It depends on what environment the sliced creature lives in. If it is a deep sea, there are almost no parasites. If it is a shallow sea, it depends on the shallow sea in which area. Many shallow seas are polluted, not only by chemicals, but also by microorganisms exceeding the standard. In addition, there are processing environments such as slicing. If the kitchen knife, chopping board and even the whole kitchen are polluted, there must be bacteria. Generally speaking, there are not many parasites in seafood, and bacterial pollution is possible. There are many parasites and bacteria pollution in terrestrial and freshwater organisms.