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Acoustic and mid-water trawl estimates of bloater age-0 numeric density (fish/ha; left panel) and age-1+ biomass (kg/ha; right panel) in Lake Huron, 1997-2015. Error bars represent ±1 standard error. Emerald shiner – In 2015, emerald shiner biomass increased from 2014 estimates and was 24% of the long-term mean of 0.10 kg/ha (Figure 5). Mean biomass of emerald shiner was estimated to be < 0.01 % of total pelagic fish biomass in 2014, but increased to 0.22 % of total biomass in 2015. Emerald shiner biomass averaged 1.6% of total fish biomass during 2004-2014, but with the exception of 2006, rarely exceeded 1% of total fish biomass in a given year.  

Acoustic and mid-water trawl estimates of bloater age-0 numeric density (fish/ha; left panel) and age-1+ biomass (kg/ha; right panel) in Lake Huron, 1997-2015. Error bars represent ±1 standard error. Emerald shiner – In 2015, emerald shiner biomass increased from 2014 estimates and was 24% of the long-term mean of 0.10 kg/ha (Figure 5). Mean biomass of emerald shiner was estimated to be < 0.01 % of total pelagic fish biomass in 2014, but increased to 0.22 % of total biomass in 2015. Emerald shiner biomass averaged 1.6% of total fish biomass during 2004-2014, but with the exception of 2006, rarely exceeded 1% of total fish biomass in a given year.  

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Technical Report
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The USGS Great Lakes Science Center has conducted integrated acoustic and mid-water trawl surveys of Lake Huron during 1997 and annually from 2004-2015. The 2015 survey was conducted during September and included transects in Lake Huron's main basin, Georgian Bay, and North Channel. Mean lake-wide total pelagic fish density was 1,313 fish/ha and me...

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