Life Sciences Commons^™

A Stock Assessment Program For Chesapeake Bay Fisheries: Development Of An Alosa Juvenile Index Of Abundance: Annual Report 1991, Douglas A. Dixon, Joseph G. Loesch

Reports

This presentation is the annual report for Contract No. NA17FUO196-0l "A Stock Assessment Program for Chesapeake Bay Fisheries: Development of an Alosa Juvenile Index of Abundance," for the period 1 May 1991 to 31 May 1992. The fishes of concern were the alewife (Alosa pseudoharengus), American shad (& sapidissima), and the blueback herring (A. aestivalis).

Increased Reactive Oxygen Intermediate Production By Hemocytes Withdrawn From Crassostrea Virginica Infected With Perkinsus Marinus, Rs Anderson, Ky Paynter, Em Burreson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 …

Groundsel Tree, Salt Bush, Silvering, Sea Myrtle Baccharis Halimifolia L., Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen identification.

Marine Resource Bulletin Vol. 24, No. 3 & 4, Virginia Sea Grant, Virginia Institute Of Marine Science

Virginia Marine Resource Bulletin

Contents

Introduction

How is Seafood Inspected?

HACCP

Virginia's Shellfish Inspection Program

Oyster Packing

Oyster Season

Crab Processing

Fish Processing

Quality Control in the Home

For Commercial/Recreational Fishermen

Fish House Kitchen

Big Cordgrass, Giant Cordgrass Spartina Cynosuroides (L.) Roth, Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen identification.

School Of Marine Science Graduate Catalog 1992-93, College Of William And Mary, School Of Marine Science

Miscellaneous

Catalog for the Graduate program of the School of Marine Science at the College of William & Mary for the listed academic year.

An Analysis Of The Legal And Regulatory Status Of The Northeast United States Oyster Industry, W. Barlett Theberge, Et Al

Reports

The purpose of this study was to provide a legal/regulatory profile of the current oyster industry in the northeast region of the United States.

Bultongue Coastal Arrowhead Sagittaria Falcata Pursh, Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen identification.

A Comparative Study Of Dry Weight Measurements Of Oyster Soft Tissue, Cheol Mo, Bruce Neilson

Reports

Four alternative drying methods for oyster soft tissue were compared: oven drying at 105, 100 and 80°C and freeze drying. Weights were recorded every 12 hours for 5 days, and after sample treatments were switched, every 24 hours for another 3 days. The time required for all of the oysters in a treatment to reach constant weight were 36, 36, 60, and 120 hours for the 105, 100, 80°C ovens and freeze drier respectively. Within a treatment, the time for an individual oyster to reach constant weight was not related to that weight. For oven drying, drying was rapid and …

A Rapid Chromatographic Method For Recovery Of 15no2- And No3- Produced By Nitrification In Aqueous Samples, H Kator, Lj Morris, Rl Wetzel

VIMS Articles

The sensitivity and comparative simplicity of N-15 stable isotopic tracer techniques has been used to quantify rates of nitrification in aquatic systems. However, the most commonly used method for recovery of inorganic oxidized nitrogen compounds from aqueous samples, which is based on liquid-liquid partitioning, is time consuming and contamination prone. We describe a solid-phase rapid chromatographic method for recovery of (NO2-)-N-15 and NO3- produced by nitrification in aqueous samples. Compared to liquid-liquid partitioning, the advantages are significantly reduced processing time and reduced potential for contamination. Typical results are presented for the tidal, freshwater reaches of the James River estuary.

Public Oyster Shoal Survey - Spring 1992, Bruce J. Barber

Reports

Oysters have been harvested from Virginia waters as long as humans have inhabited the area. Depletion of natural stocks in the late 1880's led to the establishment of regulations by public fisheries agencies. A survey of bottom areas in which oysters grew naturally was completed in 1896 under the direction of Lt. Baylor, USN. These areas (over 243,000 acres) were set aside by legislative action for public use and have come to be known as the Baylor Survey Grounds or Public Oyster Grounds of Virginia, and are presently administered by VMRC, the Virginia Marine Resources Commission (Haven et al., 1978). …

Shelter Selection By Spiny Lobster Under Variable Predation Risk, Social Conditions, And Shelter Size, Db Eggleston, Rom Lipcius

VIMS Articles

Shelter use patterns of den dwelling Caribbean spiny lobster, Panulirus argus, appear to be regulated by predation risk. The risk of predation may be modified by (1) social structure, which alters the effectiveness of communal defense, and (2) the scaling between lobster size and shelter size, which enhances the protective capacity of the den. These hypotheses were tested with field enclosure experiments using artificial lobster shelters, which examined the effects of predation risk (i.e., presence or absence of a major predator, the nurse shark Ginglyostoma cirratum), spiny lobster size, social condition (i.e., presence or absence of conspecifics), and shelter size …

Estimation Of Relative Abundance Of Recreationally Important Finfish In The Virginia Portion Of Chesapeake Bay: Annual Progress Report 1991-1992, James A. Colvocoresses, Patrick J. Geer, Christopher F. Bonzek

Reports

Provisional annual indices of juvenile abundance have been generated from trawl survey data for five species of key recreational importance in the Virginia portion of Chesapeake Bay (spot, croaker, weakfish, summer flounder and black sea bass) and one species of secondary importance (scup) for the period 1988-1991. Only summer flounder catches resulted in an index that showed a consistent (upward) trend over the four years sampled, but the maximal value recorded for 1991 (2.8) was not statistically significantly higher than the prior year, in contrast to the previous increases observed. Atlantic croaker showed the greatest variability between years, with the …

A Report On The Field Investigation Into Commercial Potential Of The Patagonian Scallop, Chlamys Sp. Off Uruguay, William D. Dupaul, Ronald J. Smolowitz

Reports

BIVAR SA initiated exploratory fishing on a Patagonian scallop bed off the coast of Uruguayo Preliminary indications are that a fishery can be developed, initially on the scale of two to four small vessels. Careful monitoring of the fishery while it being conducted, as well as additional explorations, will determine the lity of the need for a for the The economics to be the The meat count of the scallops produced in may range somewhere between 185-222/kg (85-100/lb.) if small scallops and pieces are removed.

Potomac River White Perch, Marone Americana, Gill Net Study 10-12 March, 1992, Herbert M. Austin

Reports

No abstract provided.

Swamp Milkweed Asclepias Incarnata L., Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen identification.

Good Manufacturing Practices For The Harvesting And Processing Of Sea Scallops (Placopecten Magellanicus), William D. Dupaul, Robert A. Fisher, Thomas Rippen

Reports

No abstract provided.

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.

Marine Resource Bulletin Vol. 24, No. 1 & 2, Virginia Sea Grant, Virginia Institute Of Marine Science

Virginia Marine Resource Bulletin

Contents

Introduction

About the Benthos

Habitat Disruption

Budgeting the Benthos

Management Implications

The Oyster Bar

The Plight of Crassostrea virginica

gigas versus virginica

Environmental Stress = Disease Susceptibility??

Environmental Effects Studies

Mercenaria mercenaria

A Not Entirely Sedentary Existence

For the Recreational/Commercial Fisherman

Marine Notes

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 Two Methods Of Measuring Dissolved Organic Carbon, Betty Saley, Kevin Curling, Bruce Neilson

Reports

No abstract provided.

Halbred-Leaved Tearthumb, Hastate-Leaved Tearthumb Polygonum Arifolium L., Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen identification.

Measurement Of Marine Picoplankton Cell-Size By Using A Cooled, Charge-Coupled Device Camera With Image-Analyzed Fluorescence Microscopy, Cl Viles, Me Sieracki

VIMS Articles

Accurate measurement of the biomass and size distribution of picoplankton cells (0.2 to 2.0-mu-m) is paramount in characterizing their contribution to the oceanic food web and global biogeochemical cycling. Image-analyzed fluorescence microscopy, usually based on video camera technology, allows detailed measurements of individual cells to be taken. The application of an imaging system employing a cooled, slow-scan charge-coupled device (CCD) camera to automated counting and sizing of individual picoplankton cells from natural marine samples is described. A slow-scan CCD-based camera was compared to a video camera and was superior for detecting and sizing very small, dim particles such as fluorochrome-stained …

Status Of The Major Oyster Diseases In Virginia 1991 A Summary Of The Annual Monitoring Program, Eugene M. Burreson

Reports

No abstract provided.

A Stock Assessment Program For Chesapeake Bay Fisheries: Development Of An Alosa Juvenile Index Of Abundance: Annual Report 1990, Douglas A. Dixon, Joseph G. Loesch

Reports

This presentation is the annual report for Contract No. NA90AA-H-SF671 "A Stock Assessment Program for Chesapeake Bay Fisheries: Development of an Alosa Juvenile Index of Abundance," for the period 15 June 1990 to 31 July 1991. The fishes of concern were the alewife (Alosa pseudoharengus), American shad (A. sapidissima), and the blueback herring (A. aestivalis).

The abundance of the Alosa stocks, once an important component of the landings of Virginia fisheries, have dramatically decreased in the last decade. The 1981 landings of Alosa species in Virginia were the lowest ever recorded. American shad and river herring are also pursued by …

Allozyme Analysis Of Billfish Population Structure, Lee W. Morgan

Dissertations, Theses, and Masters Projects

No abstract provided.

Adaptive Significance Of Ray Florets In Asteraceae, Gail Taber Steele

Dissertations, Theses, and Masters Projects

No abstract provided.

Survival Of Juvenile Queen Conch, Strombus Gigas, In Natural Habitats: Impact Of Prey, Predator And Habitat Features, Livingston Sinclair Marshall Jr

Dissertations, Theses, and Masters Projects

In this dissertation, I experimentally examine predation-induced mortality upon juvenile queen conch, Strombus gigas, and assess the importance of select habitat predator and conch characteristics affecting predation intensity. Experiments were conducted during the summer and early fall of 1987, 1988, 1990 and 1991 in seagrass beds and adjacent sand flats near Lee Stocking Island, Exuma Cays, Bahamas. These experiments indicate that various factors act interactively to produce habitat-specific mortality rates in queen conch due to predation. These include (1) habitat type, whereby seagrass beds offer some protection; (2) local population dynamics, such that populated seagrass beds appear to enhance conch …

The Phylum Chaetognatha : A Bibliography, Grant C. George

Reports

This bibliography has resulted from an initial suggestion by Sargay Timofeev in the March 1990 newsletter of The Chaetognath Group, whose coordinator (Helga Kapp) further suggested that I be given the task. Both are forgiven. The eventual size of the task was unsuspected at its beginning in the fall of 1990; bibliographies are easily begun but decisions on their limits and conclusion are difficult. I have attempted to include all major and substantive works on the Chaetognatha. The inevitable omissions are inadvertent, although a recognized deficiency of the work lies in an incomplete listing of Russian references; I have included …

Photosynthetic Responses Of Eelgrass (Zostera Marina L) To Light And Sediment Sulfide In A Shallow Barrier Island Lagoon, Jill Lynn Goodman

Dissertations, Theses, and Masters Projects

No abstract provided.