Earthy-Musty Odor-Producing Cyanophytes Isolated from Five Water Areas in Tokyo

Abstract

Two kinds of 2-methylisoborneol-producing blue-green algae, Oscillatoriageminata and O.limnetica, and three kinds of geosmin-producing algae, O.amoena, O.splendida, and Aphanizomenonflos-aquae, were isolated from a park pond, a fish-cultivation pond, a river, and a reservoir. An oscillatorian species isolated from an air conditioning cooling tower was shown to yield both 2-methylisoborneol and geosmin simultaneously. Care was taken to ensure that the blue-green algae identified were those responsible for the musty odor compounds.

The management of undesirable cyanobacteria blooms in channel catfish ponds using a constructed wetland: Contribution to the control of off-flavor occurrences

“…In particular, Oscillatoria sp., Oscillatoria kawamurae and Microcystis aeruginosa were found to correlate with the occurrence of MIB, geosmin and b-cyclocitral in the pond water. The correlations were consistent with previous studies (Matsumoto and Tsuchiya, 1988;Jü ttner, 1995;Tucker, 2000) that attributed the prevalence of MIB, geosmin and bcyclocitral to the occurrence of certain Oscillatoria and Microcystis species. The average density of Microcystis and Oscillatoria species accounted for more than 70% of the total algal density, and M. aeruginosa was the dominant species in the control pond.…”

“…Certain species of cyanobacteria are known to be responsible for the occurrence of off-flavor compounds (2-methylisoborneol (MIB), geosmin and b-cyclocitral) in water bodies, including species from the genera Oscillatoria (Matsumoto and Tsuchiya, 1988), Anabaena (Rosen et al, 1992), Microcystis (Jü ttner et al, 2010), Phormidium (Izaguirre, 1992), Lyngbya (Schrader and Blevins, 1993), and Pseudanabaena (Izaguirre and Taylor, 1998), imparting an undesirable earthy, musty, or muddy flavor to the fish.…”

“…Because the off-flavors most frequently encountered in aquaculture have been linked to the presence of odor-producing cyanobacteria (Matsumoto and Tsuchiya, 1988;Jü ttner, 1995;Tucker, 2000), such preventive measures as the application of algaecides (Schrader et al, 2005), bio-manipulation using filterfeeding fish (Tucker, 2006) and other preventive measures have been taken to control or eliminate such groups of organisms.…”

Biochemical and Ecological Control of Geosmin and 2-Methylisoborneol in Source Waters

“…As noted above, cyanobacteria are considered to be the major sources of geosmin and 2-MIB in aquatic environments where photosynthetic growth is possible (31,45,53,65,110). More than 200 studies have made considerable advances in our knowledge of the biochemistry, taxonomy and ecology of some of the cyanobacteria which produce these VOCs.…”

Effet des efflorescences d’Anabaena spp. sur la qualité organoleptique de la truite arc-en ciel (Onchorynchus mykiss)

“…Des études ont démontré la relation entre la présence d'Anabaena et la production de molécules odorantes en Asie et en Amérique (MATSUMOTO et TSUCHIYA, 1988; VAN DER PLOEG et al,1992), mais peu de travaux récents concernent l'Europe. Dans la majorité des cas, les défauts de goût de type « terreuxmoisi » sont liés à l'apparition de géosmine.…”