Lake Superior Lakewide Fish Community Trends. U.S. Geological Survey Lake Superior Biological Station Ashland, Wisconsin
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1 Lake Superior Lakewide Fish Community Trends U.S. Geological Survey Lake Superior Biological Station Ashland, Wisconsin
2 213 Lake Superior Fish Surveys 1. What is the composition of the sample? Measure Nearshore Offshore A. Species D. Age Dates 19 May-19 June 7-21 July B. Abundance E. Size Trawl sites Fish species C. Biomass F. Diet Individual fish 23,432 2, What was the distribution of the 213 samples? Mean biomass (kg/ha) How does the 213 sample compare to previous years?
3 213 Lake Superior Fish Surveys 1. What is the composition of the sample? A. Species D. Age Yearclass strength B. Abundance E. Size C. Biomass F. Diet 2. What was the distribution of the 213 samples? 3. How does the 213 sample compare to previous years?
4 213 Survey conditions Depth (m) Water temperature (C) USGS Lake Superior, mean temperatures during the survey
5 213 Survey conditions Depth (m) Water temperature (C) Mean, USGS Lake Superior, mean temperatures during the nearshore survey
6 Corrected water temperature (C) Long-term warming trends, during nearshore survey, May-June Surface 2 m 5 m Depth (m) Warming (degrees C per year) p<.25 Non-significant 3 1 m USGS Lake Superior water temperatures during the nearshore survey period
7 Fish species at each site Not sampled 26 species overall 4 non-native, 1 common - RBS USGS Lake Superior trawling
8 Fish species collections over time Total number of fish species per 15, individuals On average, 1 more species every 5 years Native Invasive Exotic Offshore USGS Lake Superior trawling
9 Community composition, 213 v. long-term mean Lake Whitefish Cisco Bloater Rainbow Smelt Lean Lake Trout Hatchery Lake Trout Siscowet Lake Trout Burbot Sculpin other fish Shortjaw Cisco Pygmy Whitefish Trout-perch Ninespine Stickleback Kiyi % of Total community biomass 213 Long-term USGS Lake Superior nearshore trawling
10 Propotion of sites Distribution of total fish biomass among stations in How What does was the 213 distribution sample of compare the 213 to samples? previous years? lakewide mean 5.5 kg per ha Long-term lakewide mean 8.8 kg per ha Biomass (kg per ha) USGS Lake Superior nearshore trawling
11 Propotion of sites Distribution of total fish biomass among stations in What was the distribution of the 213 samples? Lakewide mean 5.5 kg per ha Not sampled Biomass (kg per ha) USGS Lake Superior nearshore trawling
12 Total fish biomass, skewness over time Skewness 1 3. How does the 213 sample compare to previous years? Long-term mean USGS Lake Superior nearshore trawling
13 Distribution of total fish biomass among stations, 213 v. long-term mean Not sampled Long-term mean USGS Lake Superior nearshore trawling
14 Mean lakewide total fish biomass Mean biomass (kg per ha) Long-term mean 8.8 kg per ha 5 USGS Lake Superior nearshore trawling
15 Maximum annual total biomass (kg per ha) Maximum annual total biomass at a station Mean biomass (Kg per ha) Long-term mean 115 kg per ha 1 5 USGS Lake Superior nearshore trawling
16 Mean annual biomass Mean v. maximum annual lakewide total fish biomass R² = Maximum annual biomass USGS Lake Superior nearshore trawling
17 Mean biomass (Kg per ha) Median lakewide total fish biomass Median biomass (kg per ha) Long-term median 1.8 kg per ha USGS Lake Superior nearshore trawling
18 Mean annual biomass Mean Kg per ha Median Mean v. median annual lakewide total fish biomass 2 Mean Median R² = Median annual biomass USGS Lake Superior nearshore trawling
19 Total fish biomass, long term trends within sites Mean Kg per ha Median 2 Mean Median Significant decrease, p<.1, 35 sites Significant increase, p<.1, 1 site Non-significant trend, 48 sites USGS Lake Superior nearshore trawling, log transformed data
20 Biomass (kg per ha) Bloater Long term mean 1.8 kg per ha USGS Lake Superior nearshore trawling
21 Bloater, recruitment Density (number per ha) USGS Lake Superior nearshore trawling, bloater < 13 mm
22 Biomass kg per ha Cisco Long term mean 2.6 kg per ha USGS Lake Superior nearshore trawling
23 Cisco, recruitment Density (number per ha) USGS Lake Superior nearshore trawling, cisco < 14 mm
24 Lake Whitefish Biomass (kg per ha) Long term mean 2.1 kg per ha USGS Lake Superior nearshore trawling
25 Lake Whitefish, recruitment Density (number per ha) Long term mean 8 fish per ha 1 USGS Lake Superior nearshore trawling, lake whitefish < 16 mm
26 Biomass (kg per ha) Rainbow Smelt Long-term mean 1.2 kg per ha USGS Lake Superior nearshore trawling
27 Density (number per ha) Rainbow Smelt, recruitment Long-term mean 165 fish per ha 2 1 USGS Lake Superior nearshore trawling, rainbow smelt < 1 mm
28 Rainbow Smelt, lack of older age classes Percent of population USGS Lake Superior nearshore trawling, % of rainbow smelt >155 mm, ca. age-3
29 Sculpin Biomass (kg per ha) Long-term mean.6 kg per ha USGS Lake Superior nearshore trawling
30 % of total biomass Biomass (kg per ha) Sculpin % 9% 8% 7% 6% 5% 4% 3% 2% 1% % Slimy Spoonhead Deepwater USGS Lake Superior nearshore bottom trawling
31 Biomass (kg per ha) Other prey species Ninespine Stickleback Trout-perch Shortjaw Cisco Kiyi Pygmy Whitefish Round Whitefish Long-term mean.44 kg per ha.5 USGS Lake Superior nearshore trawling
32 % of total biomass Biomass (kg per ha) Lake Trout 2 1 1% 9% 8% 7% 6% 5% 4% 3% 2% 1% % Lean Siscowet Hatchery USGS Lake Superior nearshore bottom trawling
33 Hatchery Lake Trout Biomass (kg per ha) USGS Lake Superior nearshore bottom trawling
34 Lean Lake Trout Biomass (kg per ha) Long-term mean.36 kg per ha USGS Lake Superior nearshore bottom trawling
35 Lean Lake Trout, juveniles Density (number per ha) Long-term mean.6 fish per ha.5 USGS Lake Superior nearshore trawling, lean lake trout < 226 mm, ~3 years
36 Siscowet Lake Trout Biomass (kg per ha) Long term mean.1 kg per ha USGS Lake Superior nearshore bottom trawling
37 Siscowet Lake Trout, juveniles Density (number per ha) Long-term mean.6 fish per ha.1.5 USGS Lake Superior nearshore trawling, lean lake trout < 226 mm, ~3 years
38 213 Offshore Fish Community Survey Measure Offshore Dates 7-21 July Trawl sites 35 Miles trawled 31 Fish species 13 Individual fish 2,371 Total biomass (kg) 346 Mean biomass (kg/ha) 8.9 USGS Lake Superior offshore trawling, 35 sites >1 m
39 Proportion of sites Propotion of sites Distribution of total fish biomass among stations in Lakewide mean 8.9 kg per ha 37% of sites >mean Nearshore Biomass (kg per ha) Biomass (kg per ha) USGS Lake Superior offshore trawling, >1 m
40 Total offshore fish biomass by station in 213 Mean biomass, 8.9 kg per ha Kiyi Siscowet Deepwater Sculpin Other USGS Lake Superior offshore trawling, >1 m
41 Mean biomass (kg per ha) Offshore fish biomass by depth Kiyi Siscowet Deepwater Sculpin Other Bathymetric depth (m) USGS Lake Superior offshore trawling, >1 m
42 Biomass (kg per ha) Biomass (kg per ha) Biomass (kg per ha) Biomass (kg per ha) Offshore fish biomass All fish Nearshore Deepwater Sculpin Kiyi Siscowet Lake Trout All Lake Trout USGS Lake Superior offshore trawling, >1 m
43 Summary Nearshore Biomass slight upward trend no where else to go In 213, upswing due largely to Lake Whitefish, Rainbow Smelt, other preyfish, and Lean and Siscowet Lake Trout Continued absence of age-1 Cisco and Bloater Siscowet continue to increase in nearshore areas Offshore Biomass dominated by Deepwater Sculpin, Kiyi, and Siscowet Biomass similar among the past three years for all species
44 24 March 214
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