Experimental validation of geosmin uptake in rainbow trout,Oncorhynchus mykiss (Waldbaum) suggests biotransformation |
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| Authors: | Edward Schram Johan W Schrama Tobias van Kooten Christiaan J A F Kwadijk Harm Kampen Jan W van de Heul Johan A J Verreth Albertinka J Murk |
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| Affiliation: | 1. Wageningen Marine Research, Wageningen University & Research, IJmuiden, The Netherlands;2. Aquaculture and Fisheries Group, Wageningen University & Research, Wageningen, The Netherlands;3. Marine Animal Ecology Group, Wageningen University & Research, Wageningen, The Netherlands |
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| Abstract: | The bioconcentration of waterborne geosmin in rainbow trout, Oncorhynchus mykiss (Waldbaum) was assessed. Fifty rainbow trout with a mean (SD) weight of 226.6 (29.0) g and lipid content of 6.2 (0.6) % (w/w) were exposed to geosmin in static water for 0, 2, 4, 6, 8, 12, 24, 36, 48 and 120 hr, with one tank containing five fish for each exposure period. Geosmin concentrations were measured in fish tissue and water samples collected over time. With time the geosmin concentration in the fish increased and decreased in the water. However, the total absolute amount of geosmin in the system declined over time which could be explained by induction of biotransformation. This is in accordance with the decreasing lipid normalized geosmin levels in the liver compared with the liver‐free carcass. Geosmin distribution within rainbow trout clearly is not exclusively governed by the lipid content of tissues. In vivo geosmin bioconcentration in rainbow trout is slower and the body burden reached is lower than the generally accepted theoretical model predicts. |
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| Keywords: | bioconcentration biotransformation geosmin off‐flavour rainbow trout water‐lipid partitioning |
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