Undesirable odour substances (geosmin and 2-methylisoborneol) in water environment: Sources, impacts and removal strategies. (May 2022)

• Record Type: Journal Article
• Authors: Abd El-Hack, Mohamed E.; El-Saadony, Mohamed T.; Elbestawy, Ahmed R.; Ellakany, Hany F.; Abaza, Samar S.; Geneedy, Amr M.; Salem, Heba M.; Taha, Ayman E.; Swelum, Ayman A.; Omer, Fatima A.; AbuQamar, Synan F.; El-Tarabily, Khaled A.
• Is Part Of: Marine pollution bulletin. Volume 178(2022)
• Publication Date: 2022-05
• Subjects: 2-methylisoborneol -- Actinobacteria -- Aquaculture system -- Fish quality -- Geosmin -- Off-flavour -- Water pollution; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2022.113579
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: Off-flavours in fish products generated from recirculating aquaculture systems (RAS) are a major problem in the fish farming industry affecting the market demand and prices. A particular concern is the muddy or musty odour and taste in fish due to the presence of secondary metabolites geosmin and 2-methylisoborneol (2-MIB), produced by actinobacteria (mainly Streptomyces ), myxobacteria and cyanobacteria. Off-flavours have deteriorated the quality of fish, rendering their products unfit for human consumption. The process of odour removal requires purification for several days to weeks in clean water; thus this leads to additional production costs. Geosmin and 2-MIB, detected at extremely low odour thresholds, are the most widespread off-flavour metabolites in aquaculture, entering through fish gills and accumulating in the fish adipose tissues. In this review, we aimed to determine the diversity and identity of geosmin- and 2-MIB-producing bacteria in aquaculture and provide possible strategies for their elimination. Highlights: Off-flavours are a major problem in the aquaculture industry. Off-flavours lead to deterioration of fish. Geosmin and 2-methylisoborneol appear the most widespread off-flavour metabolite in aquaculture.