Oyster (Crassostrea virginica, Gmelin 1791) Population Dynamics on Public Reefs in the Great Wicomico River, Virginia, USA

Se realizó una caracterización poblacional del ostión americano Crassostrea virginica existente en tres lagunas costeras de Tabasco. Para esto se determinó la biometría, la estructura poblacional, los parámetros de crecimiento poblacional y el rendimiento durante un ciclo anual. Mensualmente se recolectaron al azar 200 organismos determinándose: frecuencia de tallas, pesos, tasas de crecimiento, expresadas L∞ y K y el rendimiento en carne. Las longitudes totales oscilaron entre 7 y 66 mm, entre 7 y 80 mm y entre 27 y 90 mm, para El Carmen, Machona y Mecoacán, respectivamente, en la mayoría de los meses los organismos fueron mayores a 65 mm, sin embargo, en la laguna El Carmen no alcanzaban la talla de captura permisible para la especie que es de 70 mm. Con relación al peso húmedo total, los organismos de mayor peso, se presentaron en la laguna Mecoacán. El rendimiento en carne mensual presentó su valor mínimo en Enero (51.98 ± 5.23 %) en la laguna de El Carmen y un valor máximo en Mayo (106.29 ± 19.32 %) para la laguna Mecoacán, detectándose diferencias significativas mensuales (Fs = 79.31; P 0.001).

Download Full-text

The Potential for Oysters,Crassostrea virginica, to Develop Resistance to Dermo Disease in the Field: Evaluation using a Gene-Based Population Dynamics Model

Journal of Shellfish Research ◽

10.2983/035.030.0310 ◽

2011 ◽

Vol 30 (3) ◽

pp. 685-712 ◽

Cited By ~ 22

Author(s):

Eric N. Powell ◽

John M. Klinck ◽

Ximing Guo ◽

Susan E. Ford ◽

David Bushek

Keyword(s):

Population Dynamics ◽

Crassostrea Virginica ◽

Field Evaluation ◽

Dynamics Model ◽

Population Dynamics Model ◽

Dermo Disease

Download Full-text

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100076263 ◽

1983 ◽

Vol 41 ◽

pp. 518-519

Author(s):

George G. Cocks ◽

Louis Leibovitz ◽

DoSuk D. Lee

Keyword(s):

Crystal Structure ◽

Crassostrea Virginica ◽

Crystal Orientation ◽

Developmental Changes ◽

Gastrula Stage ◽

Orthorhombic Crystal ◽

Orthorhombic Crystal Structure ◽

Stages Of Growth ◽

Early Stages ◽

Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

Download Full-text