Does sushi means raw fish? That is a big mistake. Look up the dictionary. Raw fish in Japanese is sashimi, NOT sushi. The original meaning of the word sushi was sour. It refers to a method used for preserving fish which using rice to cover the fish, seasoned with salt and rice wine vinegar.
The main ingredient is fish? Guess again. The main ingredient used to make sushi is sticky rice, which ironically was discarded at first as the side effect of the fermentation itself.
You can find numerous sushi varieties, and you will not find a single slice of raw fish in it, or even the fish itself. Sushi also using other seafood as topping, or neta in Japanese, such as shellfish, eel, prawn, octopus, squid, crab and even caviar. Nowadays many non sea products are also used, in example egg, turkey and beef. There are even some varieties using fruits and vegetables such as cucumber, avocado, apple and even cheese!!