fleet AOR can be considered part of the Atlantic Fleet, including ships that come over from the West Coast to the east coast.
Japan attacked the US fleet in Pearl Harbor with naval aircraft, sinking many ships and killing many people.
8 ships? Whose 8 ships? The US had more than eight ships in the harbor; and Japan had more than eight warships in their attack fleet.
The entire Pacific Fleet of the US Navy has never been sunk. When Japan bombed Pearl Harbor on December 7th, 1942, just over 50% of the ships assigned to the Pacific Command were sunk. Throughout WWII, many ships were sunk, some the original ships from the Pacific, some that came over from the Atlantic. The US, so far, has not suffered true defeat at the hands of any foe.