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Abstract
In 2015, the Lake Superior fish community was sampled with daytime bottom trawls at 76 nearshore and 33 offshore stations. Spring and summer water temperatures in 2015 were colder than average, but warmer than that observed in 2014. In the nearshore zone, a total of 11,882 individuals from 22 species or morphotypes were collected. Nearshore lakewide mean biomass was 1.8 kg/ha, which was near the lowest biomass on record for this survey since it began in 1978. In the offshore zone, a total 12,433 individuals from 8 species or morphotypes were collected lakewide. Offshore lakewide mean biomass was 5.9 kg/ha. The mean of the four previous years was 7.1 kg/ha. The abundance of age-1 Cisco was 14.3 fish/ha which was similar to that measured in 2009. We collected larval Coregonus in surface trawls at 94 locations and estimated a nearshore lakewide average density of 1,459 fish/ha which was nearly twice that measured in 2014.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | Other Report |
| Title | Status and trends in the Lake Superior fish community, 2015 |
| Year Published | 2016 |
| Language | English |
| Publisher | U.S. Geological Survey, Great Lakes Science Center |
| Contributing office(s) | Great Lakes Science Center |
| Description | 11 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, 2015 |
| First page | 10 |
| Last page | 20 |
| Country | Canada, United States |
| Other Geospatial | Lake Superior |
| Google Analytic Metrics | Metrics page |