Status and trends in the Lake Superior fish community, 2014

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Abstract

In 2014, the Lake Superior fish community was sampled with daytime bottom trawls at 73 nearshore and 30 offshore stations. Spring and summer water temperatures were the coldest measured for the period of records for the surveys. In the nearshore zone, a total of 15,372 individuals from 28 species or morphotypes were collected. Nearshore lakewide mean biomass was 6.9 kg/ha, which was higher than that observed in the past few years, but below the long-term average of 9.2 kg/ha. In the offshore zone, a total 12,462 individuals from 11 species were collected lakewide. Offshore lakewide mean biomass was 6.6 kg/ha. The mean of the three previous years was 8.6 kg/ha. We collected larval Coregonus in surface trawls at 94 locations and estimated a lakewide average density of 577 fish/ha with a total lakewide population estimate of 14.2 billion (standard error + 30 million).

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Additional publication details

Publication type Report
Publication Subtype Other Government Series
Title Status and trends in the Lake Superior fish community, 2014
Year Published 2015
Language English
Publisher U.S. Geological Survey, Great Lakes Science Center
Contributing office(s) Great Lakes Science Center
Description 10 p.
Larger Work Type Report
Larger Work Subtype USGS Unnumbered Series
Larger Work Title Compiled reports to the Great Lakes Fishery Commission of the annual bottom trawl and acoustics surveys, 2014
First page 41
Last page 50
Country Canada, United States
Other Geospatial Lake Superior