Bonito is a type of fish that is made into some styles of sushi dressings. It has a very high salinity, so it often gets compared to being similar in flavor to tuna fish which has a very high salinity as well. However, the two are not related and don't taste alike in any way due to this difference in saltiness. Bonito can be found on top of some types of sushi creations or mixed with other ingredients such as soy sauce, nori, rice vinegar and sugar for seasoning; while tuna is usually eaten individually and doesn't have any added seasoning beyond salt and pepper according to Italian tradition.