Distribution of niclosamide following granular Bayer applications in lentic environments

Project Completion Report
By: , and 



Temporal and spatial distribution of niclosamide in the water column and sediment were evaluated after the application of granular Bayluscide in six lentic sea lamprey (Petromyzon marinus) larval assessment plots. Water and sediment were collected 0.25, 1, 3, 5, and 7 hours after application and were analyzed for niclosamide, the active ingredient in granular Bayluscide. Water samples were collected from five heights in the water column (1 cm, 13 cm, 26 cm, 1/2 water column, and water surface) at five locations inside and four locations 10 m outside of each assessment plot. Sediment was collected from 18 locations within each plot. Niclosamide water concentrations inside and outside of the plots did not vary by depth but did vary between plots and by time. Niclosamide water concentrations also varied by sampler location outside of the plots. Following granular Bayluscide applications the mean niclosamide concentration in water for all levels, within the plots, decreased from 0.12 mgL-1 (SD = 0.12 mgL-1) at 15 minutes to 0.061 mgL-1 (SD = 0.040 mgL-1) at hour 1. The mean niclosamide concentration in the top 4 cm of sediment was 2.9 mgkg-1 (SD = 2.4 mgkg-1) 15 minutes after application and was 1.3 mgkg-1 (SD = 1.8 mgkg-1) at hour 7. Concentrations in all sediment samples ranged from < 0.001 to 30.730 mgkg-1 and varied between the six plots. Niclosamide concentrations measured in sediment samples were more than 1 order of magnitude greater than in the water and varied spatially by over 4 orders of magnitude.

Study Area

Publication type Report
Publication Subtype Organization Series
Title Distribution of niclosamide following granular Bayer applications in lentic environments
Series title Project Completion Report
Year Published 2020
Language English
Publisher Great Lakes Fishery Commission
Contributing office(s) Upper Midwest Environmental Sciences Center
Description 30 p.
Country United States
State Michigan, Wisconsin
County Mackinac County, Marinette County
Other Geospatial Hog Island Creek, Lake Michigan, Peshtigo Harbor
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