scholarly journals Lindane and Endosulfan Sulfate Isomers in Crassostrea virginica Oyster Populations (Gmelin, 1791) in Lagoon Systems from Central Gulf of Mexico

2017 ◽  
Vol 2 (4) ◽  
pp. 1579-1585
Author(s):  
Ruth Patricia Aragon-Lopez ◽  
Maria del Refugio Castaneda-Chavez ◽  
Alejandro Granados Barba ◽  
David Salas Monreal ◽  
Cesareo Landeros Sanchez
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Endosulfan Sulfate ◽  
Lagoon Systems

Phages Infecting Vibrio vulnificus Are Abundant and Diverse in Oysters (Crassostrea virginica) Collected from the Gulf of Mexico

1998 ◽  
Vol 64 (1) ◽  
pp. 346-351 ◽  
Author(s):  
Angelo DePaola ◽  
Miles L. Motes ◽  
Amy M. Chan ◽  
Curtis A. Suttle
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Vibrio Vulnificus ◽  
Gulf Coast ◽  
Morphological Evidence ◽  
Broad Host Range ◽  
Oyster Tissue ◽  
Mobile Bay ◽  
Apalachicola Bay ◽  
Transmission Electron

ABSTRACT Phages infecting Vibrio vulnificus were abundant (>104 phages g of oyster tissue−1) throughout the year in oysters (Crassostrea virginica) collected from estuaries adjacent to the Gulf of Mexico (Apalachicola Bay, Fla.; Mobile Bay, Ala.; and Black Bay, La.). Estimates of abundance ranged from 101 to 105 phages g of oyster tissue−1 and were dependent on the bacterial strain used to assay the sample. V. vulnificus was near or below detection limits (<0.3 cell g−1) from January through March and was most abundant (103 to 104 cells g−1) during the summer and fall, when phage abundances also tended to be greatest. The phages isolated were specific to strains of V. vulnificus, except for one isolate that caused lysis in a few strains of V. parahaemolyticus. Based on morphological evidence obtained by transmission electron microscopy, the isolates belonged to the Podoviridae,Styloviridae, and Myoviridae, three families of double-stranded DNA phages. One newly described morphotype belonging to the Podoviridae appears to be ubiquitous in Gulf Coast oysters. Isolates of this morphotype have an elongated capsid (mean, 258 nm; standard deviation, 4 nm; n = 35), with some isolates having a relatively broad host range among strains of V. vulnificus. Results from this study indicate that a morphologically diverse group of phages which infect V. vulnificus is abundant and widely distributed in oysters from estuaries bordering the northeastern Gulf of Mexico.

scholarly journals Potentially harmful cyanobacteria in oyster banks of Términos lagoon, southeastern Gulf of Mexico

2018 ◽  
Vol 23 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Carlos Antonio Poot-Delgado ◽  
Yuri B. Okolodkov ◽  
Jose Antolin Aké-Castillo ◽  
Jaime Rendón von Osten
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Terminos Lagoon ◽  
Harmful Cyanobacteria ◽  
Anabaena Sp ◽  
Laguna De Terminos

Las cianobacterias habitan en ambientes hipersalinos, marinos y de agua dulce. Algunas especies tóxicas y no tóxicas pueden formar florecimientos nocivos. El objetivo de este estudio fue identificar las especies de cianobacterias potencialmente nocivas en los bancos ostrícolas de laguna de Términos, sureste del Golfo de México. Seis sitios de muestreo (hasta 2 m de profundidad) fueron monitoreados mensualmente de agosto de 2012 a septiembre de 2013. Se midió la temperatura del agua, salinidad, pH, saturación de oxígeno, nutrientes inorgánicos y abundancia de cianobacterias. La temperatura y la salinidad se caracterizaron por marcadas diferencias estacionales (26,8 a 30,6 °C y 6,1 a 19,5, respectivamente). Los valores de pH (de 7,1 a 8,4) y la saturación de oxígeno disuelto (de 88,4 a 118,2 %) sugieren un predominio de la actividad fotosintética en la temporada de nortes (octubre-enero). Las concentraciones elevadas de los nutrientes están asociados al periodo de mayor descarga de los ríos, determinados por la circulación y los procesos biogeoquímicos. Se identificaron 14 taxa, de los cuales Anabaena sp., Merismopedia sp., Oscillatoria sp. y Cylindrospermopsis cuspis formaron florecimientos. Las abundancias de cianobacterias fueron del orden de magnitud de 106 células L-1 en octubre de 2012 en las estaciones S1-S6, con un valor promedio de 3.2x105 células L-1 y un rango de 2000 a 3.1x106 células L-1 a lo largo del periodo de estudio. Sin embargo, mostraron una ausencia notable durante la temporada de nortes (octubre a enero). Anabaena sp. y C. cuspis alcanzaron abundancias de 1.9x106 y 1.3x106 células L-1, respectivamente. Este último causó el cierre temporal de la colecta del ostión Crassostrea virginica durante 15 días en octubre de 2012.

scholarly journals Crassostrea virginica dredge efficiency in Texas estuaries

2020 ◽  
Vol 1 ◽  
Author(s):  
Jennifer Beseres Pollack ◽  
Terence A. Palmer
Keyword(s):  
Water Quality ◽  
Grain Size ◽  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Sediment Grain Size ◽  
Stock Assessments ◽  
Efficiency Rate

AbstractQuantifying and comparing stocks of oysters (Crassostrea virginica) within and among estuaries across the Gulf of Mexico is difficult because the sampling equipment used is either inconsistent among studies, or inefficient. In Texas, USA, stock assessments of oyster populations are made using an oyster dredge, which is an inefficient sampling tool. We compared sampling densities estimated by oyster dredges with more accurate estimates taken by diver-quadrat samples to determine a dredge efficiency rate. Our calculated efficiency rate (0.125) was negatively affected by the number of dead oysters, and the number and volume of total oysters in an area, but not affected by sediment grain size, water quality, and other oyster metrics. The dredge efficiency rate calculated in this study can be applied to past and future dredge-collected oyster quantity data to provide more realistic estimates of oyster densities and allow more accurate stock assessments and comparisons among studies and regions.

scholarly journals DDT in Crassostrea virginica (Gmelin, 1791) of Coastal Lagoons in the Gulf of Mexico

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
Ma del Refugio Castañeda-Chávez ◽  
Fabiola Lango-Reynoso ◽  
Cesáreo Landeros-Sánchez
Keyword(s):  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Coastal Lagoons

Distribution and bioaccumulation of heavy metals from produced water discharges to the gulf of Mexico

1995 ◽  
Vol 32 (2) ◽  
pp. 31-36 ◽  
Author(s):  
John H. Trefry ◽  
Kelly L. Naito ◽  
Robert P. Trocine ◽  
Simone Metz
Keyword(s):  
Heavy Metals ◽  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Produced Water ◽  
Sea Surface ◽  
Ambient Seawater ◽  
Tissue Levels ◽  
Discharge Pipe ◽  
Oil Platforms

Produced water, the largest volume waste generated during production of offshore gas and oil, is typically discharged into the ocean at the sea surface. Concentrations of some heavy metals, such as Cd, Pb, Fe and Ba, are enriched in produced water from the Gulf of Mexico relative to ambient seawater by factors of about 10 to &gt;10,000. In contrast, concentrations of other metals in produced water, including Hg, Ni and V, are generally close to or less than those in seawater. Concern for enhanced bioaccumulation of metals from water surrounding oil platforms was addressed by analyzing mollusks collected within 10 m of the discharge pipe. No statistically significant differences in tissue levels of Ba, Cd, Hg, Ni, Pb or V were identified for clams (Chama macerophylla) or oysters (Crassostrea virginica) collected from production platforms with variable loadings of heavy metals. Sediment in discharge areas from the Gulf of Mexico often had elevated levels of Pb and Ba relative to Al; however, such enhancement is unlikely to be solely related to produced water.

scholarly journals Endosulfan: Its Isomers and Metabolites in Commercially Aquatic Organisms from the Gulf of Mexico and the Caribbean

2015 ◽  
Vol 8 (1) ◽  
pp. 8 ◽  
Author(s):  
Gabycarmen Navarrete-Rodríguez ◽  
Cesáreo Landeros-Sánchez ◽  
Alejandra Soto-Estrada ◽  
María Del Refugio Castañeda-Chavez ◽  
Fabiola Lango-Reynoso ◽  
...  
Keyword(s):  
Public Health ◽  
Gulf Of Mexico ◽  
Crassostrea Virginica ◽  
Aquatic Organisms ◽  
Caribbean Sea ◽  
Aquatic Biota ◽  
Maximum Value ◽  
The World ◽  
The Caribbean ◽  
Route Of Exposure

<p>The organochlorine pesticide endosulfan is an insecticide and acaricide used on a variety of crops around the world. Its adverse effects on public health and aquatic biota have been widely documented in several studies, which are closely related to their primary route of exposure, by eating food contaminated with this compound. Therefore, it is necessary to concentrate the information in order to analyze and understand its impact on public health. The present objective is to review the characteristics of endosulfan, its isomers and their presence in aquatic organisms of commercial importance in the Gulf of Mexico and the Caribbean. The aquatic organisms involved were molluscs, crustaceans and fish. The highest concentrations of endosulfan have been detected in oysters, <em>Crassostrea virginica</em>, with a maximum value of 99.48±16.21 ng g<sup>-1</sup>. Although the use of this insecticide for pest control worldwide is prohibited, research conducted in the Gulf of México and Caribbean Sea indicate that it is still used, which will affect future public health and consumers.</p>

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