scholarly journals Changes in biochemical and hemocyte parameters of the Pacific oysters Crassostrea gigas fed T-Iso supplemented with lipid emulsions rich in eicosapentaenoic acid

2007 ◽  
Vol 343 (2) ◽  
pp. 261-275 ◽  
Author(s):  
Maryse Delaporte ◽  
Fu-Lin Chu ◽  
Chris Langdon ◽  
Jeanne Moal ◽  
Christophe Lambert ◽  
...  
Keyword(s):  
Eicosapentaenoic Acid ◽  
Crassostrea Gigas ◽  
Lipid Emulsions ◽  
Pacific Oysters ◽  
The Pacific

scholarly journals Distribution, Condition and Gonad Maturity of the Invasive Pacific Oysters (Crassostrea Gigas, Thunberg 1793) in Cimanuk Delta, Indramayu, West Java, Indonesia

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Selia Hermawati ◽  
Sulistiono Sulistiono ◽  
Agustinus M Samosir
Keyword(s):  
Distribution Pattern ◽  
Crassostrea Gigas ◽  
Brackish Water ◽  
Pacific Oyster ◽  
Condition Factor ◽  
Maturity Stage ◽  
West Java ◽  
Gonad Maturity ◽  
Pacific Oysters ◽  
The Pacific

Pacific oyster (Crassostrea gigas) is an invasive species which is able to adapt a wide range of environmental conditions. The study was conducted from August to October 2014. Objective of this study was to asses the distribution pattern, condition and gonad maturity length (Lm 50%) of the Pacific oysters in mangrove ecosystem of Cimanuk Delta, Indramayu, West Java, Indonesia.  This study was conducted in two adjacent areas:  Pabean Ilir and Pagirikan subdeltas. The oysters were collected from the estuary, brackish water ponds and the coastal flat, and  observed for their abundance, total length (mm) and weight (g). Morphological and histological methods were used to estimate the gonad maturity stage. Analysis were carried out to estimate distribution pattern and condition factor. According to the study, the Pacific oyster distribution pattern was clumped. The condition factor of the oyster was higher in the brackish water pond and estuary than in the coastal flat.  The Pacific oyster was found in gonad maturity stage (GMS) I – IV. The oyster was hermaprodit protandry and had length maturity (Lm 50%) of 47,46-48,43 mm (male) and 75,27-75,50  mm (female). 

Spatial Distribution of Pacific Oyster (Crassostrea gigas) Population Related Environment Factor in Coastal Water of Pabean Ilir, Indramayu

2020 ◽  
Vol 4 (1) ◽  
pp. 38-47
Author(s):  
Risma Qurani ◽  
Fredinan Yulianda ◽  
Agustinus Mangaratua Samosir
Keyword(s):  
Spatial Distribution ◽  
Coastal Water ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Oyster Population ◽  
Pacific Oysters ◽  
The Pacific ◽  
Arc Gis ◽  
Environment Factor ◽  
Spatial Condition

Pacific oysters (Crassostrea gigas, Thunberg, 1793) is a benthic organisme that tend to live and settle in the bottom. One of the pacific oyster habitat is Coastal Water of Pabean Ilir, Indramayu. The purpose of this study was to map spatial condition of the population related habitat of the oyster (Crassostrea gigas). The mapping were done with laptop, using Arc GIS. There were 15 points of sampling. The oyster population in Pabean Ilir can be categorized into three categories: low, medium, and high density. Based on the similarity of environmental characteristics the habitat were divided into four groups. Condition Coastal Water of Pabean Ilir such as temperature, salinity, pH, BOD, TSS, TDS, COD, and composition of substrate indicated Coastal Water of Pabean Ilir have compatibility optimum sufficient habitat to support the growth of pacific oyster

Limitations of the A-IM Method for Fecal Coliform Enumeration in the Pacific Oyster (Crassostrea gigas)

1987 ◽  
Vol 70 (3) ◽  
pp. 535-537
Author(s):  
Charles A Kaysner ◽  
Stephen D Weagant
Keyword(s):  
Escherichia Coli ◽  
Positive Reaction ◽  
Crassostrea Gigas ◽  
Water Samples ◽  
Fecal Coliform ◽  
Pacific Oyster ◽  
Food Products ◽  
Fecal Coliforms ◽  
Pacific Oysters ◽  
The Pacific

Abstract Use of the A-IM method, which was originally devised for testing water samples, has recently been extended for enumeration of fecal coliforms and Escherichia coli in shellfish and other food products. Results of our study indicate that while this method is reliable for analysis of growing waters, the use of the A-IM method for testing Pacific oysters may be less reliable because bacteria not belonging to the coliform group but which are sometimes present in these animals also give a positive reaction.

scholarly journals Bacteriophage as models for virus removal from Pacific oysters (Crassostrea gigas) during re-laying

1993 ◽  
Vol 111 (2) ◽  
pp. 325-335 ◽  
Author(s):  
T. J. Humphrey ◽  
K. Martin
Keyword(s):  
Crassostrea Gigas ◽  
Sea Water ◽  
Oyster Tissue ◽  
Virus Removal ◽  
Viral Contamination ◽  
Pacific Oysters ◽  
Naturally Occurring ◽  
The Pacific ◽  
Male Specific ◽  
The Impact

SummaryA study was undertaken to examine the feasibility of using naturally-occurring bacteriophages to assess the impact of re-laying on levels of viral contamination inCrassostrea gigas, the Pacific oyster. Two phages were chosen. One, male-specific (F+), was enumerated usingSalmonella typhimurium. The other, a somatic phage, was detected using an, as yet, uncharacterizedEscherichia coli. Investigations, using a variety of re-laying sites, demonstrated that numbers of F+ phage in oyster tissue declined more rapidly than those of somatic phage. For example, in oysters placed in commercially-used sea water ponds, F+ phage reached undetectable levels within 2–3 weeks, whereas somatic phage could still be detected 5 weeks after re-laying. The studies suggest that F+ phage may not be a suitable indicator for virus removal and that somatic phage may be better suited to this role.

scholarly journals Temporally balanced selection during development of larval Pacific oysters ( Crassostrea gigas ) inherently preserves genetic diversity within offspring

2021 ◽  
Vol 288 (1958) ◽  
pp. 20203223
Author(s):  
Evan Durland ◽  
Pierre De Wit ◽  
Chris Langdon
Keyword(s):  
Genetic Diversity ◽  
Crassostrea Gigas ◽  
Life Histories ◽  
Developmental Stages ◽  
Balancing Selection ◽  
Genetic Load ◽  
Selection Pressures ◽  
Pacific Oysters ◽  
The Pacific ◽  
Large Populations

Balancing selection is one of the mechanisms which has been proposed to explain the maintenance of genetic diversity in species across generations. For species with large populations and complex life histories, however, heterogeneous selection pressures may create a scenario in which the net effects of selection are balanced across developmental stages. With replicated cultures and a pooled sequencing approach, we show that genotype-dependent mortality in larvae of the Pacific oyster ( Crassostrea gigas ) is largely temporally dynamic and inconsistently in favour of a single genotype or allelic variant at each locus. Overall, the patterns of genetic change we observe to be taking place are more complex than what would be expected under classical examples of additive or dominant genetic interactions. They are also not easily explained by our current understanding of the effects of genetic load. Collectively, temporally heterogeneous selection pressures across different larval developmental stages may act to maintain genetic diversity, while also inherently sheltering genetic load within oyster populations.

Refrigerated Seawater Depuration for Reducing Vibrio parahaemolyticus Contamination in Pacific Oyster (Crassostrea gigas)

2010 ◽  
Vol 73 (6) ◽  
pp. 1111-1115 ◽  
Author(s):  
YI-CHENG SU ◽  
QIANRU YANG ◽  
CLAUDIA HÄSE
Keyword(s):  
Crassostrea Gigas ◽  
Vibrio Parahaemolyticus ◽  
Pacific Oyster ◽  
Most Probable Number ◽  
Probable Number ◽  
Log Reduction ◽  
Pacific Oysters ◽  
The Pacific ◽  
Postharvest Treatment ◽  
Depuration Process

The efficacy of refrigerated-seawater depuration for reducing Vibrio parahaemolyticus levels in Pacific oyster (Crassostrea gigas) was investigated. Raw Pacific oysters were inoculated with a mixed culture of five clinical strains of V. parahaemolyticus (105 to 106 most probable number [MPN] per g) and depurated with refrigerated seawater (5°C) in a laboratory-scale recirculation system equipped with a 15-W gamma UV sterilizer. Depuration with refrigerated seawater for 96 h reduced V. parahaemolyticus populations by >3.0 log MPN/g in oysters harvested in the winter. However, 144 h of depuration at 5°C was required to achieve a 3-log reduction in oysters harvested in the summer. Depuration with refrigerated seawater at 5°C for up to 144 h caused no significant fatality in the Pacific oyster and could be applied as a postharvest treatment to reduce V. parahaemolyticus contamination in Pacific oysters. Further studies are needed to validate the efficacy of the depuration process for reducing naturally accumulated V. parahaemolyticus in oysters.

scholarly journals The Negative Relationship between Fouling Organisms and the Content of Eicosapentaenoic Acid and Docosahexaenoic Acid in Cultivated Pacific Oysters, Crassostrea gigas

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 369
Author(s):  
Megumu Fujibayashi ◽  
Osamu Nishimura ◽  
Takashi Sakamaki
Keyword(s):  
Docosahexaenoic Acid ◽  
Eicosapentaenoic Acid ◽  
Crassostrea Gigas ◽  
Essential Fatty Acids ◽  
Negative Relationship ◽  
Condition Index ◽  
Pacific Oysters ◽  
Epa And Dha ◽  
In The Wild ◽  
Fouling Organisms

Bivalves serve as an important aquaculture product, as they are the source of essential fatty acids, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), in our diet. However, their cultivation in the wild can be affected by fouling organisms that, in turn, affect their EPA and DHA content. The effects of fouling organisms on the EPA and DHA contents of cultivated bivalves have not been well documented. We examined the effects of fouling organisms on the EPA and DHA contents and condition index of cultured oysters, Crassostrea gigas, in an aquaculture system. We sampled two-year-old oysters from five sites in Shizugawa Bay, Japan, in August 2014. Most of the fouling organisms were sponges, macroalgae, and Mytilus galloprovincialis. A significant negative relationship existed between the DHA content in C. gigas and the presence of sponges and macroalgae. A lower C. gigas EPA content corresponded to a higher M. galloprovincialis fouling mass and a lower C. gigas condition index. This can be explained by dietary competition between C. gigas and M. galloprovincialis for diatoms, which were the main producer of EPA in our study sites. Our findings indicate that fouling organisms likely reduce the EPA and DHA content in cultivated oysters. Therefore, our results suggest that the current efforts to remove fouling organisms from oyster clusters is an effective strategy to enhance the content of EPA and DHA in oysters.

scholarly journals Ostreid Herpesvirus 1 Infection among Pacific Oyster (Crassostrea gigas) Spat: Relevance of Water Temperature to Virus Replication and Circulation Prior to the Onset of Mortality

2014 ◽  
Vol 80 (17) ◽  
pp. 5419-5426 ◽  
Author(s):  
Tristan Renault ◽  
Anne Lise Bouquet ◽  
Julien-Thomas Maurice ◽  
Coralie Lupo ◽  
Philippe Blachier
Keyword(s):  
Water Temperature ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Mortality Rates ◽  
Mass Mortality ◽  
Content Type ◽  
Pacific Oysters ◽  
The Pacific ◽  
Herpesvirus 1 ◽  
Ostreid Herpesvirus 1

ABSTRACTA number of bivalve species worldwide, including the Pacific oyster,Crassostrea gigas, have been affected by mass mortality events associated with herpesviruses, resulting in significant losses. A particular herpesvirus was purified from naturally infected larval Pacific oysters, and its genome was completely sequenced. This virus has been classified asOstreid herpesvirus 1(OsHV-1) within the familyMalacoherpesviridae. Since 2008, mass mortality outbreaks amongC. gigasin Europe have been related to the detection of a variant of OsHV-1 called μVar. Additional data are necessary to better describe mortality events in relation to environmental-parameter fluctuations and OsHV-1 detection. For this purpose, a single batch of Pacific oyster spat was deployed in 4 different locations in the Marennes-Oleron area (France): an oyster pond (“claire”), a shellfish nursery, and two locations in the field. Mortality rates were recorded based on regular observation, and samples were collected to search for and quantify OsHV-1 DNA by real-time PCR. Although similar massive mortality rates were reported at the 4 sites, mortality was detected earlier in the pond and in the nursery than at both field sites. This difference may be related to earlier increases in water temperature. Mass mortality was observed among oysters a few days after increases in the number of PCR-positive oysters and viral-DNA amounts were recorded. An initial increment in the number of PCR-positive oysters was reported at both field sites during the survey in the absence of significant mortality. During this period, the water temperature was below 16°C.

The use of lipid emulsions for sterol supplementation of spat of the Pacific oyster, Crassostrea gigas

Aquaculture ◽  
2000 ◽  
Vol 184 (3-4) ◽  
pp. 315-326 ◽  
Author(s):  
Philippe Soudant ◽  
Maica Val Sanles ◽  
Claudie Quere ◽  
Jean Rene Le Coz ◽  
Yanic Marty ◽  
...  
Keyword(s):  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Lipid Emulsions ◽  
The Pacific
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