Jean V Adams, PhD (Former Employee)
Science and Products
Filter Total Items: 80
Factors affecting bottom trawl catches: Implications for monitoring the fishes of Lake Superior Factors affecting bottom trawl catches: Implications for monitoring the fishes of Lake Superior
An annual daytime bottom trawl survey of the Lake Superior fish community designed in 1978 does not adequately assess the entire community. Whereas recent studies have recommended that pelagic species be surveyed with a combination of acoustic and midwater trawling methods (AC-MT), we used bottom trawling to study the effects of depth, diel period, and season on biomass estimates and the...
Authors
D.L. Yule, J.V. Adams, J.D. Stockwell, O. T. Gorman
Shell-free biomass and population dynamics of dreissenids in offshore Lake Michigan, 2001-2003 Shell-free biomass and population dynamics of dreissenids in offshore Lake Michigan, 2001-2003
The USGS-Great Lakes Science Center has collected dreissenid mussels annually from Lake Michigan since zebra mussels (Dreissena polymorpha) became a significant portion of the bottom-trawl catch in 1999. For this study, we investigated dreissenid distribution, body mass, and recruitment at different depths in Lake Michigan during 2001-2003. The highest densities of dreissenid biomass...
Authors
J. R. P. French, J.V. Adams, J. Craig, R.G. Stickel, S. J. Nichols, G.W. Fleischer
Temporal trends of young-of-year fishes in Lake Erie and comparison of diel sampling periods Temporal trends of young-of-year fishes in Lake Erie and comparison of diel sampling periods
We explored temporal trends of young-of-year (YOY) fishes caught in bottom trawl hauls at an established offshore monitoring site in Lake Erie in fall during 1961–2001. Sampling was conducted during morning, afternoon, and night in each year. Catches per hour (CPH) of alewife (Alosa pseudoharengus) YOY were relatively low and exhibited no temporal trend. This result was consistent with...
Authors
M.A. Stapanian, M.T. Bur, J.V. Adams
Vertical distribution of fish biomass in Lake Superior: Implications for day bottom trawl surveys Vertical distribution of fish biomass in Lake Superior: Implications for day bottom trawl surveys
Evaluation of the biases in sampling methodology is essential for understanding the limitations of abundance and biomass estimates of fish populations. Estimates from surveys that rely solely on bottom trawls may be particularly vulnerable to bias if pelagic fish are numerous. We evaluated the variability in the vertical distribution of fish biomass during the U.S. Geological Survey's...
Authors
J.D. Stockwell, D.L. Yule, T.R. Hrabik, J.V. Adams, O. T. Gorman, B.V. Holbrook
Using multiple gears to assess acoustic detectability and biomass of fish species in lake superior Using multiple gears to assess acoustic detectability and biomass of fish species in lake superior
Recent predator demand and prey supply studies suggest that an annual daytime bottom trawl survey of Lake Superior underestimates prey fish biomass. A multiple-gear (acoustics, bottom trawl, and midwater trawl) nighttime survey has been recommended, but before abandoning a long-term daytime survey the effectiveness of night sampling of important prey species must be verified. We sampled...
Authors
D.L. Yule, J.V. Adams, J.D. Stockwell, O. T. Gorman
Science and Products
Filter Total Items: 80
Factors affecting bottom trawl catches: Implications for monitoring the fishes of Lake Superior Factors affecting bottom trawl catches: Implications for monitoring the fishes of Lake Superior
An annual daytime bottom trawl survey of the Lake Superior fish community designed in 1978 does not adequately assess the entire community. Whereas recent studies have recommended that pelagic species be surveyed with a combination of acoustic and midwater trawling methods (AC-MT), we used bottom trawling to study the effects of depth, diel period, and season on biomass estimates and the...
Authors
D.L. Yule, J.V. Adams, J.D. Stockwell, O. T. Gorman
Shell-free biomass and population dynamics of dreissenids in offshore Lake Michigan, 2001-2003 Shell-free biomass and population dynamics of dreissenids in offshore Lake Michigan, 2001-2003
The USGS-Great Lakes Science Center has collected dreissenid mussels annually from Lake Michigan since zebra mussels (Dreissena polymorpha) became a significant portion of the bottom-trawl catch in 1999. For this study, we investigated dreissenid distribution, body mass, and recruitment at different depths in Lake Michigan during 2001-2003. The highest densities of dreissenid biomass...
Authors
J. R. P. French, J.V. Adams, J. Craig, R.G. Stickel, S. J. Nichols, G.W. Fleischer
Temporal trends of young-of-year fishes in Lake Erie and comparison of diel sampling periods Temporal trends of young-of-year fishes in Lake Erie and comparison of diel sampling periods
We explored temporal trends of young-of-year (YOY) fishes caught in bottom trawl hauls at an established offshore monitoring site in Lake Erie in fall during 1961–2001. Sampling was conducted during morning, afternoon, and night in each year. Catches per hour (CPH) of alewife (Alosa pseudoharengus) YOY were relatively low and exhibited no temporal trend. This result was consistent with...
Authors
M.A. Stapanian, M.T. Bur, J.V. Adams
Vertical distribution of fish biomass in Lake Superior: Implications for day bottom trawl surveys Vertical distribution of fish biomass in Lake Superior: Implications for day bottom trawl surveys
Evaluation of the biases in sampling methodology is essential for understanding the limitations of abundance and biomass estimates of fish populations. Estimates from surveys that rely solely on bottom trawls may be particularly vulnerable to bias if pelagic fish are numerous. We evaluated the variability in the vertical distribution of fish biomass during the U.S. Geological Survey's...
Authors
J.D. Stockwell, D.L. Yule, T.R. Hrabik, J.V. Adams, O. T. Gorman, B.V. Holbrook
Using multiple gears to assess acoustic detectability and biomass of fish species in lake superior Using multiple gears to assess acoustic detectability and biomass of fish species in lake superior
Recent predator demand and prey supply studies suggest that an annual daytime bottom trawl survey of Lake Superior underestimates prey fish biomass. A multiple-gear (acoustics, bottom trawl, and midwater trawl) nighttime survey has been recommended, but before abandoning a long-term daytime survey the effectiveness of night sampling of important prey species must be verified. We sampled...
Authors
D.L. Yule, J.V. Adams, J.D. Stockwell, O. T. Gorman