Life Sciences Commons^™

Filtration By Oysters : Interactive Effects Of Water Flow, Seston Composition And Filtration Rate, Mark W. Luckenbach, Deborah A. Harsh, Roger L. Mann, R J. Orth, Ken Moore

Reports

Filtration by suspension-feeding bivalves affects water quality and the postulated impacts include increased light penetration and enhanced benthic primary production. Such system-level predictions are extrapolated fiom still water experiments which neglect the effects of flow, seston composition, turbulent mixing and refiltration by oysters within groups. Flume experiments were used to investigate the effects of varying flow speed and seston composition on filtration capacity of oysters. Six groups of 90 oysters were used in treatments which varied concentrations of the algae Ekalassiosira weisj70grgrsie parately and in combination with inorganics; four sets of shell only controls were used to evaluate hydrodynamic effects. …

Evidence For A Relation Between A White Perch Young-Of-The-Year Index And Indices Of Later Life Stages, Thomas C. Mosca Iii, Herbert M. Austin, David M. Plotner

VIMS Books and Book Chapters

Juvenile indices are employed in fisheries management to predict the future abundance of harvestable adults. Frequently, regulations on the utilization of the resource, and a lack of fishery independent abundance data, make verification of the prediction accuracy impossible. In the case of white perch in Virginia, this is not so. Using the weighting system developed for a Chesapeake Bay-wide index of juvenile striped bass abundance based on summertime beach seine data collected in nursery ground waters, we developed a similar index for white perch in the Virginia portion of the Bay. Regressions against Virginia Institute of Marine Science otter trawl …

The Precarious State Of The Chesapeake Public Oyster Resource, William J. Hargis Jr., Dexter S. Haven

VIMS Books and Book Chapters

The 243,000 acres of Virginia's public oyster reefs (a.k.a. the Baylor Grounds) have been extremely productive of usable and saleable (market .md seed) oysters (Crassostrea virginica), oyster shells and oyster shell by-products. Archaeological remains and historical records show that they have yielded great numbers of whole oysters, oyster meats, oyster "seed" and shell since the 01esapeake was formed some 3,000 years BP. In the last century their natural productivity, as indicated by commercial harvest records (the only long-term data available), has declined markedly. In 1904, Vrrginia's total market (adult) oyster harvest was about 7.6 million bushels (mostly from public grounds). …

The Status Of Virginia's Public Oyster Fishery 1994, Reinaldo Alonzo-Morales, Roger Mann

Reports

This report summarizes data collected during 1994 in the Virginia portion of the Chesapeake Bay. The report is composed of two parts, part one, oyster recruitment (shell string) in Virginia and part two, dredge survey of selected oyster bars in Virginia.

Clam Culture: The Possibilities And The Pitfalls, Michael J. Oesterling

Reports

Clam culture in-Virginia has recently received a ·great deal of attention due to the declining production of wild fishery stocks, and to the apparent success of some commercial clam farms. A 1994 survey of Virginia aquaculture by the Virginia Agricultural Statistics Service identified hard clams as the most valuable cultured product in the Commonwealth; production in 1993 exceeded $11 million in gross sales.

Be wary of reports that clam farming is easy and guarantees financial rewards. Farming clams is much more complicated than throwing clams overboard and returning a few years later to harvest them for market. The financial risks …

Genetic Relationships Among Geographically Isolated Populations Of Bluefish (Pomatamus Saltatrix), Catherine N. O'Neill

Dissertations, Theses, and Masters Projects

No abstract provided.

Spawning And Ecology Of Early Life Stages Of Black Drum, Pogonias Cormis, In Lower Chesapeake Bay, Louis Broaddus Daniel Iii

Dissertations, Theses, and Masters Projects

During spring 1990 and 1991, ichthyoplankton surveys were conducted in lower Chesapeake Bay to estimate seasonal egg production, population biomass and the impact of predation by gelatinous zooplankton on early life stages of black drum, Pogonias cromis. Rearing experiments indicated that at least three species of sciaenid (silver perch, Bairdiella chrysoura; weakfish, Cynoscion regalis and P. cromis) were spawning in the survey area during both years. Specific identification of eggs based on previously published ranges of outside egg diameter (OED) were not reliable due to considerable overlap in diameter distributions. Analysis of weekly OED frequency revealed the presence of three …

A Study Of The Histozoic Oyster Parasite, Perkinsus Marinus: I. Disease Processes In American Oysters (Crassostrea Virginica). Ii. Biochemistry Of Perkinsus Marinus, Aswani K. Volety

Dissertations, Theses, and Masters Projects

Numerous studies have investigated the disease processes of Perkinsus marinus in the oyster, Crassostrea virginica. However, the transmission dynamics and factors affecting P. marinus infection are still unclear. The objectives of this study were to investigate: (1) the principal and most effective lifestage of P. marinus, (2) the synergistic effects of temperature, salinity and P. marinus dose on disease prevalence, (3) suppression of host reactive oxygen intermediates by P. marinus, (4) the localization of acid phosphatase in the parasite, (5) the effects of temperature and salinity on acid phosphatase secretion, and (6) the P. marinus lipid and fatty acid composition. …

Determination Of The Natal Origin And Genetic Stock Composition Of A Juvenile Feeding Population Of The Loggerhead Turtle (Caretta Caretta) In Chesapeake Bay, Jeffrey Worner Norrgard

Dissertations, Theses, and Masters Projects

No abstract provided.

Tidepool Value As Foraging Patches For Breeding And Migrating Birds In Tidal Salt Marshes In The Lower Chesapeake Bay, Amanda Susan Allen

Dissertations, Theses, and Masters Projects

No abstract provided.

Nutrition And Feeding In Striped Bass Morone Saxatilis Larvae: Lipid And Fatty Acid Requirements And Microencapsulated Diets, Sureyya Ozkizilcik

Dissertations, Theses, and Masters Projects

There has been a growing interest in the commercial aquaculture of striped bass, Morone saxatilis. Little is known, however, about the nutritional requirements and feeding physiology of striped bass larvae. The objectives of this study were (a) to evaluate the efficiency of the live food enrichment techniques in studying the nutritional requirements for polyunsaturated fatty acids (PUFA), phospholipids and free amino acids, (b) to determine the ontogenetic changes of lipolytic enzymes, and (c) to develop a microencapsulated diet for striped bass larvae as full or partial replacement of live food. Three enrichment techniques, namely, microencapsulated fish oil, yeast/fish oil emulsion …

Regulating The Blue Crab, Callinectes Sapidus, Fishery In Virginia : Biological And Economic Concerns, James E. Kirkley, William D. Dupaul, Michael J. Oesterling

Reports

The blue crab, Callinectes sapiclus, fishery has been one of the most important fisheries of Virginia. The importance of the fishery in terms of commercial activities has substantially increased in recent years in response to declining resource levels of American Oyster, Crassostrea virginica, and a growing international and domestic demand for soft crabs, female hard crabs, and crab meat.

The actual economic importance of the fishery, however, is not well known. For example, what are the employment and earning levels generated by the fishery? What portion of a waterman's household income is derived from crabbing? How much does crabbing contribute …

Importation Of Shellfish From Outside The Coastal Waters Of Virginia, William D. Dupaul

Reports

No abstract provided.

Monitoring Juvenile Fishes In The Surf-Zone Of Virginia, And Development Of A Juvenile Bluefish Young-Of-The-Year Index In Virginia : 1994 Sampling Season, Donald M. Seaver, Herbert M. Austin

Reports

The Virginia Institute of Marine Science has conducted a monitoring program of the juvenile finfish in the Chesapeake Bay tributary rivers of Virginia since 1955, the striped bass spawning rivers since 1967 and the main stem Chesapeake Bay since 1988. These data are used to develop juvenile indices for several recreationally important species including spot, croaker, summer flounder, weakfish, black seabass and striped bass. The indices are important as both an index of recruitment success and effectiveness of management actions and are used in interstate Fishery Management Plans (FMP's) by the Atlantic States Marine Fisheries Commission (ASMFC) and the Chesapeake …

Estimation Of Juvenile Striped Bass Relative Abundance In The Virginia Portion Of Chesapeake Bay, January 1994-December 1994 : Annual Progress Report, Herbert M. Austin, A. Dean Estes, Donald M. Seaver

Reports

The Virginia Institute of Marine Science (VIMS) has conducted a juvenile striped bass seine survey from 1967 through 1973 and from 1980 through the present. The primary objective has been the monitoring of the relative annual recruitment success of juvenile striped bass in the spawning and nursery areas of Lower Chesapeake Bay. The survey was funded in it's initial period by the U.S. Fish and Wildlife Service and then reinstated in 1980 with funding from the National Marine Fisheries Service under the Emergency Striped Bass Study program. Commencing with the 1988 annual survey, support of the program has been made …

Characterization Of The Virginia Soft Crab / Peeler Industry, Michael J. Oesterling, Niels Moore

Reports

No abstract provided.

The Crab Industry In Venezuela, Ecuador, And Mexico Implications For The Chesapeake Bay Blue Crab Industry, Michael J. Oesterling, Charles Petrocci

Reports

No abstract provided.

Bycatch In The Virginia Menhaden Fishery: A Reexamination Of The Data, James Kirkley

Reports

No abstract provided.

Standardizing Fishing Effort & Individual Transerable Effort Programs In The Sea Scallop, Placopecten Magellanicus Fishery, James Kirkley, William D. Dupaul

Reports

No abstract provided.