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Articles 31 - 48 of 48
Full-Text Articles in Life Sciences
Effects Of Perkinsus Marinus Infection In The Eastern Oyster, Crassostrea Virginica: I. Susceptibility Of Native And Msx-Resistant Stocks, Eugene Burreson
Effects Of Perkinsus Marinus Infection In The Eastern Oyster, Crassostrea Virginica: I. Susceptibility Of Native And Msx-Resistant Stocks, Eugene Burreson
VIMS Articles
A selective breeding program was implemented to attempt to decrease the disease susceptibility of the eastern oyster, Crassostrea virginica, to Perkinsus marinus. Six oyster strains were spawned and the progeny exposed to Haplosporidium nelsoni (MSX) and P. marinus in the lower Chesapeake Bay. Three strains, a Delaware Bay MSX-resistant strain, a Delaware Bay native strain, and a Mobjack Bay native strain (lower Chesapeake Bay) were exposed for three years (1988-90); three other strains, a separate Delaware Bay MSX-resistant strain, a lower James River native strain (lower Chesapeake Bay) and a susceptible control strain, were exposed for two years (1989-90). …
Sterile Triploid Crassostrea Virginica (Gmelin, 1791) Grow Faster Than Diploids But Are Equally Susceptible To Perkinsus Marinus, Bruce J. Barber, Roger L. Mann
Sterile Triploid Crassostrea Virginica (Gmelin, 1791) Grow Faster Than Diploids But Are Equally Susceptible To Perkinsus Marinus, Bruce J. Barber, Roger L. Mann
VIMS Articles
Growth, tolerance of Perkinsus marinus, and gametogenesis of diploid and triploid Eastern oysters, Crassostrea virginica (Gmelin, 1791) were compared in the York River, Virginia between June 1989 and November 1990. Triploid oysters had significantly greater mean shell height (P ,a;; 0.02) and whole weight (P ,a;; 0.005) than diploid oysters throughout the study period. In November 1990, triploids had significantly greater mean dry tissue weight (P ,a;; 0.006) than diploids. On average, triploid oysters reached commercial size (63.5 mm) 5 months before diploid oysters. Diploid and triploid groups became similarly infected with P. marinus during summer 1990. Prevalences reached 96% …
Estimation Of Standing Stock Of Oysters In The James River, Virginia, Using Commercial Fishing Records, Bruce J. Barber, Roger L. Mann
Estimation Of Standing Stock Of Oysters In The James River, Virginia, Using Commercial Fishing Records, Bruce J. Barber, Roger L. Mann
Reports
No abstract provided.
Recruitment And Growth Of Oysters On Shell Clutch Planted At Monthly Intervals (May-August 1986) At Jones Shore Basin The Lower Potomac River, Maryland, Reinaldo Morales-Alamo, Roger L. Mann
Recruitment And Growth Of Oysters On Shell Clutch Planted At Monthly Intervals (May-August 1986) At Jones Shore Basin The Lower Potomac River, Maryland, Reinaldo Morales-Alamo, Roger L. Mann
Reports
No abstract provided.
Recruitment And Growth Of Oysters On Shell Planted At Four Monthly Intervals In The Lower Potomac River, Maryland, Reinaldo Morales-Alamo, Roger L. Mann
Recruitment And Growth Of Oysters On Shell Planted At Four Monthly Intervals In The Lower Potomac River, Maryland, Reinaldo Morales-Alamo, Roger L. Mann
VIMS Articles
Oyster shells were planted on four successive months (May to August 1986) in contiguous plots at Jones Shore Bar in the Potomac River, Maryland, to study the effect of differences in time of cultch planting on settlement and survival of oyster spat. The plots were usually sampled at two-week intervals from time of planting through November, 1986, and once in June, 1987. A massive concentration of the tunicate Molgula manhattensis covered the bottom in all plots within four to six or eight weeks following shell planting. A commercially acceptable number of spat per shell, between 1.8 and 2.2 (approximately equivalent …
Seed Oysters Stressed By Low Spring Salinities In Virginia, Dexter Haven, Jay Andrews
Seed Oysters Stressed By Low Spring Salinities In Virginia, Dexter Haven, Jay Andrews
Reports
No abstract provided.
The James River Public Seed Oyster Area In Virginia (A Review Of 22 Years Of Setting And Population Studies, 1946 To 1967 And Changes Caused By Minchinia Nelsoni (Msx) After 1960), Jay D. Andrews
Reports
The seed-oyster area is located in a low-salinity sector of the James River where seasonal riverflows and resulting salinities vary widely. Low spring salinities, usually below 10 °/oo in April or May, eliminate most predators and diseases. Prior to 1960, spatfalls were regular and moderate in intensity each year. High quality seed oysters 2 to 3 inches in size were produced with 1000 to 2000 thick-shelled oysters per bushel for use by private-ground planterH. Following the advent of M. nelsoni (MSX) in Chesapeake Bay in 1959:, setting declined to about one-tenth previous levels and there were spatfall failures in many …
Epizootiology Of Late Summer And Fall Infections Of Oysters By Haplosporidium Nelsoni, And Comparisons To Annual Life Cycle Of Haplosporidium Costalis, A Typical Haplosporidan, J. D. Andrews
VIMS Articles
The two haplosporidan parasites that cause diseases of oysters along the middle North Atlantic coast of North America differ in their habitats, in timing of oyster mortalities, and in their adaptations to the host. Haplosporidium nelsoni (MSX) kills oysters throughout the year over a wide range of salinities (about 15 to 30 ppt). It has a long infective period of nearly 6 months. This pathogen rarely completes sporulation in its life cycle in oysters. It is highly pathogenic and exhibits irregular activity suggesting that it is poorly adapted to the host species. In contrast, Haplosporidium costalis (SSO) has a short, …
Potential Effects Of The 1980-81 Drought On Oyster Diseases And Predators, J. D. Andrews
Potential Effects Of The 1980-81 Drought On Oyster Diseases And Predators, J. D. Andrews
Reports
No abstract provided.
Perkinsus Marinus = Dermocystidium Marinum ("Dermo") In Virginia, 1950-1980 : A Record Of Fluid Thioglycollate Tests For Dermo In Oysters From Public And Private Oyster Beds, And From Trays Of Disease-Free Oysters Transplanted To Areas Where Msx And Dermo Are Endemic, Jay D. Andrews
Reports
No abstract provided.
A Report To The Oyster Industry Of Virginia On The Biology And Management Of The Cownose Ray (Rhinoptera Bonasus, Mitchill) In Lower Chesapeake Bay, John V. Merriner, Joseph W. Smith
A Report To The Oyster Industry Of Virginia On The Biology And Management Of The Cownose Ray (Rhinoptera Bonasus, Mitchill) In Lower Chesapeake Bay, John V. Merriner, Joseph W. Smith
Reports
The purpose of this report is to: (1) suggest reasons for the recently observed cownose ray predation on Rappahannock River oyster beds and the apparent increased abundance of the ray, and (2) recommend short- and long-term methods to control and/or manage cownose ray predation on commercially important sh1ellfish beds.
The Oyster Industry Of Virginia: It's Status, Problems, And Promise, Dexter Stearns Haven, William J. Hargis Jr., Paul Charles Kendall
The Oyster Industry Of Virginia: It's Status, Problems, And Promise, Dexter Stearns Haven, William J. Hargis Jr., Paul Charles Kendall
Reports
A short presentation of an exhaustive, multi-volume work on the history and current condition of the oyster industry of the Commonwealth' by the same authors.
Manual For Design And Operation Of An Oyster Seed Hatchery, John L. Dupuy, Nancy T. Windsor, Charles E. Sutton
Manual For Design And Operation Of An Oyster Seed Hatchery, John L. Dupuy, Nancy T. Windsor, Charles E. Sutton
Reports
No abstract provided.
Shell Bags For Catching Oyster Spat, Dexter Haven, David Garten
Shell Bags For Catching Oyster Spat, Dexter Haven, David Garten
Reports
No abstract provided.
Cultchless Seed Oysters, J. D. Andrews, Lawrence W. Mason
Cultchless Seed Oysters, J. D. Andrews, Lawrence W. Mason
Reports
No abstract provided.
The Adventures Of Little Oyster, Revised Edition, Robert S. Bailey, Fred C. Biggs
The Adventures Of Little Oyster, Revised Edition, Robert S. Bailey, Fred C. Biggs
Reports
First published in 1955.
Effects Of River Flow Regulation By Salem Church Dam On Marine Organisms, J. D. Andrews
Effects Of River Flow Regulation By Salem Church Dam On Marine Organisms, J. D. Andrews
Reports
This report is concernen primarily with the effects on oysters and some of their associates of hydrographic changes that would be caused by the dam. Other marine organisms are certain to be affected in ways only vaguely preceived at present. The distribution and activity of oyster drills and certain diseases of oysters, such as those caused by MSX and Dermocystidium, are regulated annually or at intervals of several years by low spring salinities and high summer and fall salinities.
The Adventures Of Little Oyster, Robert S. Bailey