Where was " Gunkan - maki " invented ?
Other seafoods such as squid ( " ika " ) , eel ( " anago " and " unagi " ) , pike conger ( " hamo " ) , octopus ( " tako " ) , shrimp ( " ebi " and " amaebi " ) , clam ( " mirugai " , " aoyagi " and " akagai " ) , fish roe ( " ikura " , " masago " , " kazunoko " and " tobiko " ) , sea urchin ( " uni " ) , crab ( " kani " ) , and various kinds of shellfish ( abalone , prawn , scallop ) are the most popular seafoods in sushi .