Pat Mazik, PhD (Former Employee)
Science and Products
Filter Total Items: 24
Assessment of microscopic pathology in fishes collected at sites impacted by wood tar in Pennsylvania Assessment of microscopic pathology in fishes collected at sites impacted by wood tar in Pennsylvania
In an effort to determine whether fish populations in an area affected by wood tar waste exhibited health effects, fish were collected and analyzed with histopathology. Multiple species, including Mottled Sculpin (Cottus bairdii), Creek Chub (Semotilus atromaculatus), White Sucker (Catostumus commersonii), Redside Dace (Clinostomus elongatus), Common Shiner (Luxilus cornutus), and...
Authors
Heather L. Walsh, Vicki S. Blazer, Patricia M. Mazik, Adam J. Sperry, Diana Pavlick
The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and survival of rainbow trout Oncorhynchus mykiss The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and survival of rainbow trout Oncorhynchus mykiss
Swimming exercise and dissolved oxygen (DO) are important parameters to consider when operating intensive salmonid aquaculture facilities. While previous research has focused on each of these two variables in rainbow trout Oncorhynchus mykiss, studies examining both variables in combination, and their potential interaction, are absent from the scientific literature. Both swimming...
Authors
Thomas Waldrop, Steven Summerfelt, Patricia M. Mazik, P. Brett Kenney, Christopher Good
Comparisons of stereological and other approaches for quantifying macrophage aggregates in piscine spleens Comparisons of stereological and other approaches for quantifying macrophage aggregates in piscine spleens
Macrophage aggregates (MA s) are focal accumulations of pigmented macrophages in the spleen and other tissues of fish. A central role of MA s is the clearance and destruction of degenerating cells and recycling of some cellular components. Macrophage aggregates also respond to chemical contaminants and infectious agents and may play a role in the adaptive immune response. Tissue damage...
Authors
Mark A Matsche, Vicki S. Blazer, Patricia M. Mazik
Seasonal development of the coccidian parasite Goussia bayae and hepatobiliary histopathology in white perch Morone americana from Chesapeake Bay Seasonal development of the coccidian parasite Goussia bayae and hepatobiliary histopathology in white perch Morone americana from Chesapeake Bay
The coccidium Goussia bayae infects the gallbladder and bile ducts of white perch Morone americana from Chesapeake Bay, USA. Seasonal changes in coccidian infections were analyzed from bile specimens of 1588 fish from the Choptank River during 2016-2018 using wet mount preparations with a Sedgwick-Rafter counting chamber. Histopathology of the gallbladder and liver was analyzed from a...
Authors
Mark A Matsche, Vicki S. Blazer, Patricia M. Mazik
Assessment of skin and liver neoplasms in white sucker (Catostomus commersonii) collected in the Sheboygan River Area of Concern, Wisconsin, in 2017 Assessment of skin and liver neoplasms in white sucker (Catostomus commersonii) collected in the Sheboygan River Area of Concern, Wisconsin, in 2017
Two hundred adult white sucker (Catostomus commersonii), age 3 years and older, were collected from the lower Sheboygan River Area of Concern in 2017, during the spring spawning run. Fish were euthanized, weighed, and measured, and any visible abnormalities were documented. Pieces of raised skin lesions as well as five to eight pieces of liver were removed and preserved for...
Authors
Vicki S. Blazer, Heather L. Walsh, Ryan P. Braham, Patricia M. Mazik
Indicators of exposure to estrogenic compounds at Great Lakes Areas of Concern: Species and site comparisons Indicators of exposure to estrogenic compounds at Great Lakes Areas of Concern: Species and site comparisons
Adverse effects resulting from potential exposure of wild fishes to estrogenic endocrine disruptors was assessed at seven United States Great Lakes Areas of Concern using biomarkers ranging from organismal (gonadosomatic indices) to tissue/plasma (histology, plasma vitellogenin) and molecular (hepatic gene transcripts) levels. Biomonitoring was conducted on pelagic, top predator species
Authors
Vicki S. Blazer, Heather L. Walsh, Cassidy H. Shaw, Luke R. Iwanowicz, Ryan P. Braham, Patricia 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
Assessment of microscopic pathology in fishes collected at sites impacted by wood tar in Pennsylvania Assessment of microscopic pathology in fishes collected at sites impacted by wood tar in Pennsylvania
In an effort to determine whether fish populations in an area affected by wood tar waste exhibited health effects, fish were collected and analyzed with histopathology. Multiple species, including Mottled Sculpin (Cottus bairdii), Creek Chub (Semotilus atromaculatus), White Sucker (Catostumus commersonii), Redside Dace (Clinostomus elongatus), Common Shiner (Luxilus cornutus), and...
Authors
Heather L. Walsh, Vicki S. Blazer, Patricia M. Mazik, Adam J. Sperry, Diana Pavlick
The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and survival of rainbow trout Oncorhynchus mykiss The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and survival of rainbow trout Oncorhynchus mykiss
Swimming exercise and dissolved oxygen (DO) are important parameters to consider when operating intensive salmonid aquaculture facilities. While previous research has focused on each of these two variables in rainbow trout Oncorhynchus mykiss, studies examining both variables in combination, and their potential interaction, are absent from the scientific literature. Both swimming...
Authors
Thomas Waldrop, Steven Summerfelt, Patricia M. Mazik, P. Brett Kenney, Christopher Good
Comparisons of stereological and other approaches for quantifying macrophage aggregates in piscine spleens Comparisons of stereological and other approaches for quantifying macrophage aggregates in piscine spleens
Macrophage aggregates (MA s) are focal accumulations of pigmented macrophages in the spleen and other tissues of fish. A central role of MA s is the clearance and destruction of degenerating cells and recycling of some cellular components. Macrophage aggregates also respond to chemical contaminants and infectious agents and may play a role in the adaptive immune response. Tissue damage...
Authors
Mark A Matsche, Vicki S. Blazer, Patricia M. Mazik
Seasonal development of the coccidian parasite Goussia bayae and hepatobiliary histopathology in white perch Morone americana from Chesapeake Bay Seasonal development of the coccidian parasite Goussia bayae and hepatobiliary histopathology in white perch Morone americana from Chesapeake Bay
The coccidium Goussia bayae infects the gallbladder and bile ducts of white perch Morone americana from Chesapeake Bay, USA. Seasonal changes in coccidian infections were analyzed from bile specimens of 1588 fish from the Choptank River during 2016-2018 using wet mount preparations with a Sedgwick-Rafter counting chamber. Histopathology of the gallbladder and liver was analyzed from a...
Authors
Mark A Matsche, Vicki S. Blazer, Patricia M. Mazik
Assessment of skin and liver neoplasms in white sucker (Catostomus commersonii) collected in the Sheboygan River Area of Concern, Wisconsin, in 2017 Assessment of skin and liver neoplasms in white sucker (Catostomus commersonii) collected in the Sheboygan River Area of Concern, Wisconsin, in 2017
Two hundred adult white sucker (Catostomus commersonii), age 3 years and older, were collected from the lower Sheboygan River Area of Concern in 2017, during the spring spawning run. Fish were euthanized, weighed, and measured, and any visible abnormalities were documented. Pieces of raised skin lesions as well as five to eight pieces of liver were removed and preserved for...
Authors
Vicki S. Blazer, Heather L. Walsh, Ryan P. Braham, Patricia M. Mazik
Indicators of exposure to estrogenic compounds at Great Lakes Areas of Concern: Species and site comparisons Indicators of exposure to estrogenic compounds at Great Lakes Areas of Concern: Species and site comparisons
Adverse effects resulting from potential exposure of wild fishes to estrogenic endocrine disruptors was assessed at seven United States Great Lakes Areas of Concern using biomarkers ranging from organismal (gonadosomatic indices) to tissue/plasma (histology, plasma vitellogenin) and molecular (hepatic gene transcripts) levels. Biomonitoring was conducted on pelagic, top predator species
Authors
Vicki S. Blazer, Heather L. Walsh, Cassidy H. Shaw, Luke R. Iwanowicz, Ryan P. Braham, Patricia 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.