Forks wrought with long tapered tines, such as a dinner fork, are made to spear pieces of food, such as steak. Forks with a wide left tine and an optional notch, such as a salad fork, fish fork, dessert fork, and pastry fork, provide extra leverage when cutting food that normally does not require a knife.
The oyster is used as a metaphor in an idiomatic saying, "The world is your oyster", which means that the whole world is laid out before you like a wonderful living buffet.. Source : Wikipedia Oysters are known as aphrodisiacs. This is studied by scientist.
The salad fork is (usually) a bit shorter than a dinner fork. The salad fork is to be used for the salad course only (NOT for appetizers!) and is to be left on the salad plate/salad bowl when finished. The fork is removed (along with the finished salad plate) before the dinner course is served.