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- Chesapeake-Bay; Salinity; Susceptibility; Temperature; Epizootiology (1)
- Coastal wetlands; disease ecology; eutrophication; fertilizer; host traits; intertidal (1)
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- Dactylogyrus vastator. Dactylogyrus solidus. (1)
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- Disease prevalence; disease impacts; life history; Crustacea; phenology; molting (1)
- Haplosporidian; shrimp; parasite; molecular phylogenetic analysis (1)
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Articles 1 - 30 of 55
Full-Text Articles in Aquaculture and Fisheries
Characterization Of Microsporidian Ameson Herrnkindi Sp. Nov. Infecting Caribbean Spiny Lobsters Panulirus Argus, Hamish J. Small, Gd Stentiford, Dc Behringer, Ma Freeman, Nam Atherley, Kimberly S. Reece, Jeffrey D. Shields
Characterization Of Microsporidian Ameson Herrnkindi Sp. Nov. Infecting Caribbean Spiny Lobsters Panulirus Argus, Hamish J. Small, Gd Stentiford, Dc Behringer, Ma Freeman, Nam Atherley, Kimberly S. Reece, Jeffrey D. Shields
VIMS Articles
The Caribbean spiny lobster Panulirus argus supports a large and valuable fishery in the Caribbean Sea. In 2007-2008, a rare microsporidian parasite with spore characteristics typical of the Ameson genus was detected in 2 spiny lobsters from southeast Florida (FL). However, the parasite species was not confirmed by molecular analyses. To address this deficiency, reported here are structural and molecular data on single lobsters displaying comparable ‘cotton-like’ abdominal muscle containing ovoid microsporidian spores found at different locations in FL in 2014 and 2018 and in Saint Kitts and Nevis Islands in 2017. In the lobster from 2014, multiple life stages …
Rising Temperatures, Molting Phenology, And Epizootic Shell Disease In The American Lobster, Maya Groner, Jeffrey D. Shields, Df Landers, J Swenarton, Jm Hoenig
Rising Temperatures, Molting Phenology, And Epizootic Shell Disease In The American Lobster, Maya Groner, Jeffrey D. Shields, Df Landers, J Swenarton, Jm Hoenig
VIMS Articles
Phenological mismatchmaladaptive changes in phenology resulting from altered timing of environmental cuesis an increasing concern in many ecological systems, yet its effects on disease are poorly characterized. American lobster (Homarus americanus) is declining at its southern geographic limit. Rising seawater temperatures are associated with seasonal outbreaks of epizootic shell disease (ESD), which peaks in prevalence in the fall. We used a 34-year mark-recapture data set to investigate relationships between temperature, molting phenology, and ESD in Long Island Sound, where temperatures are increasing at 0.4 degrees C per decade. Our analyses support the hypothesis that phenological mismatch is linked to the …
Reproductive Investment In Crassostrea Virginica As An Indicator Of A Tolerance Response To Perkinsus Marinus, Lauren Irene Huey
Reproductive Investment In Crassostrea Virginica As An Indicator Of A Tolerance Response To Perkinsus Marinus, Lauren Irene Huey
Dissertations, Theses, and Masters Projects
The Chesapeake Bay region values oysters for the ecosystem services, lucrative fishery, and historical significance that the species embodies; however, over the last half century, oyster abundances have been reduced to historical lows. Two protozoan parasites, Perkinsus marinus and Haplosporidium nelsoni, have been major influences on oyster populations, especially in high-salinity regions. Today, the population is recovering; catches have increased and oysters have expanded spatially. to investigate the cause of the recovery, three measurements were made on slides of oysters from a histological archive collected during summer at Wreck Shoal in the James River from 1988–2017: oocyte diameter, oocyte density, …
Bottom-Up Control Of Parasites, David S. Johnson, Richard Heard
Bottom-Up Control Of Parasites, David S. Johnson, Richard Heard
VIMS Articles
Parasitism is a fundamental ecological interaction. Yet we understand relatively little about the ecological role of parasites compared to the role of free-living organisms. Bottom-up theory predicts that resource enhancement will increase the abundance and biomass of free-living organisms. Similarly, parasite abundance and biomass should increase in an ecosystem with resource enhancement. We tested this hypothesis in a landscape-level experiment in which salt marshes (60,000 m2 each) received elevated nutrient concentrations via flooding tidal waters for 11 yr to mimic eutrophication. Nutrient enrichment elevated the densities of the talitrid amphipod, Orchestia grillus, and the density and biomass of its …
Impact Of The Parasitic Nematode Anguillicoloides Crassus On American Eels (Anguilla Rostrata) In Chesapeake Bay, Zoemma Taudel Warshafsky
Impact Of The Parasitic Nematode Anguillicoloides Crassus On American Eels (Anguilla Rostrata) In Chesapeake Bay, Zoemma Taudel Warshafsky
Dissertations, Theses, and Masters Projects
American eels are infected by the introduced parasitic nematode, Anguillicoloides crassus, which can cause significant damage to their swimbladders. Despite the high prevalence and severe damage caused by A. crassus, the population level effects on American eels are not well understood. The prevalence and swimbladder damage in young glass eels and elvers are relatively unstudied, despite the potential for this parasite to cause tissue damage. Additionally, the effects of environmental, temporal, and spatial variables have been debated in previous studies without consensus. Also, the potential for eels to recover from infection and tissue damage has been speculated but not definitively …
Influence Of Perkinsus Marinus Infection And Oyster Health On Levels Of Human-Pathogenic Vibrios In Oysters, Lydia M. Bienlien
Influence Of Perkinsus Marinus Infection And Oyster Health On Levels Of Human-Pathogenic Vibrios In Oysters, Lydia M. Bienlien
Dissertations, Theses, and Masters Projects
The eastern oyster Crassostrea virginica is an ecologically and commercially important species whose natural populations have been devastated by overharvesting, habitat destruction, and disease, but the rapid growth of oyster aquaculture has shown potential to restore the economic significance of this species. A key threat to the growth and sustainability of oyster aquaculture is the association of human-pathogenic Vibrio bacteria with product marketed for raw consumption. Two Vibrio species, Vibrio vulnificus and Vibrio parahaemolyticus, are the causes of the highest rates of seafood consumption-related mortality and gastrointestinal illness, respectively. Identification of the factors influencing V. vulnificus and V. parahaemolyticus prevalence …
Impact Of Anguillicolides Crassus On American Eels (Anguilla Rostrata), Andrew Wargo, Rob Latour, Troy D. Tuckey, Wolfgang K. Vogelbein
Impact Of Anguillicolides Crassus On American Eels (Anguilla Rostrata), Andrew Wargo, Rob Latour, Troy D. Tuckey, Wolfgang K. Vogelbein
Presentations
American eels Anguilla rostrata are infected by an introduced parasitic nematode Anguillicoloides crassus, which can cause extreme necrosis of their swimbladders, yet effects on the eel population are currently unknown. We collected 3 eel life stages (glass, elver, and yellow) and the presence of A. crassus and swimbladder damage in each eel was quantified. The preliminary data show over 60% prevalence and an even higher prevalence of damaged swimbladders.
The Role Of Mycobacteriosis In Elevated Natural Mortality Of Chesapeake Bay Striped Bass: Developing Better Models For Stock Assessment And Management : A Final Report, Wolfgang K. Vogelbein, John Hoenig, David Gauthier, Matthew Smith, Phil Sadler, Howard Kator, Martha Rhodes
The Role Of Mycobacteriosis In Elevated Natural Mortality Of Chesapeake Bay Striped Bass: Developing Better Models For Stock Assessment And Management : A Final Report, Wolfgang K. Vogelbein, John Hoenig, David Gauthier, Matthew Smith, Phil Sadler, Howard Kator, Martha Rhodes
Reports
Mycobacteriosis is a chronic systemic disease of fishes caused by bacteria belonging to the genus Mycobacterium. The disease currently affects striped bass throughout Chesapeake Bay and prevalence is higher than 90% in certain age groups. Two recently described species, M. shottsii and M. pseudoshottsii, are the most common isolates obtained from diseased fish and are considered the primary etiologic agents. Recent indications that natural mortality (M) has become elevated in Chesapeake Bay striped bass and that mycobacteriosis may be the underlying cause, has caused concern among fishermen, fisheries managers and scientists. However, fundamental questions, such as transmission mode, duration of …
Status Of The Major Oyster Diseases In Virginia 2006-2008 A Summary Of The Annual Oyster Disease Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2006-2008 A Summary Of The Annual Oyster Disease Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Reports
Fall Survey sampling revealed P. marinus levels to be generally normal to high in Virginia tributaries. By 2007 P. marinus was present on every oyster reef sampled, and by the end of the 2006-2008 period the parasite was probably causing some mortality throughout Virginia waters. Data for H. nelsoni are still incomplete for 2006/7 because of funding limitations, but in 2008 H. nelsoni was observed at 17 of 31 sampled reefs, a marked expansion in distribution since 2003/4. A significant MSX disease outbreak occurred in the Great Wicomico River in 2008, as a mild winter and a long period of …
Characterization Of A Rediscovered Haplosporidian Parasite From Cultured Penaeus Vannamei, Lm Nunam, Dv Lightner, Cr Pantoja, Na Stokes, Kimberly S. Reece
Characterization Of A Rediscovered Haplosporidian Parasite From Cultured Penaeus Vannamei, Lm Nunam, Dv Lightner, Cr Pantoja, Na Stokes, Kimberly S. Reece
VIMS Articles
Mortalities of Penaeus vannamei, cultured in ponds in Belize, Central America, began during the last part of the grow-out cycle during the cold weather months from September 2004 through February 2005. Tissue squashes of infected hepatopancreata and histological examination of infected shrimp revealed that the mortalities might have been caused by an endoparasite. To confirm the diagnosis, DNA was extracted from ethanol preserved hepatopancreata and the small-subunit rRNA gene was sequenced. The 1838 by sequence was novel and phylogenetic analysis placed the P. vannamei parasite within the phylum Haplosporidia as a sister taxon to a clade that includes Bonamia and …
Status Of The Major Oyster Diseases In Virginia 2005 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2005 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Reports
More normal riverflows and salinities returned in 2005 after two very wet years. Temperatures were somewhat colder than normal during the winter, and warmer during the summer. The physical environment was generally more favorable for parasite activity, and thus brought a slight increase in prevalence and intensity of the oyster diseases caused by Perkinsus marinus (Dermo) and Haplosporidium nelsoni (MSX). Among quarterly James River Survey sites, maximum annual P. marinus prevalences returned to levels typical of the mid- 1990s, before the years of drought. P. marinus prevalence reached 92% at Wreck Shoal, 56% at Point of Shoal, 68% at Horsehead …
Mycobacterial Infections In Striped Bass (Morone Saxatilis) From Delaware Bay, Christopher A. Ottinger, J. Jed Brown, Et Al, Martha Rhodes, Howard Kator, David T. Gauthier, Wolfgang K. Vogelbein
Mycobacterial Infections In Striped Bass (Morone Saxatilis) From Delaware Bay, Christopher A. Ottinger, J. Jed Brown, Et Al, Martha Rhodes, Howard Kator, David T. Gauthier, Wolfgang K. Vogelbein
VIMS Books and Book Chapters
Much of what is known of mycobacteriosis in wild striped bass from the mid-Atlantic region of the United States is based on our observations from Chesapeake Bay and its tributaries, where high infection prevalence and lesioned fish are frequently observed. Comparatively, the occurrence and severity of mycobacteriosis in striped bass from watersheds adjacent to Chesapeake Bay are relatively unknown. This study represents the first report on mycobacterial infection in striped bass harvested from two sites in Delaware Bay.
Epizootic Mycobacteriosis In Chesapeake Bay Striped Bass: What Is The Fate Of Infected Fish?, Wolfgang K. Vogelbein, John M. Hoenig, David T. Gauthier
Epizootic Mycobacteriosis In Chesapeake Bay Striped Bass: What Is The Fate Of Infected Fish?, Wolfgang K. Vogelbein, John M. Hoenig, David T. Gauthier
VIMS Books and Book Chapters
Striped bass (Morone saxatilis) in Chesapeake Bay, USA, are currently experiencing an epizootic of mycobacteriosis. Visceral disease prevalence in resident fish exceeds 50% and prevalence of skin ulcers can exceed 30% in some areas. Two primary hypotheses regarding emergence of this chronic bacterial disease propose that anthropogenic stressors constitute important underlying modulating factors
The Ecology Of Mycobacteria Infecting Striped Bass (Morone Saxatilis) In Chesapeake Bay: A Research Plan, Howard Kator, Martha Rhodes, David Gauthier
The Ecology Of Mycobacteria Infecting Striped Bass (Morone Saxatilis) In Chesapeake Bay: A Research Plan, Howard Kator, Martha Rhodes, David Gauthier
VIMS Books and Book Chapters
The ecology of mycobacteria in estuarine and marine waters remains poorly understood. The current epizootic in Chesapeake Bay striped bass and newly described pathogens Mycobacterium shottsii and M. pseudoshottsii raise ecological questions that if answered can improve our understanding of the pathogenesis of mycobacteriosis in this fish species.
Epizootiology Of Mycobacteriosis In Chesapeake Bay Striped Bass (Morone Saxatilis): Large-Scale Field Survey, David T. Gauthier, Robert Latour, Wolfgang K. Vogelbein
Epizootiology Of Mycobacteriosis In Chesapeake Bay Striped Bass (Morone Saxatilis): Large-Scale Field Survey, David T. Gauthier, Robert Latour, Wolfgang K. Vogelbein
VIMS Books and Book Chapters
Striped bass in Virginia and Maryland waters of Chesapeake Bay are experiencing an ongoing epizootic of mycobacteriosis. Visceral disease prevalence exceeding 50% has been reported in several locations by various authors, and skin lesion prevalence exceeding 30% has been observed. The high prevalence of skin lesions observed in Chesapeake Bay striped bass is unusual and has not, to our knowledge, been reported previously in wild fishes.
Role Of Apolipoprotein A-1 In Defense Against Bacteria By Striped Bass (Morone Saxatilis), L. Danielle Johnston
Role Of Apolipoprotein A-1 In Defense Against Bacteria By Striped Bass (Morone Saxatilis), L. Danielle Johnston
Dissertations, Theses, and Masters Projects
No abstract provided.
Status Of The Major Oyster Diseases In Virginia 2004 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2004 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Eugene M. Burreson
Reports
2004 was the second very wet year in a row. While rainfall and streamflows were normal in winter and early spring, and just slightly above average during the summer, the fall of 2004 was nearly as wet as the year before. Salinities were again depressed throughout the lower Bay. Water temperatures were below normal during the winter, but typical otherwise. Low salinities and, in the winter, temperatures brought continued abatement in the oyster diseases caused by Perkinsus marinus (Dermo) and Haplosporidium nelsoni (MSX). Among quarterly James River Survey sites, maximum annual P. marinus prevalences were the lowest they had been …
Status Of The Major Oyster Diseases In Virginia 2003 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2003 A Summary Of The Annual Monitoring Program, Ryan Carnegie, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
Low temperatures and salinities brought abatement in the oyster diseases caused by Perkinsus marinus (Dermo) and Haplosporidium nelsoni (MSX) for the first time since 1998. In the James River, P. marinus prevalences were the lowest they had been since 1998. In summer and fall, when P. marinus is normally most prevalent, it was found in a maximum of 72% of oysters at Wreck Shoal and in less than half the oysters at Horsehead Rock and Point of Shoals. Advanced infections were very rare. Haplosporidium nelsoni had disappeared completely from quarterly James River samples by July
Status Of The Major Oyster Diseases In Virginia 2002 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2002 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
Samples collected monthly from the upper James River sites from January through May showed a decline in P. marinus prevalence during the 4 winter and spring following a typical annual pattern; however, annual minimums were atypically high, particularly at Point of Shoals and Wreck Shoal (12-44%). Unusually high salinity conditions and warm winter temperatures promoted high overwintering survival of the pathogen and an early onset of the disease in the summer months. Perkinsus marinus prevalence increased to 100% at all four of the upper river stations and record high infection intensities were observed at Deepwater Shoal and Horsehead Rock. It …
Status Of The Major Oyster Diseases In Virginia 2001 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2001 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
Thirty-nine oyster populations were surveyed for disease in fall 2001. Perkinsus marinus was found in all areas sampled and prevalence exceeded 90% at all but 5 sample locations. In the James River P. marinus prevalence ranged from 88-100% at Deepwater Shoal, Horsehead Rock, Point of Shoals, Wreck Shoal, Mulberry Point, Swash, Long Shoal, and Dry Shoal. A lower prevalence was observed down river at Thomas Rock, 72%, and at Nansemond Ridge, 12%. The extremely low prevalence at Nansemond Ridge is likely age and density related; the oyster population was primarily comprised of spat; few small to market oysters were present …
Status Of The Major Oyster Diseases In Virginia 2000 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 2000 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
As a consequence of the relatively warm temperatures, high salinities, and high oyster parasite abundances in the fall of 1999, both P. marinus and H. nelsoni were widely distributed throughout oyster populations in Virginia in 2000. Fortunately, however, we did not see severe epizootics of the diseases as observed in some areas in 1999.
Status Of The Major Oyster Diseases In Virginia 1999 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 1999 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
As a consequence of the relatively warm temperatures and high salinities severe epizootics of both H. nelsoni and P. marinus occurred in most tributaries in VA. In the upper James River, VA prevalences and intensities of P. marinus were the highest on record. The proportion of advanced infections (moderate and heavy intensity) in October was 60% at Wreck Shoal and 48% at Horsehead Rock suggesting that significant oyster mortalities occurred in these areas. 1 Record high levels of P. marinus were also observed in Virginia's other major tributaries. Of the 39 bay oyster populations surveyed in the fall, P. marinus …
Status Of The Major Oyster Diseases In Virginia 1998 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 1998 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
No abstract provided.
Potential Role Of Protease-Antiprotease Interactions In Perkinsus Marinus Infection In Crassostrea Spp., M Faisal, Jl Oliver, Sl Kaataari
Potential Role Of Protease-Antiprotease Interactions In Perkinsus Marinus Infection In Crassostrea Spp., M Faisal, Jl Oliver, Sl Kaataari
VIMS Articles
Perkinsus marinus causes devastating losses in populations of the eastern oyster (Crassostrea virginica). Our studies have demonstrated that P. marinus secretes extracellular serine proteases which enhance parasite propagation and compromise host defences. Crassostrea virginica. however, possesses several inhibitors of these proteases. The Pacific oyster (C. gigas) is resistant to P. marinus and possesses protease inhibitors with significantly higher specific activities than those in C. virginica. Interestingly, Crassostrea spp. themselves, elaborate metalloprotease activities which can be detected in their plasma, and are increased during P. marinus infections. Together our work suggests that there may be a broad spectrum of humoral host …
Environmental Factors And The Infectious Disease Caused By The Protozoan Parasite, Perkinsus Marinus, In Eastern Oysters (Crassostrea Virginica), Fle Chu
VIMS Articles
Temperature and salinity are two important factors limiting the distribution and abundance of Perkinsus marinus, a protozoan parasite of Eastern oysters (Crassostrea virginica). Results of laboratory studies ale consistent with field observations and clearly demonstrate that P. marinus susceptibility and disease advancement are positively correlated with temperature, salinity and in situ number of infective cells. Laboratory findings also suggest that environmental degradation may enhance the epizootic, although disease caused by P. marinus in oysters is known to be predominantly exacerbated by elevated temperature and salinity. Oysters cellular defence mechanisms appear ineffective in defence against P. marinus. Also, pollutant esposure caused …
Histopathological Alterations Associated With Perkinsus Spp. Infection In The Softshell Clam Mya Arenaria, Sm Mclaughlin, M Faisal
Histopathological Alterations Associated With Perkinsus Spp. Infection In The Softshell Clam Mya Arenaria, Sm Mclaughlin, M Faisal
VIMS Articles
Softshell clams (Mya arenaria) collected from the Chester River in the upper Chesapeake Bay showed the presence of Perkinsus spp, in similar to 12 % (28/240) Of clams examined. The infection seems to run a mild course with the host prevailing in encapsulating invading parasites. The gills appear to be the major site of infection, however, the parasite was also found in the digestive gland, gonads, and kidneys and occasionally in the tissue and sinuses of adductor muscles. Typically, clusters of protozoal cells were embedded in on amorphous PAS-positive substrate and were surrounded by one or more layers of granulocytes. …
Status Of The Major Oyster Diseases In Virginia 1997 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 1997 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
No abstract provided.
In Vitro Propagation Of Two Perkinsus Species From The Softshell Clam Mya Arenaria, Sm Mclaughlin, M Faisal
In Vitro Propagation Of Two Perkinsus Species From The Softshell Clam Mya Arenaria, Sm Mclaughlin, M Faisal
VIMS Articles
Two continuous, axenic cultures of Perkinsus spp. (H49 and G117)were obtained from the softshell clam Mya arenaria collected from Swan Point in the Chester River, Chesapeake Bay (Maryland).
Isolate H49 was obtained from the hemolymph of a heavily infected clam. Except for their larger size, H49 trophozoites and schizonts exhibited the characteristic morphology of Perkinsus marinus and divided by schizogony. Isolate G117 was obtained from a combined gill/palp sample of a moderately infected clam. Unlike H49, vegetative forms (trophozoites and schizonts) of G117 were present along with prezoosporulation stages in the same culture. In culture, G117 cells multiplied by both …
Status Of The Major Oyster Diseases In Virginia 1996 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 1996 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
No abstract provided.
Status Of The Major Oyster Diseases In Virginia 1995 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia 1995 A Summary Of The Annual Monitoring Program, Lisa M. Ragone Calvo, Eugene M. Burreson
Reports
No abstract provided.