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Articles 1 - 12 of 12
Full-Text Articles in Life Sciences
Increased Reactive Oxygen Intermediate Production By Hemocytes Withdrawn From Crassostrea Virginica Infected With Perkinsus Marinus, Rs Anderson, Ky Paynter, Em Burreson
Increased Reactive Oxygen Intermediate Production By Hemocytes Withdrawn From Crassostrea Virginica Infected With Perkinsus Marinus, Rs Anderson, Ky Paynter, Em Burreson
VIMS Articles
Perkinsus marinus is a protozoan parasite responsible for a major infectious disease of the Eastern oyster, Crassostrea virginica. Nonspecific immunity was assayed in oysters with known intensities of infection so that the physiological responses of the host elicited by the parasite could be better understood. This report describes the capacity of hemocytes to generate reactive oxygen intermediates during the progression of the disease. The hemocytes constitute the major internal defense effector system of oysters, and cytotoxic oxygen species are thought to play central roles in antimicrobial activities of hemocytes and other phagocytic cells. Production of oxyradicals by both resting and …
Effects Of Hypoxia And Anoxia On Larval Settlement, Juvenile Growth, And Juvenile Survival Of The Oyster Crassostrea Virginica, Sm Baker, Roger L. Mann
Effects Of Hypoxia And Anoxia On Larval Settlement, Juvenile Growth, And Juvenile Survival Of The Oyster Crassostrea Virginica, Sm Baker, Roger L. Mann
VIMS Articles
The effects of hypoxia and anoxia on oyster (Crassostrea virginica) larval settlement, juvenile growth, and juvenile survival were studied. Settlement was reduced significantly (P < 0.05) in hypoxic treatments, as compared to normoxic treatments , and almost no settlement took place in anoxic treatments. After 96 h, 38% and 4% of the larvae placed in hypoxic and anoxic treatments had settled, while 79% settled in normoxic treatments. In the first 144 h after settlement, juveniles in hypoxic treatments grew one third as much as those in normoxic treatments, while juveniles in anoxic treatments did not grow at all. Median mortality times of recently settled juveniles in hypoxic and anoxic treatments were 131 h and 84 h, respectively. We conclude that hypoxic and anoxic waters have potentially detrimental effects on oyster settlement and recruitment.
Oligomer Composition And Oxygen Binding Of The Hemocyanin Of The Blue Crab Callinectes Sapidus, Cp Mangum, J Greaves, Js Rainer
Oligomer Composition And Oxygen Binding Of The Hemocyanin Of The Blue Crab Callinectes Sapidus, Cp Mangum, J Greaves, Js Rainer
VIMS Articles
In the blue crab, the ratio of hexamers to dodecamers of the O2 carrier hemocyanin varies in natural populations. Isolated dodecamers have a lower O2 affinity and greater cooperativity than isolated hexamers. The difference in O2 binding can also be resolved in native mixtures that differ in polymer composition. A high content of dodecamers in native mixtures is, in fact, correlated with the presence of an invariant polypeptide chain that is believed to link two hexamers to form dodecamers. On the other hand, the content of a variable chain that has been postulated to play a role in hexamer pairing …
A Comparison Of Methods For Calculating Condition Index In Eastern Oysters Crassostrea Virginica (Gmelin, 1791), Julia S. Rainier, Roger L. Mann
A Comparison Of Methods For Calculating Condition Index In Eastern Oysters Crassostrea Virginica (Gmelin, 1791), Julia S. Rainier, Roger L. Mann
VIMS Articles
A number of techniques have been reported to estimate condition index in oysters and other bivalve molluscs. We report and compare condition index, estimated by three different methods, for oysters collected from a single reef in the James River, Virginia over a four week period in the summer of 1987. Two indices express condition as a ratio of dry meat weight to shell cavity volume, but differ in methods of estimating shell cavity volume. A third method expresses condition as a ratio of dry meat weight to dry shell weight. Within the size range 36-96 mm length there is no …
Age, Growth, And Reproduction Of The Goosefish Lophius-Americanus (Pisces, Lophiiformes), Michael P. Armstrong, John Musick, James A. Colvocoresses
Age, Growth, And Reproduction Of The Goosefish Lophius-Americanus (Pisces, Lophiiformes), Michael P. Armstrong, John Musick, James A. Colvocoresses
VIMS Articles
Age, growth, and reproduction were studied in goosefish Lophius americanus collected from National Marine Fisheries Service groundfish surveys and commercial fishing cruises between Georges Bank and Cape Hatteras in the western North Atlantic. Age and growth of L. americanus were determined from vertebral annuli, which became visible at the edge of the vertebral centra in May. Maximum ages of males and females were 9 and 11 years, respectively. Males appeared to experience higher mortality than females in the older age-classes. Von Bertalanffy growth curves calculated for males and females had excellent agreement with back-calculated lengths. The growth rate of L. …
Unexplained Mortalities Of Hatchery-Reared, Juvenile Oysters, Crassostrea Virginica (Gmelin), Vm Bricelj, Se Ford, Fj Borrero, Fo Perkins, Et Al
Unexplained Mortalities Of Hatchery-Reared, Juvenile Oysters, Crassostrea Virginica (Gmelin), Vm Bricelj, Se Ford, Fj Borrero, Fo Perkins, Et Al
VIMS Articles
Survival. growth and pathology of juvenile oysters. Crassostrea virginica. in off-bottom culture at Oyster Bay and Fishers Island, New York, were monitored during the summer of 1991 to document and help explain the episodic mass mortalities of cultured seed oysters that have occurred in the northeastern USA over the past several years. Al Oyster Bay. where the more detailed study was conducted. 54 to 7So/o losses affected several 1991 cohorts at mean shell heights ranging from IS to 24 mm, within 3 to 6V, weeks of transfer from the hatchery to growout trays. Mortalities occurred in July and August, at …
Index Of Papers Published In The Journal Of Shellfish Research Volume 1-10 (1981-1991), Michael Castagna, Nancy Lewis, Charles Mcfadden, Mary Gibbons
Index Of Papers Published In The Journal Of Shellfish Research Volume 1-10 (1981-1991), Michael Castagna, Nancy Lewis, Charles Mcfadden, Mary Gibbons
VIMS Articles
No abstract provided.
Artificial Shelters And Survival Of Juvenile Caribbean Spiny Lobster Panulirus-Argus - Spatial, Habitat, And Lobster Size Effects, David B. Eggleston, Rom Lipcius, Dl Miller
Artificial Shelters And Survival Of Juvenile Caribbean Spiny Lobster Panulirus-Argus - Spatial, Habitat, And Lobster Size Effects, David B. Eggleston, Rom Lipcius, Dl Miller
VIMS Articles
A principal mechanism underlying a production hypothesis that artifical reefs increase environmental carrying capacity and eventually the biomass of reef-associated organisms is that these structures reduce predation on reef residents. We tested this predation mechanism with a series of field experiments at two sites (inner-bay sand-seagrass flat, and outer-bay seagrass bed adjacent to coral reefs) in Bahia de la Ascension, Mexico. We examined survival of two size-classes of juvenile Caribbean spiny lobster Panulirus argus tethered in seagrass beds with and without access to artificial lobster shelters, and at different distances from the shelters. The artificial shelters were concrete structures (casitas) …
Stock Structure Of The Bluefish Pomatomus-Saltatrix Along The Mid-Atlantic Coast, John Graves, Jan Mcdowell, Ana M. Beardsley, Daniel Scoles
Stock Structure Of The Bluefish Pomatomus-Saltatrix Along The Mid-Atlantic Coast, John Graves, Jan Mcdowell, Ana M. Beardsley, Daniel Scoles
VIMS Articles
Restriction-fragment length polymorphism analysis of mitochondrial DNA (mtDNA) was used to investigate the genetic basis of stock structure of the bluefish Pomatomus saltatrix along the U. S. mid-Atlantic coast, and to determine the degree of genetic differentiation between mid-Atlantic bluefish and Australian conspecifics. A total of 472 young-of-the-year (YOY) and yearling bluefish collected in New Jersey, Virginia, and North Carolina over a period of 3 years, and 19 YOY bluefish collected in New South Wales, Australia were analyzed with 9 informative restriction endonucleases. Despite considerable mtDNA variation within samples of U.S. mid-Atlantic bluefish, no significant genetic differentiation was detected among …
A Genetic-Analysis Of Weakfish Cynoscion-Regalis Stock Structure Along The Mid-Atlantic Coast, John Graves, Jan Mcdowell, M. Lisa Jones
A Genetic-Analysis Of Weakfish Cynoscion-Regalis Stock Structure Along The Mid-Atlantic Coast, John Graves, Jan Mcdowell, M. Lisa Jones
VIMS Articles
To investigate the genetic basis of stock structure of the weakfish Cynoscion regalis, a total of 370 individuals was collected from four geographic sites along the mid-Atlantic coast of the United States over a period of 4 years. Restriction fragment length polymorphism (RFLP) analysis of weakfish mitochondrial DNA, employing either 6 or 13 restriction endonucleases, demonstrated a low level of intraspecific mtDNA variation, with a mean nucleotide sequence divergence of 0.13% for the pooled samples. The common mtDNA genotype occurred at a frequency of 0.91-0.96 in all samples, and no significant heterogeneity was found among samples in the occurrence of …
Temporal And Spatial Changes In Fecundity Of Eastern Oysters, Crassostrea Virginica (Gmelin, 1791) In The James River, Virginia, Carrollyn Cox, Roger L. Mann
Temporal And Spatial Changes In Fecundity Of Eastern Oysters, Crassostrea Virginica (Gmelin, 1791) In The James River, Virginia, Carrollyn Cox, Roger L. Mann
VIMS Articles
A~u1t Crass~strea virgi.nic~ ~Gmelin) were examined during the reproductive season of 1986 to determine temporal and spatial vanation m fecundity among md!Vldual female oysters from four reefs in the James River, Virginia. Sex ratio and oyster abu.ndance were. ~so determined to :acilitate ~s~imation of total reproductive output of oyster assemblages. Fecundity was highly vanable, both w1thm and among locations. Vanation was attributed to differences in oyster size, asynchrony and variation in time since pri~r spawning, prevalence of parasites (especially Haplosporidium nelsoni (MSX) and Perkinsus marinus) and differing salinity regimes.
Comparison Of Condition Index (K) Of Spot (Leiostomus Xanthurus) From The Elizabeth And York Rivers, Virginia, Kinloch Nelson, Herbert M. Austin
Comparison Of Condition Index (K) Of Spot (Leiostomus Xanthurus) From The Elizabeth And York Rivers, Virginia, Kinloch Nelson, Herbert M. Austin
VIMS Articles
Condition Index (K) was measured on spot, Leiostomus xanthums from the York ( control) and Elizabeth rivers (Experimental-polluted) in 1983-1985. Condition indices for the two populations were regressed against seasonal temperature at the time of capture. Between 6.0 and 19.0 C the Condition Index of the two populations rises in synchrony. Above 19 .0 C the Elizabeth River Condition Index continues to rise, and the York begins to drop. Above 26 C the York drops to levels approaching those of winter, and the Elizabeth continues to rise to the highest levels measured. It is hypothesized that this disparity is caused …