Joseph D Schmitt, PhD
I am a Research Fisheries Biologist at the Lake Erie Biological Station. I have wide research interests including food web interactions, invasion ecology, and conservation biology.
I began working at the Lake Erie Biological Station in 2018, and currently lead our percid recruitment trawl survey in the west basin, and our cold-water assessment in the east basin. Lake Erie has been interesting, as it is a dynamic and complex system that is susceptible to harmful algal blooms in the west basin and widespread hypoxia/anoxia in the central basin.
I am currently exploring how these phenomena, along with warming lake temperatures, will affect oxythermal habitat for cold-water species including burbot, whitefish, cisco, and lake trout moving forward. I am also exploring multi-decadal trends in the feeding ecology of percids in Lake Erie, population genetics of Lake Erie whitefish, and have several projects focusing on cisco, which are extirpated from the lake.
Professional Experience
2018 - Present, Research Fisheries Biologist
Education and Certifications
2018 - Ph.D. Fish and Wildlife Conservation, Virginia Tech
2012 - M.S. Fisheries and Aquatic Ecology, Oklahoma State University
2009 - B.S. Biology, summa cum laude, Christopher Newport University
Affiliations and Memberships*
American Fisheries Society
Lake Erie Coldwater Task Group
Science and Products
Science pages by this scientist
Evaluating How Changing Climate and Water Clarity Can Affect Restoration of Native Coregonine Fish in Midwestern Lakes
Coregonines are a sub-family of freshwater fishes within the well-known Salmonidae family. In the upper midwestern U.S., these fishes have provided a key food source to Native Americans for millennia and immigrants for the last several centuries. Since the mid-20th century, however, their diversity and abundance has declined owing to several anthropogenic stressors including overfishing, declining
Data releases by this scientist
Swim chamber respirometry, aerobic scope, and thermal tolerance experiments with two latitudinally-separated cisco (Coregonus artedi) populations 2022-2023
These data include aerobic scope and thermal tolerance measurements from two cisco (Coregonus artedi) populations to evaluate performance and potential adaptation to warming Great Lakes habitats. Cisco come from two stock sources: 1) a northern latitude Lake Huron stock collected as gametes from Les Cheneaux Islands, MI, USA in 2015 and raised in a USGS aquaculture lab in Ann Arbor, MI, and 2) a s
Lake Erie Fish Community Data, 2013-2022
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Lake Erie Fish Community Data, 2013-2021
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Zebra and Quagga Mussel Dry Weight Information; Lake Erie 2014
Impacts of dreissenid mussels (Dreissena spp.) on Great Lakes ecosystems are well documented, and a better understanding of mechanisms that cause variation in mussel abundance is needed. An outstanding question is how much mussel biomass is consumed by fish predation. A significant difficulty for investigating mussel consumption by fish is that mussels in stomachs are often a mix of crushed shell
Lake Erie Fish Community Data, 2013-2019
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Lake Erie Fish Community Data, 2013-2020
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Morphometric measurements of Cisco (Coregonus artedi) from Lake Ontario 2018
These data contain morphometric measurements collected on the left side of Cisco (Coregonus artedi) collected from Lake Ontario in 2018. Measurements were obtained by two methods, first by direct measurements made on the thawed specimens using a hand caliper by one person, then using a digital image technique. The digital image measurements were completed by two different measurers to evaluate how
Diet Data from the Western Basin of Lake Erie Examining White and Yellow Perch, 2012-2016
A fish's diet is the integrated response of multiple ecological interactions including habitat use, foraging behavior, prey community characteristics, and inter-specific interactions. Fish diet samples have quantified how the invasion of white perch into Lake Erie in the early 1950s has influenced interactions with native yellow perch, which are similar in morphology and habitat use. Early researc
Multimedia related to this scientist
Publications by this scientist
Filter Total Items: 14
Comparison of cisco (Coregonus artedi) aerobic scope and thermal tolerance between two latitudinally-separated populations
The cisco Coregonus artedi is a coldwater fish that is distributed throughout much of Canada and the northern United States, including the Laurentian Great Lakes. Cisco historically supported large commercial fisheries in the Great Lakes during the late 1800s and early 1900s, but many populations declined and never recovered. Restoration efforts focusing on re-establishing cisco in the Great Lakes
Authors
Martin Albert Simonson, David Bunnell, Charles P. Madenjian, Kevin Keeler, Joseph Schmitt
Predatory impacts of invasive Blue Catfish in an Atlantic coast estuary
ObjectivePredatory invasive fishes may consume species of management interest and alter food webs. Blue Catfish Ictalurus furcatus is a large-bodied, salinity-tolerant species that exhibits broad diet breadth and preys on species of both conservation concern and fisheries management interest. To better understand the ecological consequences of the establishment of Blue Catfish fisheries, estimates
Authors
Corbin David Hilling, Joseph Schmitt, Yan Jiao, Donald J. Orth
Subindicator: Native Prey Fish Diversity
No abstract available.
Authors
Brian Weidel, Mark Vinson, Darryl W. Hondorp, Ralph W. Tingley, Joseph Schmitt
Genome-wide genetic diversity may help identify fine-scale genetic structure among lake whitefish spawning groups in Lake Erie
In Lake Erie, lake whitefish Coregonus clupeaformis supported lucrative fisheries before populations were decimated by overfishing and water quality degradation. In recent years, there has been a renewed interest in lake whitefish and management of the fishery they support. Lake whitefish spawn on several reefs throughout Lake Erie, but the relative recruitment dynamics and contributions of spawni
Authors
Peter T. Euclide, Joseph Schmitt, Richard Kraus, Andy Cook, Jim Markham
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2022
This report presents biomass-based summaries of fish communities in western Lake Erie derived from USGS bottom trawl surveys conducted from 2013 to 2022 in June and September. The survey design compliments the August ODNR- OMNDMNRF effort by reinforcing stock assessments with more robust data. Analyses herein evaluated trends in total biomass, abundance of dominant predator and forage species, non
Authors
Mark Richard Dufour, Corbin David Hilling, Kevin R. Keretz, Richard Kraus, Richard Cole Oldham, James Roberts, Joseph Schmitt
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2020
This report presents biomass-based summaries of fish communities in the West Basin of Lake Erie derived from USGS bottom trawl surveys conducted from 2013 to 2020 during June and September. The survey design provided temporal and spatial coverage that did not exist in the interagency trawl database, and thus complemented the August ODNR-OMNRF effort to reinforce stock assessments with more robust
Authors
Kevin R. Keretz, Patrick Kočovský, Richard Kraus, James Roberts, Joseph Schmitt
Improved methods for understanding the role of predation on dreissenid population dynamics
Impacts of dreissenid mussels (Dreissena spp.) on Great Lakes ecosystems are well documented, and a better understanding of mechanisms that cause variation in dreissenid abundance is needed. An outstanding question is how much dreissenid biomass is consumed by fish predation. A significant difficulty for investigating dreissenid consumption by fish is that dreissenids in stomachs are often a mix o
Authors
Kevin R. Keretz, Richard Kraus, Joseph Schmitt
Estimates of food consumption rates for invasive Blue Catfish
As a prolific invasive species, Blue Catfish Ictalurus furcatus threaten native organisms in numerous estuarine and tidal freshwaters along the Atlantic coast of the United States. However, no published estimates of consumption rates are available for Blue Catfish in the scientific literature. This information is critical for development of bioenergetics models or estimation of population‐level im
Authors
Joseph Schmitt, Corbin D. Hilling, Donald J. Orth
Comparison of specimen- and image-based morphometrics in Cisco
Morphometric data from fish are typically generated using one of two methods: direct measurements made on a specimen or extraction of distances from a digital picture. We compared data on 12 morphometrics collected with these two methods on the same collection of Cisco Coregonus artedi from Lake Ontario, North America, to assess the degree of bias in measurements made directly on a specimen- vs. a
Authors
Brian O'Malley, Joseph Schmitt, Jeremy P. Holden, Brian Weidel
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2021
A comprehensive understanding of fish populations and their interactions is the cornerstone of modern fishery management and the basis for Lake Erie’s Fish Community Goals and Objectives (FCOs) developed in 2020 (Francis et al. 2020). The 2021 USGS Lake Erie Biological Station annual report is responsive to these FCOs and the U.S. Geological Survey (USGS) obligations via a Memorandum of Understand
Authors
Mark Richard Dufour, Corbin David Hilling, Kevin R. Keretz, Richard T. Kraus, Richard Cole Oldham, James Roberts, Joseph Schmitt
Resource partitioning across a trophic gradient between a freshwater fish and an intraguild exotic
The introduction of exotic species has the potential to cause resource competition with native species and may lead to competitive exclusion when resources are limiting. On the other hand, information is lacking to predict under what alternate trophic conditions coexistence may occur. Comparing diets of native yellow perch Perca flavescens and nonindigenous white perch Morone americana, we examine
Authors
Richard Kraus, Joseph Schmitt, Kevin R. Keretz
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2019
A comprehensive understanding of fish populations and their interactions is the cornerstone of modern fishery management and the basis for Fish Community Goals and Objectives for Lake Erie (Ryan et al. 2003). This report is responsive to U.S. Geological Survey (USGS) obligations via Memorandum of Understanding (MOU) with the Great Lakes Council of Lake Committees (CLC) to provide scientific inform
Authors
Kevin R. Keretz, Patrick Kočovský, Richard Kraus, Joseph Schmitt
Non-USGS Publications**
Evans, H.K., Bunch, A.J., Schmitt, J.D., Hoogakker, F.J., and K.B. Carlson. 2021. High‐throughput sequencing outperforms traditional morphological methods in Blue Catfish diet analysis and reveals novel insights into diet ecology. Ecology and Evolution. https://doi.org/10.1002/ece3.7460.
Orth, D.J., Schmitt, J.D. and Hilling, C.D. 2020. Hyperbole, Simile, Metaphor, and Invasivore: Messaging About non‐native Blue Catfish Expansion. Fisheries 45: 638-646. https://doi.org/10.1002/fsh.10502
Hilling, C. D., Y. Jiao, A. J. Bunch, R. S. Greenlee, J. D. Schmitt, and D. J. Orth. 2020. Growth dynamics of invasive Blue Catfish in four subestuaries of the Chesapeake Bay, USA. North American Journal of Fisheries Management.
Schmitt, J.D., Emmel, J.A., Bunch, A.J., Hilling, C.D., and D.J. Orth. 2019. Feeding ecology and distribution of an invasive apex predator: Flathead Catfish Pylodictis olivaris in subestuaries of the Chesapeake Bay, Virginia, USA. North American Journal of Fisheries Management 39:390-403.
Schmitt, J.D., B.K. Peoples, A. J. Bunch, L. Castello, and D. J. Orth. 2019. Modeling the predation dynamics of invasive Blue Catfish (Ictalurus furcatus) in the Chesapeake Bay. Fishery Bulletin 117(4): 277-290.
Schmitt, J.D., B. K. Peoples, L. Castello, and D.J. Orth. 2019. Feeding ecology of generalist consumers: a case study of invasive Blue Catfish Ictalurus furcatus in the Chesapeake Bay. Environmental Biology of Fishes 102(3): 443-465.
Schmitt, J. D., E.M. Hallerman, A. Bunch, Z. Moran, J. A. Emmel, and D. J. Orth. 2017. Predation and prey selectivity by nonnative catfish on migrating alosines in an Atlantic slope estuary. Marine and Coastal Fisheries 9:108-125.
Schmitt, J.D., Gedamke, T., DuPaul, W. D., and J. A. Musick. 2015. Ontogenetic and sex-specific shifts in the feeding habits of the barndoor skate <i>Dipturus laevis</i> on Georges Bank. Marine and Coastal Fisheries Dynamics, Management, and Ecosystem Science 7(1): 409-418.
Schmitt, J.D. and D.J. Orth. 2015. First record of pughead deformity in Blue Catfish. Transactions of the American Fisheries Society 144(6):1111-1116.
Moran, Z., Orth, D. J., Schmitt, J. D., Hallerman, E.M., and R. Aquilar. 2015. Effectiveness of DNA barcoding for identifying piscine prey items in stomach contents of piscivorous catfish. Environmental Biology of Fishes 98:1-7.
Schmitt, J.D., and Shoup, D.E. 2013. Delayed hooking mortality of Blue Catfish Ictalurus furcatus caught on juglines. North American Journal of Fisheries Management 33(2): 245-254.
**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
Science pages by this scientist
Evaluating How Changing Climate and Water Clarity Can Affect Restoration of Native Coregonine Fish in Midwestern Lakes
Coregonines are a sub-family of freshwater fishes within the well-known Salmonidae family. In the upper midwestern U.S., these fishes have provided a key food source to Native Americans for millennia and immigrants for the last several centuries. Since the mid-20th century, however, their diversity and abundance has declined owing to several anthropogenic stressors including overfishing, declining
Data releases by this scientist
Swim chamber respirometry, aerobic scope, and thermal tolerance experiments with two latitudinally-separated cisco (Coregonus artedi) populations 2022-2023
These data include aerobic scope and thermal tolerance measurements from two cisco (Coregonus artedi) populations to evaluate performance and potential adaptation to warming Great Lakes habitats. Cisco come from two stock sources: 1) a northern latitude Lake Huron stock collected as gametes from Les Cheneaux Islands, MI, USA in 2015 and raised in a USGS aquaculture lab in Ann Arbor, MI, and 2) a s
Lake Erie Fish Community Data, 2013-2022
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Lake Erie Fish Community Data, 2013-2021
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Zebra and Quagga Mussel Dry Weight Information; Lake Erie 2014
Impacts of dreissenid mussels (Dreissena spp.) on Great Lakes ecosystems are well documented, and a better understanding of mechanisms that cause variation in mussel abundance is needed. An outstanding question is how much mussel biomass is consumed by fish predation. A significant difficulty for investigating mussel consumption by fish is that mussels in stomachs are often a mix of crushed shell
Lake Erie Fish Community Data, 2013-2019
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Lake Erie Fish Community Data, 2013-2020
Assessing the distribution and abundance of both predator and prey (forage) fish species is a cornerstone of ecosystem-based fishery management, and supports decision making that considers food-web interactions. In support of binational Great Lakes fishery management the objectives of this survey were to: provide estimates of densities of key forage and predator species in the western basin of Lak
Morphometric measurements of Cisco (Coregonus artedi) from Lake Ontario 2018
These data contain morphometric measurements collected on the left side of Cisco (Coregonus artedi) collected from Lake Ontario in 2018. Measurements were obtained by two methods, first by direct measurements made on the thawed specimens using a hand caliper by one person, then using a digital image technique. The digital image measurements were completed by two different measurers to evaluate how
Diet Data from the Western Basin of Lake Erie Examining White and Yellow Perch, 2012-2016
A fish's diet is the integrated response of multiple ecological interactions including habitat use, foraging behavior, prey community characteristics, and inter-specific interactions. Fish diet samples have quantified how the invasion of white perch into Lake Erie in the early 1950s has influenced interactions with native yellow perch, which are similar in morphology and habitat use. Early researc
Multimedia related to this scientist
Publications by this scientist
Filter Total Items: 14
Comparison of cisco (Coregonus artedi) aerobic scope and thermal tolerance between two latitudinally-separated populations
The cisco Coregonus artedi is a coldwater fish that is distributed throughout much of Canada and the northern United States, including the Laurentian Great Lakes. Cisco historically supported large commercial fisheries in the Great Lakes during the late 1800s and early 1900s, but many populations declined and never recovered. Restoration efforts focusing on re-establishing cisco in the Great Lakes
Authors
Martin Albert Simonson, David Bunnell, Charles P. Madenjian, Kevin Keeler, Joseph Schmitt
Predatory impacts of invasive Blue Catfish in an Atlantic coast estuary
ObjectivePredatory invasive fishes may consume species of management interest and alter food webs. Blue Catfish Ictalurus furcatus is a large-bodied, salinity-tolerant species that exhibits broad diet breadth and preys on species of both conservation concern and fisheries management interest. To better understand the ecological consequences of the establishment of Blue Catfish fisheries, estimates
Authors
Corbin David Hilling, Joseph Schmitt, Yan Jiao, Donald J. Orth
Subindicator: Native Prey Fish Diversity
No abstract available.
Authors
Brian Weidel, Mark Vinson, Darryl W. Hondorp, Ralph W. Tingley, Joseph Schmitt
Genome-wide genetic diversity may help identify fine-scale genetic structure among lake whitefish spawning groups in Lake Erie
In Lake Erie, lake whitefish Coregonus clupeaformis supported lucrative fisheries before populations were decimated by overfishing and water quality degradation. In recent years, there has been a renewed interest in lake whitefish and management of the fishery they support. Lake whitefish spawn on several reefs throughout Lake Erie, but the relative recruitment dynamics and contributions of spawni
Authors
Peter T. Euclide, Joseph Schmitt, Richard Kraus, Andy Cook, Jim Markham
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2022
This report presents biomass-based summaries of fish communities in western Lake Erie derived from USGS bottom trawl surveys conducted from 2013 to 2022 in June and September. The survey design compliments the August ODNR- OMNDMNRF effort by reinforcing stock assessments with more robust data. Analyses herein evaluated trends in total biomass, abundance of dominant predator and forage species, non
Authors
Mark Richard Dufour, Corbin David Hilling, Kevin R. Keretz, Richard Kraus, Richard Cole Oldham, James Roberts, Joseph Schmitt
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2020
This report presents biomass-based summaries of fish communities in the West Basin of Lake Erie derived from USGS bottom trawl surveys conducted from 2013 to 2020 during June and September. The survey design provided temporal and spatial coverage that did not exist in the interagency trawl database, and thus complemented the August ODNR-OMNRF effort to reinforce stock assessments with more robust
Authors
Kevin R. Keretz, Patrick Kočovský, Richard Kraus, James Roberts, Joseph Schmitt
Improved methods for understanding the role of predation on dreissenid population dynamics
Impacts of dreissenid mussels (Dreissena spp.) on Great Lakes ecosystems are well documented, and a better understanding of mechanisms that cause variation in dreissenid abundance is needed. An outstanding question is how much dreissenid biomass is consumed by fish predation. A significant difficulty for investigating dreissenid consumption by fish is that dreissenids in stomachs are often a mix o
Authors
Kevin R. Keretz, Richard Kraus, Joseph Schmitt
Estimates of food consumption rates for invasive Blue Catfish
As a prolific invasive species, Blue Catfish Ictalurus furcatus threaten native organisms in numerous estuarine and tidal freshwaters along the Atlantic coast of the United States. However, no published estimates of consumption rates are available for Blue Catfish in the scientific literature. This information is critical for development of bioenergetics models or estimation of population‐level im
Authors
Joseph Schmitt, Corbin D. Hilling, Donald J. Orth
Comparison of specimen- and image-based morphometrics in Cisco
Morphometric data from fish are typically generated using one of two methods: direct measurements made on a specimen or extraction of distances from a digital picture. We compared data on 12 morphometrics collected with these two methods on the same collection of Cisco Coregonus artedi from Lake Ontario, North America, to assess the degree of bias in measurements made directly on a specimen- vs. a
Authors
Brian O'Malley, Joseph Schmitt, Jeremy P. Holden, Brian Weidel
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2021
A comprehensive understanding of fish populations and their interactions is the cornerstone of modern fishery management and the basis for Lake Erie’s Fish Community Goals and Objectives (FCOs) developed in 2020 (Francis et al. 2020). The 2021 USGS Lake Erie Biological Station annual report is responsive to these FCOs and the U.S. Geological Survey (USGS) obligations via a Memorandum of Understand
Authors
Mark Richard Dufour, Corbin David Hilling, Kevin R. Keretz, Richard T. Kraus, Richard Cole Oldham, James Roberts, Joseph Schmitt
Resource partitioning across a trophic gradient between a freshwater fish and an intraguild exotic
The introduction of exotic species has the potential to cause resource competition with native species and may lead to competitive exclusion when resources are limiting. On the other hand, information is lacking to predict under what alternate trophic conditions coexistence may occur. Comparing diets of native yellow perch Perca flavescens and nonindigenous white perch Morone americana, we examine
Authors
Richard Kraus, Joseph Schmitt, Kevin R. Keretz
Fisheries research and monitoring activities of the Lake Erie Biological Station, 2019
A comprehensive understanding of fish populations and their interactions is the cornerstone of modern fishery management and the basis for Fish Community Goals and Objectives for Lake Erie (Ryan et al. 2003). This report is responsive to U.S. Geological Survey (USGS) obligations via Memorandum of Understanding (MOU) with the Great Lakes Council of Lake Committees (CLC) to provide scientific inform
Authors
Kevin R. Keretz, Patrick Kočovský, Richard Kraus, Joseph Schmitt
Non-USGS Publications**
Evans, H.K., Bunch, A.J., Schmitt, J.D., Hoogakker, F.J., and K.B. Carlson. 2021. High‐throughput sequencing outperforms traditional morphological methods in Blue Catfish diet analysis and reveals novel insights into diet ecology. Ecology and Evolution. https://doi.org/10.1002/ece3.7460.
Orth, D.J., Schmitt, J.D. and Hilling, C.D. 2020. Hyperbole, Simile, Metaphor, and Invasivore: Messaging About non‐native Blue Catfish Expansion. Fisheries 45: 638-646. https://doi.org/10.1002/fsh.10502
Hilling, C. D., Y. Jiao, A. J. Bunch, R. S. Greenlee, J. D. Schmitt, and D. J. Orth. 2020. Growth dynamics of invasive Blue Catfish in four subestuaries of the Chesapeake Bay, USA. North American Journal of Fisheries Management.
Schmitt, J.D., Emmel, J.A., Bunch, A.J., Hilling, C.D., and D.J. Orth. 2019. Feeding ecology and distribution of an invasive apex predator: Flathead Catfish Pylodictis olivaris in subestuaries of the Chesapeake Bay, Virginia, USA. North American Journal of Fisheries Management 39:390-403.
Schmitt, J.D., B.K. Peoples, A. J. Bunch, L. Castello, and D. J. Orth. 2019. Modeling the predation dynamics of invasive Blue Catfish (Ictalurus furcatus) in the Chesapeake Bay. Fishery Bulletin 117(4): 277-290.
Schmitt, J.D., B. K. Peoples, L. Castello, and D.J. Orth. 2019. Feeding ecology of generalist consumers: a case study of invasive Blue Catfish Ictalurus furcatus in the Chesapeake Bay. Environmental Biology of Fishes 102(3): 443-465.
Schmitt, J. D., E.M. Hallerman, A. Bunch, Z. Moran, J. A. Emmel, and D. J. Orth. 2017. Predation and prey selectivity by nonnative catfish on migrating alosines in an Atlantic slope estuary. Marine and Coastal Fisheries 9:108-125.
Schmitt, J.D., Gedamke, T., DuPaul, W. D., and J. A. Musick. 2015. Ontogenetic and sex-specific shifts in the feeding habits of the barndoor skate <i>Dipturus laevis</i> on Georges Bank. Marine and Coastal Fisheries Dynamics, Management, and Ecosystem Science 7(1): 409-418.
Schmitt, J.D. and D.J. Orth. 2015. First record of pughead deformity in Blue Catfish. Transactions of the American Fisheries Society 144(6):1111-1116.
Moran, Z., Orth, D. J., Schmitt, J. D., Hallerman, E.M., and R. Aquilar. 2015. Effectiveness of DNA barcoding for identifying piscine prey items in stomach contents of piscivorous catfish. Environmental Biology of Fishes 98:1-7.
Schmitt, J.D., and Shoup, D.E. 2013. Delayed hooking mortality of Blue Catfish Ictalurus furcatus caught on juglines. North American Journal of Fisheries Management 33(2): 245-254.
**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.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government