The present study was conducted on an occasion that the unpleasant odor was found in a marine aquaculture fish served in restaurant. The identification of odor compound was conducted using Gas Chromatography-Olfactometry (GC-O) and odor compounds database. GC-O analysis and database search could estimate the odor compound as 2-methylisoborneol (2-MIB). No previous research has been reported that 2-MIB was detected from marine fish because 2-MIB is the compound produced by a type of algae and actinomycetes in fresh water pond and lake. A likely reason for 2-MIB detection from marine fish was that the water filtration device in aquarium which kept the fish was contaminated by 2-MIB. This case was accidental food contamination by natural chemicals analogous to mycotoxins.
