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Full-Text Articles in Life Sciences
Exocrine Pancreatic Neoplasms In The Mummichog (Fundulus Heteroclitus) From A Creosote-Contaminated Site, John W. Fournie, Wolfgang K. Vogelbein
Exocrine Pancreatic Neoplasms In The Mummichog (Fundulus Heteroclitus) From A Creosote-Contaminated Site, John W. Fournie, Wolfgang K. Vogelbein
VIMS Articles
A high prevalence of exocrine pancreatic neoplasms occurred in mummichog, Fundulus heteroclitus, from a creosote-contaminated site in the Elizabeth River, Virginia. A total of 20 neoplasms were found in a group of about 1,300 fish obtained at this site over a 2-yr period. Of 240 fish collected during October 1991, 3.3% had pancreatic neoplasms. Adjusted total lesion prevalence for large adult fish (Size Class III: total length = 75–85 mm; Size Class IV: total length > 85 mm) was 6.7%. Pancreatic neoplasms were not observed in 234 fish collected at this site during May 1991, nor were they found in …
In-Vitro And In-Vivo Effects Of 8 Chemotherapeutants On The Oyster Parasite Perkinsus-Marinus (Mackin, Owen, And Collier), Gustavo W. Calvo, Eugene M. Burreson
In-Vitro And In-Vivo Effects Of 8 Chemotherapeutants On The Oyster Parasite Perkinsus-Marinus (Mackin, Owen, And Collier), Gustavo W. Calvo, Eugene M. Burreson
VIMS Articles
Eight therapeutants were tested for in vitro inhibition of Perkinsus marinus (Mackin, Owen, and Collier) enlargement and in vivo control of established infections. In addition, acute toxicity of six anticoccidials to oysters was determined. For in vitro experiments 0.2 ml aliquots of infected hemolymph were exposed to 5 concentrations (100 mg/l, 10 mg/l, 1 mg/l, 0.1 mg/l and 0.01 mg/1) of amprolium, arprinocid, cycloheximide, lasalocid, malachite green, monensin, sulfadimethoxine, and a potentiated sulfadimethoxine. Exposure lasted 1 day and was followed by incubation in fluid thioglycollate medium. Lasalocid and malachite green were the most effective compounds, showing significant anti-P. marinus activity …
Characterization Of Overwintering Infections Of Perkinsus-Marinus (Apicomplexa) In Chesapeake Bay Oysters, Lisa M. Ragone Calvo, Em Burreson
Characterization Of Overwintering Infections Of Perkinsus-Marinus (Apicomplexa) In Chesapeake Bay Oysters, Lisa M. Ragone Calvo, Em Burreson
VIMS Articles
To determine the nature and abundance of over-wintering P. marinus infections, infected oysters (Crassostrea virginica) collected from the upper James River, VA, were placed in a tray and suspended from a pier in the lower York River, VA in November 1991. Every six weeks through May 1992 oysters (n = 25) were removed from the tray, examined for P. marinus by hemolymph culture in fluid thioglycollate medium (FTM), gradually warmed in individual containers to 25-degrees-C and held for one month. After the incubation period, which permitted the development of very light and/or cryptic parasite stages to detectable levels, the oysters …
Growth And Mortality Of Eastern Oysters, Crassostrea-Virginica (Gmelin, 1791), And Pacific Oysters, Crassostrea-Gigas (Thunberg, 1793) Under Challenge From The Parasite, Perkinsus-Marinus, Bruce J. Barber, Roger L. Mann
Growth And Mortality Of Eastern Oysters, Crassostrea-Virginica (Gmelin, 1791), And Pacific Oysters, Crassostrea-Gigas (Thunberg, 1793) Under Challenge From The Parasite, Perkinsus-Marinus, Bruce J. Barber, Roger L. Mann
VIMS Articles
Stocks of oysters Crassostrea virginica and C. gigas were produced in the Virginia Institute of Marine Science (VIMS) hatchery in April 1991 and grown in two quarantined flumes receiving water from the York River, VA. From July 1991 through November 1992, growth and mortality of both species were compared. Also, beginning in June 1992 one flume (containing one group of each species) was ''dosed'' (oysters infected with P. marinus added) and the other flume remained ''undosed'' (no infected oysters added). Disease prevalence and intensity, mortality, and shell height were compared both within (between undosed and dosed groups) and between species. …
Quantifying Seasonal-Variation In Somatic Tissue - Surfclam Spisula-Solidissima (Dillwyn, 1817) - A Case-Study, Joseph G. Loesch, David A. Evans
Quantifying Seasonal-Variation In Somatic Tissue - Surfclam Spisula-Solidissima (Dillwyn, 1817) - A Case-Study, Joseph G. Loesch, David A. Evans
VIMS Articles
Condition indexes are commonly derived from bivalve species. Usable meat yields (UMY, in l/bu) from 181 daily landings of Atlantic surfclams, Spisula solidissima (Dellwyn, 1817), at a Virginia processing plant in 1974 and 160 landings in 1975 were used as an index in our analysis. The data were fitted to a basic sinusoidal model and a two-compartment sinusoidal model to demonstrate the utility of these models for quantifying cyclic events. The basic model, x = x(0) + A cos2 pi t + B sin2 pi t, is linear in its independent variables and fitted by multiple regression, with x = …
Comparison Of Infectivity And Pathogenicity Of Meront (Trophozoite) And Prezoosporangiae Stages Of The Oyster Pathogen Perkinsus-Marinus In Eastern Oysters, Crassostrea-Virginica (Gmelin, 1791), Aswani Volety, Fu-Lin E. Chu
Comparison Of Infectivity And Pathogenicity Of Meront (Trophozoite) And Prezoosporangiae Stages Of The Oyster Pathogen Perkinsus-Marinus In Eastern Oysters, Crassostrea-Virginica (Gmelin, 1791), Aswani Volety, Fu-Lin E. Chu
VIMS Articles
Two experiments were conducted to compare the infectivity and pathogenicity of two life stages of the parasite Perkinsus marinus, meronts (trophozoites) and prezoosporangia (hypnospores), in eastern oysters, Crassostrea virginica. Oysters were inoculated with 5 X 10(4) meronts or prezoosporangia per oyster by injection into the shell cavity. Prevalence and intensity of P. marinus infections, condition index, serum protein concentrations, and lysozyme activities were measured in oysters after 15, 25, 40, and 65 days in experiment 1 and after 20, 40, 50, 65, and 75 days postchallenge by P. marinus cells in experiment 2. Controls were injected with filtered York River …