Pat Mazik, PhD (Former Employee)
Science and Products
Filter Total Items: 24
The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and precocious maturation of early-rearing Atlantic salmon Salmo salar The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and precocious maturation of early-rearing Atlantic salmon Salmo salar
Swimming exercise, typically measured in body-lengths per second (BL/s), and dissolved oxygen (DO), are important environmental variables in fish culture. While there is an obvious physiological association between these two parameters, their interaction has not been adequately studied in Atlantic salmon Salmo salar. Because exercise and DO are variables that can be easily manipulated in...
Authors
Thomas Waldrop, Steven T. Summerfelt, Patricia M. Mazik, Christopher Good
Micronuclei and other erythrocyte nuclear abnormalities in fishes from the Great Lakes Basin, USA Micronuclei and other erythrocyte nuclear abnormalities in fishes from the Great Lakes Basin, USA
Biological markers (biomarkers) sensitive to genotoxic and mutagenic contamination in fishes are widely used to identify exposure effects in aquatic environments. The micronucleus assay was incorporated into a suite of indicators to assess exposure to genotoxic and mutagenic contamination at five Great Lakes Areas of Concern (AOCs), as well as one non-AOC (reference) site. The assay...
Authors
Ryan P. Braham, Vicki S. Blazer, Cassidy H. Shaw, Patricia M. Mazik
Transcriptome discovery in non-model wild fish species for the development of quantitative transcript abundance assays Transcriptome discovery in non-model wild fish species for the development of quantitative transcript abundance assays
Environmental studies increasingly identify the presence of both contaminants of emerging concern (CECs) and legacy contaminants in aquatic environments; however, the biological effects of these compounds on resident fishes remain largely unknown. High throughput methodologies were employed to establish partial transcriptomes for three wild-caught, non-model fish species; smallmouth bass
Authors
Cassidy M. Hahn, Luke R. Iwanowicz, Robert S. Cornman, Patricia M. Mazik, Vicki S. Blazer
Impact of carbon dioxide level, water velocity, and feeding regimen on growth and fillet attributes of cultured rainbow trout (Oncorhynchus mykiss) Impact of carbon dioxide level, water velocity, and feeding regimen on growth and fillet attributes of cultured rainbow trout (Oncorhynchus mykiss)
Production and management variables such as carbon dioxide (CO2) level, water velocity, and feeding frequency influence the growth and fillet attributes of rainbow trout (Oncorhynchus mykiss), as well as cost of production. More information is needed to determine the contributions of these variables to growth and fillet attributes to find the right balance between input costs and fish...
Authors
Patricia M. Mazik, P. M. Mazik, P. B. Kenney, J.T Silverstein
Assessment of general health of fishes collected at selected sites in the Great Lakes Basin In 2012 Assessment of general health of fishes collected at selected sites in the Great Lakes Basin In 2012
During the past decade, there has been a substantive increase in the detection of “emerging contaminants”, defined as a new substance, chemical, or metabolite in the environment; or a legacy substance with a newly expanded distribution, altered release, or a newly recognized effect (such as endocrine disruption). Emerging contaminants include substances such as biogenic hormones (human...
Authors
Patricia M. Mazik, Ryan P. Braham, Cassidy M. Hahn, Vicki Blazer
River mainstem thermal regimes influence population structuring within an Appalachian brook trout population River mainstem thermal regimes influence population structuring within an Appalachian brook trout population
Brook trout (Salvelinus fontinalis) often exist as highly differentiated populations, even at small spatial scales, due either to natural or anthropogenic sources of isolation and low rates of dispersal. In this study, we used molecular approaches to describe the unique population structure of brook trout inhabiting the Shavers Fork watershed, located in eastern West Virginia, and...
Authors
Aaron W. Aunins, J. Todd Petty, Tim L. King, Mariya Schilz, Patricia M. Mazik
Assessment of the fish tumor beneficial use impairment in brown bullhead (Ameiurus nebulosus) at selected Great Lakes Areas of Concern Assessment of the fish tumor beneficial use impairment in brown bullhead (Ameiurus nebulosus) at selected Great Lakes Areas of Concern
A total of 878 adult Brown Bullhead were collected at 11 sites within the Lake Erie and Lake Ontario drainages from 2011 to 2013. The sites included seven Areas of Concern (AOC; 670 individuals), one delisted AOC (50 individuals) and three non-AOC sites (158 individuals) used as reference sites. These fish were used to assess the “fish tumor or other deformities” beneficial use...
Authors
Vicki Blazer, Patricia M. Mazik, Luke R. Iwanowicz, Ryan P. Braham, Cassidy M. Hahn, Heather L. Walsh, Adam J. Sperry
Monitoring of wild fish health at selected sites in the Great Lakes Basin: methods and preliminary results Monitoring of wild fish health at selected sites in the Great Lakes Basin: methods and preliminary results
During fall 2010 and spring 2011, a total of 119 brown bullhead (Ameiurus nebulosus), 136 white sucker (Catostomus commersoni), 73 smallmouth bass (Micropterus dolomieu), and 59 largemouth bass (M. salmoides) were collected from seven Great Lakes Basin Areas of Concern and one Reference Site. Comprehensive fish health assessments were conducted in order to document potential adverse...
Authors
Vicki Blazer, Patricia M. Mazik, Luke R. Iwanowicz, Ryan Braham, Cassidy Hahn, Heather L. Walsh, Adam Sperry
The temperature-productivity squeeze: Constraints on brook trout growth along an Appalachian river continuum The temperature-productivity squeeze: Constraints on brook trout growth along an Appalachian river continuum
We tested the hypothesis that brook trout growth rates are controlled by a complex interaction of food availability, water temperature, and competitor density. We quantified trout diet, growth, and consumption in small headwater tributaries characterized as cold with low food and high trout density, larger tributaries characterized as cold with moderate food and moderate trout density...
Authors
J. Todd Petty, David Thorne, Brock M. Huntsman, Patricia M. Mazik
Brook trout movement in response to temperature, flow, and thermal refugia within a complex Appalachian riverscape Brook trout movement in response to temperature, flow, and thermal refugia within a complex Appalachian riverscape
We quantified movements of brook trout Salvelinus fontinalis and brown trout Salmo trutta in a complex riverscape characterized by a large, open-canopy main stem and a small, closed-canopy tributary in eastern West Virginia, USA. Our objectives were to quantify the overall rate of trout movement and relate movement behaviors to variation in streamflow, water temperature, and access to...
Authors
J. Todd Petty, Jeff L. Hansbarger, Brock M. Huntsman, Patricia M. Mazik
Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects
A high prevalence of intersex or testicular oocytes (TO) in male smallmouth bass within the Potomac River drainage has raised concerns as to the health of the river. Studies were conducted to document biomarker responses both temporally and spatially to better understand the influence of normal physiological cycles, as well as water quality and land-use influences. Smallmouth bass were...
Authors
Vicki Blazer, Luke R. Iwanowicz, Holly Henderson, Patricia M. Mazik, Jill A. Jenkins, David A. Alvarez, John A. Young
Microhabitat use by brook trout inhabiting small tributaries and a large river main stem: Implications for stream habitat restoration in the central Appalachians Microhabitat use by brook trout inhabiting small tributaries and a large river main stem: Implications for stream habitat restoration in the central Appalachians
Brook trout (Salvelinus fontinalis) habitat restoration is needed across a range of stream sizes; however, studies quantifying brook trout habitat preferences in streams of differing sizes are rare. We used radio-telemetry to quantify adult brook trout microhabitat use in a central Appalachian watershed, the upper Shavers Fork of the Cheat River in eastern West Virginia. Our objectives...
Authors
Jeff L. Hansbarger, J. Todd Petty, Patricia M. Mazik
Non-USGS Publications**
Mazik, P.M., R. P. Braham, C. M. Hahn, and V.S. Blazer. 2015. Assessment of general and reproductive health of fishes at selected sites in the Great Lakes Basin in 2012. Department of Interior, Fish and Wildlife Service, Cooperator Science Series FWS/CSS-112-2015, Washington, D.C.
Aunins, A.W., J.T. Petty, T.L. King, M. Schilz and P.M Mazik, River mainstem thermal regimes influence population structuring within an appalachian brook trout population. Conserv Genet (2015) 16: 15. doi:10.1007/s10592-014-0636-6
Drew R. Ekman, Gerald T. Ankley, Vicki S. Blazer, Timothy W. Collette, Natàlia Garcia-Reyero, Luke R. Iwanowicz, Zachary G. Jorgenson, Kathy E. Lee, Pat M. Mazik, David H. Miller, Edward J. Perkins, Edwin T. Smith, Joseph E. Tietge and Daniel L. Villeneuve (2013). ENVIRONMENTAL REVIEWS AND CASE STUDIES: Biological Effects–Based Tools for Monitoring Impacted Surface Waters in the Great Lakes: A Multiagency Program in Support of the Great Lakes Restoration Initiative. Environmental Practice, 15, pp 409-426. doi:10.1017/S1466046613000458.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 24
The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and precocious maturation of early-rearing Atlantic salmon Salmo salar The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and precocious maturation of early-rearing Atlantic salmon Salmo salar
Swimming exercise, typically measured in body-lengths per second (BL/s), and dissolved oxygen (DO), are important environmental variables in fish culture. While there is an obvious physiological association between these two parameters, their interaction has not been adequately studied in Atlantic salmon Salmo salar. Because exercise and DO are variables that can be easily manipulated in...
Authors
Thomas Waldrop, Steven T. Summerfelt, Patricia M. Mazik, Christopher Good
Micronuclei and other erythrocyte nuclear abnormalities in fishes from the Great Lakes Basin, USA Micronuclei and other erythrocyte nuclear abnormalities in fishes from the Great Lakes Basin, USA
Biological markers (biomarkers) sensitive to genotoxic and mutagenic contamination in fishes are widely used to identify exposure effects in aquatic environments. The micronucleus assay was incorporated into a suite of indicators to assess exposure to genotoxic and mutagenic contamination at five Great Lakes Areas of Concern (AOCs), as well as one non-AOC (reference) site. The assay...
Authors
Ryan P. Braham, Vicki S. Blazer, Cassidy H. Shaw, Patricia M. Mazik
Transcriptome discovery in non-model wild fish species for the development of quantitative transcript abundance assays Transcriptome discovery in non-model wild fish species for the development of quantitative transcript abundance assays
Environmental studies increasingly identify the presence of both contaminants of emerging concern (CECs) and legacy contaminants in aquatic environments; however, the biological effects of these compounds on resident fishes remain largely unknown. High throughput methodologies were employed to establish partial transcriptomes for three wild-caught, non-model fish species; smallmouth bass
Authors
Cassidy M. Hahn, Luke R. Iwanowicz, Robert S. Cornman, Patricia M. Mazik, Vicki S. Blazer
Impact of carbon dioxide level, water velocity, and feeding regimen on growth and fillet attributes of cultured rainbow trout (Oncorhynchus mykiss) Impact of carbon dioxide level, water velocity, and feeding regimen on growth and fillet attributes of cultured rainbow trout (Oncorhynchus mykiss)
Production and management variables such as carbon dioxide (CO2) level, water velocity, and feeding frequency influence the growth and fillet attributes of rainbow trout (Oncorhynchus mykiss), as well as cost of production. More information is needed to determine the contributions of these variables to growth and fillet attributes to find the right balance between input costs and fish...
Authors
Patricia M. Mazik, P. M. Mazik, P. B. Kenney, J.T Silverstein
Assessment of general health of fishes collected at selected sites in the Great Lakes Basin In 2012 Assessment of general health of fishes collected at selected sites in the Great Lakes Basin In 2012
During the past decade, there has been a substantive increase in the detection of “emerging contaminants”, defined as a new substance, chemical, or metabolite in the environment; or a legacy substance with a newly expanded distribution, altered release, or a newly recognized effect (such as endocrine disruption). Emerging contaminants include substances such as biogenic hormones (human...
Authors
Patricia M. Mazik, Ryan P. Braham, Cassidy M. Hahn, Vicki Blazer
River mainstem thermal regimes influence population structuring within an Appalachian brook trout population River mainstem thermal regimes influence population structuring within an Appalachian brook trout population
Brook trout (Salvelinus fontinalis) often exist as highly differentiated populations, even at small spatial scales, due either to natural or anthropogenic sources of isolation and low rates of dispersal. In this study, we used molecular approaches to describe the unique population structure of brook trout inhabiting the Shavers Fork watershed, located in eastern West Virginia, and...
Authors
Aaron W. Aunins, J. Todd Petty, Tim L. King, Mariya Schilz, Patricia M. Mazik
Assessment of the fish tumor beneficial use impairment in brown bullhead (Ameiurus nebulosus) at selected Great Lakes Areas of Concern Assessment of the fish tumor beneficial use impairment in brown bullhead (Ameiurus nebulosus) at selected Great Lakes Areas of Concern
A total of 878 adult Brown Bullhead were collected at 11 sites within the Lake Erie and Lake Ontario drainages from 2011 to 2013. The sites included seven Areas of Concern (AOC; 670 individuals), one delisted AOC (50 individuals) and three non-AOC sites (158 individuals) used as reference sites. These fish were used to assess the “fish tumor or other deformities” beneficial use...
Authors
Vicki Blazer, Patricia M. Mazik, Luke R. Iwanowicz, Ryan P. Braham, Cassidy M. Hahn, Heather L. Walsh, Adam J. Sperry
Monitoring of wild fish health at selected sites in the Great Lakes Basin: methods and preliminary results Monitoring of wild fish health at selected sites in the Great Lakes Basin: methods and preliminary results
During fall 2010 and spring 2011, a total of 119 brown bullhead (Ameiurus nebulosus), 136 white sucker (Catostomus commersoni), 73 smallmouth bass (Micropterus dolomieu), and 59 largemouth bass (M. salmoides) were collected from seven Great Lakes Basin Areas of Concern and one Reference Site. Comprehensive fish health assessments were conducted in order to document potential adverse...
Authors
Vicki Blazer, Patricia M. Mazik, Luke R. Iwanowicz, Ryan Braham, Cassidy Hahn, Heather L. Walsh, Adam Sperry
The temperature-productivity squeeze: Constraints on brook trout growth along an Appalachian river continuum The temperature-productivity squeeze: Constraints on brook trout growth along an Appalachian river continuum
We tested the hypothesis that brook trout growth rates are controlled by a complex interaction of food availability, water temperature, and competitor density. We quantified trout diet, growth, and consumption in small headwater tributaries characterized as cold with low food and high trout density, larger tributaries characterized as cold with moderate food and moderate trout density...
Authors
J. Todd Petty, David Thorne, Brock M. Huntsman, Patricia M. Mazik
Brook trout movement in response to temperature, flow, and thermal refugia within a complex Appalachian riverscape Brook trout movement in response to temperature, flow, and thermal refugia within a complex Appalachian riverscape
We quantified movements of brook trout Salvelinus fontinalis and brown trout Salmo trutta in a complex riverscape characterized by a large, open-canopy main stem and a small, closed-canopy tributary in eastern West Virginia, USA. Our objectives were to quantify the overall rate of trout movement and relate movement behaviors to variation in streamflow, water temperature, and access to...
Authors
J. Todd Petty, Jeff L. Hansbarger, Brock M. Huntsman, Patricia M. Mazik
Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects
A high prevalence of intersex or testicular oocytes (TO) in male smallmouth bass within the Potomac River drainage has raised concerns as to the health of the river. Studies were conducted to document biomarker responses both temporally and spatially to better understand the influence of normal physiological cycles, as well as water quality and land-use influences. Smallmouth bass were...
Authors
Vicki Blazer, Luke R. Iwanowicz, Holly Henderson, Patricia M. Mazik, Jill A. Jenkins, David A. Alvarez, John A. Young
Microhabitat use by brook trout inhabiting small tributaries and a large river main stem: Implications for stream habitat restoration in the central Appalachians Microhabitat use by brook trout inhabiting small tributaries and a large river main stem: Implications for stream habitat restoration in the central Appalachians
Brook trout (Salvelinus fontinalis) habitat restoration is needed across a range of stream sizes; however, studies quantifying brook trout habitat preferences in streams of differing sizes are rare. We used radio-telemetry to quantify adult brook trout microhabitat use in a central Appalachian watershed, the upper Shavers Fork of the Cheat River in eastern West Virginia. Our objectives...
Authors
Jeff L. Hansbarger, J. Todd Petty, Patricia M. Mazik
Non-USGS Publications**
Mazik, P.M., R. P. Braham, C. M. Hahn, and V.S. Blazer. 2015. Assessment of general and reproductive health of fishes at selected sites in the Great Lakes Basin in 2012. Department of Interior, Fish and Wildlife Service, Cooperator Science Series FWS/CSS-112-2015, Washington, D.C.
Aunins, A.W., J.T. Petty, T.L. King, M. Schilz and P.M Mazik, River mainstem thermal regimes influence population structuring within an appalachian brook trout population. Conserv Genet (2015) 16: 15. doi:10.1007/s10592-014-0636-6
Drew R. Ekman, Gerald T. Ankley, Vicki S. Blazer, Timothy W. Collette, Natàlia Garcia-Reyero, Luke R. Iwanowicz, Zachary G. Jorgenson, Kathy E. Lee, Pat M. Mazik, David H. Miller, Edward J. Perkins, Edwin T. Smith, Joseph E. Tietge and Daniel L. Villeneuve (2013). ENVIRONMENTAL REVIEWS AND CASE STUDIES: Biological Effects–Based Tools for Monitoring Impacted Surface Waters in the Great Lakes: A Multiagency Program in Support of the Great Lakes Restoration Initiative. Environmental Practice, 15, pp 409-426. doi:10.1017/S1466046613000458.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.