Principal component analyses for samples using the electronic nose system revealed that the
increase of some volatile compounds during storage was rapid in sardine (Sardinops melanostictus), jack mackerel (Trachurus
japonicus), and chub mackerel (Scomber japonicus); moderate in yellowtail (Seriola quinqueradiata), skipjack (Katsuwonus
pelamis), and young oriental bluefin tuna (Thunnus thynnus).