Eric Leis
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View article: Iodophor Reduces <i>Carnobacterium maltaromaticum</i> and <i>Vagococcus salmoninarum</i> Prevalence During Brook Trout ( <i>Salvelinus fontinalis</i> ) Spawning
Iodophor Reduces <i>Carnobacterium maltaromaticum</i> and <i>Vagococcus salmoninarum</i> Prevalence During Brook Trout ( <i>Salvelinus fontinalis</i> ) Spawning Open
This study examines the effects of iodophor disinfection on the prevalence of Carnobacterium maltaromaticum and Vagococcus salmoninarum during several years of spawning brook trout ( Salvelinus fontinalis ) . The first year of the study, i…
View article: A New Species of Myxobolus (Cnidaria: Myxosporea: Myxobolidae) from the Mesenteries of Blackspotted Topminnow, Fundulus olivaceus (Cyprinodontiformes: Fundulidae), from the Upper Ouachita River Drainage, Arkansas, USA
A New Species of Myxobolus (Cnidaria: Myxosporea: Myxobolidae) from the Mesenteries of Blackspotted Topminnow, Fundulus olivaceus (Cyprinodontiformes: Fundulidae), from the Upper Ouachita River Drainage, Arkansas, USA Open
Between March and August 2024, three species of Fundulus topminnows, including two northern studfish, Fundulus catenatus, six blackspotted topminnows, Fundulus olivaceus, and eleven blackstriped topminnows, Fundulus notatus, were collected…
View article: Sampling mass mortality events to enable diagnoses: A protocol using freshwater mussels
Sampling mass mortality events to enable diagnoses: A protocol using freshwater mussels Open
Many taxa around the globe are threatened by often unexplained mass mortality events (MMEs), which can decimate populations and compromise key ecosystem functions. One example of a highly threatened taxon facing frequent MMEs is freshwater…
View article: Sampling mass mortality events to enable diagnoses: A protocol using freshwater mussels
Sampling mass mortality events to enable diagnoses: A protocol using freshwater mussels Open
1. Many taxa around the globe are threatened by often unexplained mass mortality events (MMEs), which can decimate populations and compromise key ecosystem functions. One example of a highly threatened taxon facing frequent MMEs is freshwa…
View article: Bacteriological analysis of unionid hemolymph collected from freshwater mussel populations in the Pacific northwestern United States
Bacteriological analysis of unionid hemolymph collected from freshwater mussel populations in the Pacific northwestern United States Open
Native freshwater mussel (Unionidae) mortality events have been occurring with increased frequency in recent decades, with few investigations into potential etiological agents. In the western United States, no surveys have been published r…
View article: Freshwater Mussel Viromes Increase Rapidly in Diversity and Abundance When Hosts Are Released from Captivity into the Wild
Freshwater Mussel Viromes Increase Rapidly in Diversity and Abundance When Hosts Are Released from Captivity into the Wild Open
Freshwater mussels (order: Unionida) are highly imperiled globally and are increasingly the focus of captive propagation efforts to protect and restore wild populations. The Upper Tennessee River Basin (UTRB) in Virginia is a freshwater bi…
View article: Hirsutonosema embarrassi n. gen. n. sp. (Phylum Microsporidia) in the Ovary of Mucket (Actinonaias ligamentina), Plain Pocketbook (Lampsilis cardium), and Fatmucket (Lampsilis siliquoidea) (Unionidae) from the Embarrass River, Wisconsin, USA
Hirsutonosema embarrassi n. gen. n. sp. (Phylum Microsporidia) in the Ovary of Mucket (Actinonaias ligamentina), Plain Pocketbook (Lampsilis cardium), and Fatmucket (Lampsilis siliquoidea) (Unionidae) from the Embarrass River, Wisconsin, USA Open
During an epidemiological survey following a mortality event of freshwater mussels in 2018 in the Embarrass River, Wisconsin, USA, we identified a novel microsporidian parasite in the ovaries of mucket (Actinonaias ligamentina), plain pock…
View article: Five Species of Wild Freshwater Sport Fish in Wisconsin, USA, Reveal Highly Diverse Viromes
Five Species of Wild Freshwater Sport Fish in Wisconsin, USA, Reveal Highly Diverse Viromes Open
Studies of marine fish have revealed distant relatives of viruses important to global fish and animal health, but few such studies exist for freshwater fish. To investigate whether freshwater fish also host such viruses, we characterized t…
View article: Viruses of Freshwater Mussels during Mass Mortality Events in Oregon and Washington, USA
Viruses of Freshwater Mussels during Mass Mortality Events in Oregon and Washington, USA Open
Freshwater mussels (Unionida) are globally imperiled, in part due to largely unexplained mass mortality events (MMEs). While recent studies have begun to investigate the possibility that mussel MMEs in the Eastern USA may be caused by infe…
View article: A Mortality Event Involving Endangered Pallid Sturgeon (Scaphirhynchus albus) Associated with Gyrodactylus conei n. sp. (Monogenea: Gyrodactylidae) Effectively Treated with Parasite-S (Formalin)
A Mortality Event Involving Endangered Pallid Sturgeon (Scaphirhynchus albus) Associated with Gyrodactylus conei n. sp. (Monogenea: Gyrodactylidae) Effectively Treated with Parasite-S (Formalin) Open
In January 2020, a mortality event was documented in endangered Pallid Sturgeon (Scaphirhynchus albus) at the Neosho National Fish Hatchery (Neosho, MO, USA). Moribund fish appeared emaciated, with hemorrhages on the fins and rostrums. Mor…
View article: Plasticity, Paralogy, and Pseudogenization: Rhabdoviruses of Freshwater Mussels Elucidate Mechanisms of Viral Genome Diversification and the Evolution of the Finfish-Infecting Rhabdoviral Genera
Plasticity, Paralogy, and Pseudogenization: Rhabdoviruses of Freshwater Mussels Elucidate Mechanisms of Viral Genome Diversification and the Evolution of the Finfish-Infecting Rhabdoviral Genera Open
Viruses in the family Rhabdoviridae infect a variety of hosts, including vertebrates, invertebrates, plants and fungi, with important consequences for health and agriculture. This study describes two newly discovered viruses of freshwater …
View article: A Bacteriological Comparison of the Hemolymph from Healthy and Moribund Unionid Mussel Populations in the Upper Midwestern U.S.A. Prompts the Development of Diagnostic Assays to Detect Yokenella regensburgei
A Bacteriological Comparison of the Hemolymph from Healthy and Moribund Unionid Mussel Populations in the Upper Midwestern U.S.A. Prompts the Development of Diagnostic Assays to Detect Yokenella regensburgei Open
Recent bacteriological investigations of freshwater mussel mortality events in the southeastern United States have identified a variety of bacteria and differences in bacterial communities between sick and healthy mussels. In particular, Y…
View article: Efficacy of hydrogen peroxide to reduce <i>Gyrodactylus</i> species infestation density on four fish species
Efficacy of hydrogen peroxide to reduce <i>Gyrodactylus</i> species infestation density on four fish species Open
Objective The ability to effectively treat parasitic infestations of fish is of high importance for fish culture facilities. However, tools or approved therapies for treating infestations on fish are limited. This paper summarizes results …
View article: Further Bacteriological Analysis of Annual Pheasantshell (Actinonaias Pectorosa) Mussel Mortality Events in the Clinch River (Virginia/Tennessee), USA, Reveals a Consistent Association with Yokenella Regensburgei
Further Bacteriological Analysis of Annual Pheasantshell (Actinonaias Pectorosa) Mussel Mortality Events in the Clinch River (Virginia/Tennessee), USA, Reveals a Consistent Association with Yokenella Regensburgei Open
Pheasantshell (Actinonaias pectorosa) mussels in the Clinch River (Tennessee/Virginia, USA) have declined dramatically in recent years. The bacterium Yokenella regensburgei was first isolated with high prevalence from Pheasantshells during…
View article: New Geographic Distributional Records for Two Lampreys (Petromyzontiformes: Petromyzontidae) in Arkansas, with Notes on Histopathology
New Geographic Distributional Records for Two Lampreys (Petromyzontiformes: Petromyzontidae) in Arkansas, with Notes on Histopathology Open
The recent update (2nd edition) of the Fishes of Arkansas includes what is known, to date, on the geographic distribution of five species of lampreys that occur in the state. Here, we provide new distributional records on two of those spec…
View article: Mussel mass mortality in the Clinch River, USA: metabolomics detects affected pathways and biomarkers of stress
Mussel mass mortality in the Clinch River, USA: metabolomics detects affected pathways and biomarkers of stress Open
Biologists monitoring freshwater mussel (order Unionida) populations rely on behavioral, often subjective, signs to identify moribund (“sick”) or stressed mussels, such as gaping valves and slow response to probing, and they lack clinical …
View article: Freshwater Mussels Show Elevated Viral Richness and Intensity during a Mortality Event
Freshwater Mussels Show Elevated Viral Richness and Intensity during a Mortality Event Open
Freshwater mussels (Unionida) are among the world’s most imperiled taxa, but the relationship between freshwater mussel mortality events and infectious disease is largely unstudied. We surveyed viromes of a widespread and abundant species …
View article: A Novel Gonadotropic Microsporidian Parasite (Microsporidium clinchi n. sp.) Infecting a Declining Population of Pheasantshell Mussels (Actinonaias pectorosa) (Unioinidae) from the Clinch River, USA
A Novel Gonadotropic Microsporidian Parasite (Microsporidium clinchi n. sp.) Infecting a Declining Population of Pheasantshell Mussels (Actinonaias pectorosa) (Unioinidae) from the Clinch River, USA Open
Freshwater mussels of the order Unionida are among the most endangered animal groups globally, but the causes of their population decline are often enigmatic, with little known about the role of disease. In 2018, we collected wild adult ph…
View article: Mussel Mass Mortality and the Microbiome: Evidence for Shifts in the Bacterial Microbiome of a Declining Freshwater Bivalve
Mussel Mass Mortality and the Microbiome: Evidence for Shifts in the Bacterial Microbiome of a Declining Freshwater Bivalve Open
Freshwater mussels (Unionida) are suffering mass mortality events worldwide, but the causes remain enigmatic. Here, we describe an analysis of bacterial loads, community structure, and inferred metabolic pathways in the hemolymph of pheasa…
View article: Mass mortality in freshwater mussels (Actinonaias pectorosa) in the Clinch River, USA, linked to a novel densovirus
Mass mortality in freshwater mussels (Actinonaias pectorosa) in the Clinch River, USA, linked to a novel densovirus Open
Freshwater mussels (order Unionida) are among the world’s most biodiverse but imperiled taxa. Recent unionid mass mortality events around the world threaten ecosystem services such as water filtration, nutrient cycling, habitat stabilizati…
View article: Morphometric and genetic evidence for cryptic diversity in<i>Gyrodactylus</i>(Monogenea) infecting non-native European populations of<i>Ameiurus nebulosus</i>and<i>A. melas</i>
Morphometric and genetic evidence for cryptic diversity in<i>Gyrodactylus</i>(Monogenea) infecting non-native European populations of<i>Ameiurus nebulosus</i>and<i>A. melas</i> Open
Gyrodactylid parasites were observed on non-native populations of North-American freshwater catfishes, Ameiurus nebulosus and Ameiurus melas (Siluriformes: Ictaluridae), at several sites in the Elbe River basin, Czech Republic, Europe. Usi…
View article: A Comparison of Bacteria Cultured from Unionid Mussel Hemolymph between Stable Populations in the Upper Mississippi River Basin and Populations Affected by a Mortality Event in the Clinch River
A Comparison of Bacteria Cultured from Unionid Mussel Hemolymph between Stable Populations in the Upper Mississippi River Basin and Populations Affected by a Mortality Event in the Clinch River Open
The diagnosis of bacterial disease in freshwater unionid mussels has been hindered by a lack of baseline information regarding the microbial communities associated with these animals. In this study, we cultured and identified bacteria from…
View article: A Novel Picorna-Like Virus in a Wabash Pigtoe (Fusconaia flava) from the Upper Mississippi River, USA
A Novel Picorna-Like Virus in a Wabash Pigtoe (Fusconaia flava) from the Upper Mississippi River, USA Open
Unionid mussels are threatened by multiple environmental stressors and have experienced mass mortality events over the last several decades, but the role of infectious disease in unionid health and population declines remains poorly unders…
View article: A Comparison of Bacteria Cultured from Unionid Mussel Hemolymph between Stable Populations in the Upper Mississippi River Basin and Populations Affected by a Mortality Event in the Clinch River
A Comparison of Bacteria Cultured from Unionid Mussel Hemolymph between Stable Populations in the Upper Mississippi River Basin and Populations Affected by a Mortality Event in the Clinch River Open
The diagnosis of bacterial disease in freshwater unionid mussels has been hindered by a lack of baseline information regarding the microbial communities associated with these animals. In this study, we cultured and identified bacteria from…