This is an infographic of the life cycle of the parasite, Diplostomum gavium. This parasite affects the Sucker fish in the Upper Klamath Lake. Upper Klamath Lake is home to large colonies of birds and an abundance of snails and fish, making it a haven for trematodes who are reliant on all three for their life cycle. Birds host adult flukes in their intestines.
Jan Lovy, Ph.D.
Jan Lovy is a fish health scientist that conducts research on diseases in wild and farmed fish populations to better understand how their impacts may be mitigated. His research examines how environmental factors influence pathogen transmission and the severity of disease. Prior to joining WFRC, Jan conducted research in Canada, Czech Republic, and the Eastern US.
Jan utilizes various laboratory approaches to monitor for infectious pathogens in fish populations and establishes experimental disease models to investigate drivers for pathogen transmission and disease severity. An emphasis on field monitoring efforts ensures that research is directed at real issues facing our fisheries populations. Jan’s research interests are in fish pathology, characterization of novel infectious pathogens, and parasitology, particularly understanding the ecological drivers for parasite transmission. Histopathology is an important tool for his research in disease monitoring and for evaluating disease severity. Currently, Jan oversees the histology laboratory, which is equipped for conducting routine histology, electron microscopy, and microscopical imaging.
Prior to joining the WFRC, Jan has been able to acquire experience from various laboratories. He completed his early career research, including graduate school and postdoctoral research, in Eastern and Western Canada where he specialized in fish pathology, parasitology, virology, and immunology. His postdoctoral experience included a stop at the Academy of Sciences of the Czech Republic to gain skills in molecular parasitology. He then spent 10 years leading the aquatic animal health program for the N.J. Department of Environmental Protection’s Fish and Wildlife Program. There he worked with fisheries biologists to monitor and research fish diseases. During that time, he developed a marine fish health program with projects that included working with threatened anadromous river herring populations, parasite ecology in black sea bass, and leading research to understand annual epizootic mortality of Atlantic menhaden.
Professional Experience
2022 - Present: Research Fish Biologist, U.S. Geological Survey, Western Fisheries Research Center, Seattle, WA.
2012 – 2022: Research Scientist in Aquatic Animal Health, NJ Department of Environmental Protection, Office of Fish & Wildlife Health & Forensics.
2021 – 2022: American Fisheries Society, Fish Health Section, Blue Book Revision Project Manager.
2010 – 2012: Postdoctoral Research Associate, Pacific Biological Station, Aquatic Animal Health Unit, Fisheries and Oceans Canada, Nanaimo BC, Canada. In collaboration with the USGS Marrowstone Marine Field Station.
2008 – 2010: Postdoctoral Research Associate, Departments of Pathology & Microbiology/Biomedical Sciences, Atlantic Veterinary College, UPEI, Canada.
2008 (Sept. – Dec.): Visiting Scientist, Academy of Sciences of the Czech Republic, Institute of Parasitology, Laboratory of Fish Protistology, Ceske Budejovice, Czech Republic.
2005 – 2010: Electron Microscopy Technician (part time), Department of Graduate Studies, Atlantic Veterinary College, UPEI, Canada.
2002 – 2003: Fisheries Technician, Lebanon Fisheries Laboratory, NJ Division of Fish and Wildlife.
Education and Certifications
2008: Ph.D. in Fish Health. Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Canada
2004: Aquavet II Comparative Pathology of Aquatic Animals, sponsored by Cornell University, College of Veterinary Medicine
2002: B.S. in Aquaculture, Unity College, ME USA
Affiliations and Memberships*
2014 – Present: Member of American Fisheries Society (AFS), Fish Health Section
2020 – 2022: Chair of the Northeast Fish Health Committee
2018 – 2020: Vice Chair of the Northeast Fish Health Committee
2014 – 2018: Member of Technical Standards Committee, AFS, Fish Health Section (Chair in 2016-2017)
Honors and Awards
2008: Governor Generals Award, Gold Medal, awarded for highest academic standing as a doctoral student in the Atlantic Veterinary College, UPEI.
2007: Best Student Presentation, 7th International Symposium on Fish Parasites, Viterbo, Italy.
2007: Young Scientist Award, Free Registration Fee, 7th International Symposium on Fish Parasites, Viterbo, Italy.
2005: Best Student Presentation, Eastern Fish Health Workshop, Shepherdstown, WV.
Science and Products
The Science of Suckers: What’s driving population declines in the Klamath River basin?
AquaDePTH-Aquatic Disease and Pathogen Repository
Surveillance for nervous necrosis virus in black sea bass from the U.S. Atlantic coast Surveillance for nervous necrosis virus in black sea bass from the U.S. Atlantic coast
This is an infographic of the life cycle of the parasite, Diplostomum gavium. This parasite affects the Sucker fish in the Upper Klamath Lake. Upper Klamath Lake is home to large colonies of birds and an abundance of snails and fish, making it a haven for trematodes who are reliant on all three for their life cycle. Birds host adult flukes in their intestines.
This is a photo of fish pathogenic cercariae collected from intermediate snail hosts. The Western Fisheries Research Center (WFRC) is working to determine the extent of the effects of these parasitic organisms on suckers in Klamath Falls, OR. Top: Diplostomum gavium; Bottom: Bolbophorus sp.
This is a photo of fish pathogenic cercariae collected from intermediate snail hosts. The Western Fisheries Research Center (WFRC) is working to determine the extent of the effects of these parasitic organisms on suckers in Klamath Falls, OR. Top: Diplostomum gavium; Bottom: Bolbophorus sp.
Sarah Flores Presentation at the 2025 International Symposium on Fish Parasites
Sarah Flores Presentation at the 2025 International Symposium on Fish ParasitesSarah Flores presenting her lab's work at the 2025 International Symposium on Fish Parasites in Mérida Yucatán, Mexico. Sarah Flores works with the Western Fisheries Research Center in Seattle, WA to help suckers in the Upper Klamath Lake in Klamath Falls, OR.
Sarah Flores Presentation at the 2025 International Symposium on Fish Parasites
Sarah Flores Presentation at the 2025 International Symposium on Fish ParasitesSarah Flores presenting her lab's work at the 2025 International Symposium on Fish Parasites in Mérida Yucatán, Mexico. Sarah Flores works with the Western Fisheries Research Center in Seattle, WA to help suckers in the Upper Klamath Lake in Klamath Falls, OR.
Scientist Collects Snails in Upper Klamath Lake, OR
Scientist Collects Snails in Upper Klamath Lake, ORSarah Flores collecting snails from the marshes of Upper Klamath Lake. At the Western Fisheries Research Center, scientists are conducting research on parasites in Upper Klamath Lake, Klamath Falls, OR.
Scientist Collects Snails in Upper Klamath Lake, OR
Scientist Collects Snails in Upper Klamath Lake, ORSarah Flores collecting snails from the marshes of Upper Klamath Lake. At the Western Fisheries Research Center, scientists are conducting research on parasites in Upper Klamath Lake, Klamath Falls, OR.
Screening Snails for Parasites in Klamath Falls, OR
Screening Snails for Parasites in Klamath Falls, ORLocal snail screening set up in Klamath Falls, OR at the Bureau of Reclamation facility. Five snails per tank on the right and cups with one snail on the left.
Screening Snails for Parasites in Klamath Falls, OR
Screening Snails for Parasites in Klamath Falls, ORLocal snail screening set up in Klamath Falls, OR at the Bureau of Reclamation facility. Five snails per tank on the right and cups with one snail on the left.
Sophie Hall, a research technician with the Western Fisheries Research Center, setting up parasite shedding experiments with snails collected from the Upper Klamath Lake, OR.
Sophie Hall, a research technician with the Western Fisheries Research Center, setting up parasite shedding experiments with snails collected from the Upper Klamath Lake, OR.
Snails collected from Upper Klamath Lake are being used in experiments in the Western Fisheries Research Center’s Seattle Laboratory to study the impacts of eye flukes on the health of endangered suckers.
Snails collected from Upper Klamath Lake are being used in experiments in the Western Fisheries Research Center’s Seattle Laboratory to study the impacts of eye flukes on the health of endangered suckers.
Detection and genetic characterization of red-spotted grouper nervous necrosis virus and a novel genotype of nervous necrosis virus in black sea bass from the U.S. Atlantic coast Detection and genetic characterization of red-spotted grouper nervous necrosis virus and a novel genotype of nervous necrosis virus in black sea bass from the U.S. Atlantic coast
Pathology, tissue distribution, and phylogenomic characterization of largemouth bass virus isolated from a wild smallmouth bass (Micropterus dolomieu) Pathology, tissue distribution, and phylogenomic characterization of largemouth bass virus isolated from a wild smallmouth bass (Micropterus dolomieu)
Discovery and genomic characterization of a novel hepadnavirus from asymptomatic anadromous alewife (Alosa pseudoharengus) Discovery and genomic characterization of a novel hepadnavirus from asymptomatic anadromous alewife (Alosa pseudoharengus)
Seasonal mortality of Wild Atlantic Menhaden (Brevoortia tyrannus) is caused by a virulent clone of Vibrio (Listonella) anguillarum; Implications for biosecurity along the Atlantic Coastal United States Seasonal mortality of Wild Atlantic Menhaden (Brevoortia tyrannus) is caused by a virulent clone of Vibrio (Listonella) anguillarum; Implications for biosecurity along the Atlantic Coastal United States
The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific
Experimental infection studies demonstrating Atlantic salmon as a host and reservoir of viral hemorrhagic septicemia virus type IVa with insights into pathology and host immunity Experimental infection studies demonstrating Atlantic salmon as a host and reservoir of viral hemorrhagic septicemia virus type IVa with insights into pathology and host immunity
Viral tropism and pathology associated with viral hemorrhagic septicemia in larval and juvenile Pacific herring Viral tropism and pathology associated with viral hemorrhagic septicemia in larval and juvenile Pacific herring
Non-USGS Publications**
**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
The Science of Suckers: What’s driving population declines in the Klamath River basin?
AquaDePTH-Aquatic Disease and Pathogen Repository
Surveillance for nervous necrosis virus in black sea bass from the U.S. Atlantic coast Surveillance for nervous necrosis virus in black sea bass from the U.S. Atlantic coast
This is an infographic of the life cycle of the parasite, Diplostomum gavium. This parasite affects the Sucker fish in the Upper Klamath Lake. Upper Klamath Lake is home to large colonies of birds and an abundance of snails and fish, making it a haven for trematodes who are reliant on all three for their life cycle. Birds host adult flukes in their intestines.
This is an infographic of the life cycle of the parasite, Diplostomum gavium. This parasite affects the Sucker fish in the Upper Klamath Lake. Upper Klamath Lake is home to large colonies of birds and an abundance of snails and fish, making it a haven for trematodes who are reliant on all three for their life cycle. Birds host adult flukes in their intestines.
This is a photo of fish pathogenic cercariae collected from intermediate snail hosts. The Western Fisheries Research Center (WFRC) is working to determine the extent of the effects of these parasitic organisms on suckers in Klamath Falls, OR. Top: Diplostomum gavium; Bottom: Bolbophorus sp.
This is a photo of fish pathogenic cercariae collected from intermediate snail hosts. The Western Fisheries Research Center (WFRC) is working to determine the extent of the effects of these parasitic organisms on suckers in Klamath Falls, OR. Top: Diplostomum gavium; Bottom: Bolbophorus sp.
Sarah Flores Presentation at the 2025 International Symposium on Fish Parasites
Sarah Flores Presentation at the 2025 International Symposium on Fish ParasitesSarah Flores presenting her lab's work at the 2025 International Symposium on Fish Parasites in Mérida Yucatán, Mexico. Sarah Flores works with the Western Fisheries Research Center in Seattle, WA to help suckers in the Upper Klamath Lake in Klamath Falls, OR.
Sarah Flores Presentation at the 2025 International Symposium on Fish Parasites
Sarah Flores Presentation at the 2025 International Symposium on Fish ParasitesSarah Flores presenting her lab's work at the 2025 International Symposium on Fish Parasites in Mérida Yucatán, Mexico. Sarah Flores works with the Western Fisheries Research Center in Seattle, WA to help suckers in the Upper Klamath Lake in Klamath Falls, OR.
Scientist Collects Snails in Upper Klamath Lake, OR
Scientist Collects Snails in Upper Klamath Lake, ORSarah Flores collecting snails from the marshes of Upper Klamath Lake. At the Western Fisheries Research Center, scientists are conducting research on parasites in Upper Klamath Lake, Klamath Falls, OR.
Scientist Collects Snails in Upper Klamath Lake, OR
Scientist Collects Snails in Upper Klamath Lake, ORSarah Flores collecting snails from the marshes of Upper Klamath Lake. At the Western Fisheries Research Center, scientists are conducting research on parasites in Upper Klamath Lake, Klamath Falls, OR.
Screening Snails for Parasites in Klamath Falls, OR
Screening Snails for Parasites in Klamath Falls, ORLocal snail screening set up in Klamath Falls, OR at the Bureau of Reclamation facility. Five snails per tank on the right and cups with one snail on the left.
Screening Snails for Parasites in Klamath Falls, OR
Screening Snails for Parasites in Klamath Falls, ORLocal snail screening set up in Klamath Falls, OR at the Bureau of Reclamation facility. Five snails per tank on the right and cups with one snail on the left.
Sophie Hall, a research technician with the Western Fisheries Research Center, setting up parasite shedding experiments with snails collected from the Upper Klamath Lake, OR.
Sophie Hall, a research technician with the Western Fisheries Research Center, setting up parasite shedding experiments with snails collected from the Upper Klamath Lake, OR.
Snails collected from Upper Klamath Lake are being used in experiments in the Western Fisheries Research Center’s Seattle Laboratory to study the impacts of eye flukes on the health of endangered suckers.
Snails collected from Upper Klamath Lake are being used in experiments in the Western Fisheries Research Center’s Seattle Laboratory to study the impacts of eye flukes on the health of endangered suckers.
Detection and genetic characterization of red-spotted grouper nervous necrosis virus and a novel genotype of nervous necrosis virus in black sea bass from the U.S. Atlantic coast Detection and genetic characterization of red-spotted grouper nervous necrosis virus and a novel genotype of nervous necrosis virus in black sea bass from the U.S. Atlantic coast
Pathology, tissue distribution, and phylogenomic characterization of largemouth bass virus isolated from a wild smallmouth bass (Micropterus dolomieu) Pathology, tissue distribution, and phylogenomic characterization of largemouth bass virus isolated from a wild smallmouth bass (Micropterus dolomieu)
Discovery and genomic characterization of a novel hepadnavirus from asymptomatic anadromous alewife (Alosa pseudoharengus) Discovery and genomic characterization of a novel hepadnavirus from asymptomatic anadromous alewife (Alosa pseudoharengus)
Seasonal mortality of Wild Atlantic Menhaden (Brevoortia tyrannus) is caused by a virulent clone of Vibrio (Listonella) anguillarum; Implications for biosecurity along the Atlantic Coastal United States Seasonal mortality of Wild Atlantic Menhaden (Brevoortia tyrannus) is caused by a virulent clone of Vibrio (Listonella) anguillarum; Implications for biosecurity along the Atlantic Coastal United States
The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific The parasite Ichthyophonus sp. in Pacific herring from the coastal NE Pacific
Experimental infection studies demonstrating Atlantic salmon as a host and reservoir of viral hemorrhagic septicemia virus type IVa with insights into pathology and host immunity Experimental infection studies demonstrating Atlantic salmon as a host and reservoir of viral hemorrhagic septicemia virus type IVa with insights into pathology and host immunity
Viral tropism and pathology associated with viral hemorrhagic septicemia in larval and juvenile Pacific herring Viral tropism and pathology associated with viral hemorrhagic septicemia in larval and juvenile Pacific herring
Non-USGS Publications**
**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