Relationships between oyster mortality patterns and environmental data from monitoring databases along the coasts of France

Soletchnik, Patrick; Ropert, Michel; Mazurié, Joseph; Fleury, Pierre Gildas; Coz, Florence Le

doi:10.1016/j.aquaculture.2007.02.049

Cited by 107 publications

(66 citation statements)

References 20 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Indeed, as mortality events result from a combination of factors, in a different manner from one ecosystem to another, there is a need for site-specific investigations of environmental parameters to provide a better understanding of the summer mortality phenomenon (Soletchnik et al 2007). To this end, seawater temperature, salinity, rainfall, phytoplankton concentration and quality, and dissolved oxygen concentrations were analysed parallel to mortality monitoring.…”

Section: Abstract: Bivalves · Energetic Reserve · Environment · Fattmentioning

confidence: 99%

“…Mass mortalities of Crassostrea gigas have been reported in many areas of the world where this species is cultivated: in Japan (Mori 1979), the USA (Perdue et al 1981, Cheney et al 2000, Friedman et al 2005, Mexico (Luna-González et al 2009), and Western Europe (France: Soletchnik et al 2007, Germany: Watermann et al 2008 andIreland: Malham et al 2009). During spring-summer 2008, mass mortality of 1-yr-old C. gigas occurred simultaneously along all coasts of France.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event

Pernet¹,

Barret²,

Marty³

et al. 2010

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Mortality of oysters Crassostrea gigas occurred along the coasts of France during summer 2008, causing a serious crisis in French oyster production. During spring to summer 2008, 5 groups of 1-yr old oysters of different origins and ploidy levels deployed in the Thau lagoon (France) were sampled for biometrical and biochemical analyses; environmental parameters were monitored in the same area. Mortality occurred in 2 episodes: 13 May to 10 June and 24 June to 9 July. Wild-collected oysters showed mortality sooner than other groups but total overall mortality was 85% in all groups. Mortality occurred when seawater temperature was >19°C during the reproductive season when energetic reserves of oysters were at their lowest. Energy reserve levels and mortality in oysters seemed to be independent of reproductive effort, and most likely reflected an unusual deficit in phytoplankton. The level of bacterial fatty acids in oysters increased markedly before the second mortality event, probably indicating an enhancement of the microbial loop or decomposition processes. At the same time, unsaturation of oyster fatty acids decreased, suggesting a diet change, acclimatization to increasing temperature or, most likely, oxidative damage due to an enhanced production of reactive oxygen species, which are often associated with stressful situations. Wild-collected and hatchery-produced oysters, which exhibited different mortality patterns, showed persistent differences in fatty acid (20:5n-3 and 22:6n-3) content in their membrane, despite the fact that they were reared in the same environment. Mortality started when fatty acid 20:4n-6 content increased to ~3% in the polar lipids, suggesting that this ratio could make a useful indicator of mortality risk. Finally, the 2008 mortality event coincided with a nationwide increase of ~1.5°C in winter seawater temperature, which may impact the oyster and its pathogens. KEY WORDS: Bivalves · Energetic reserve · Environment · Fatty acid · Summer mortality · Trophic signatures · TemperatureResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 401: 129-146, 2010 their relative importance, a model was recently proposed to explain the summer mortality of the Pacific oyster Crassostrea gigas in France, incorporating the animal, its pathogens and the environment (Samain & McCombie 2008).According to this model, mortalities occur when seawater temperature exceeds 19 to 20°C during the spring-summer period. Once temperatures exceed this threshold, oysters usually reach the pre-spawning stage characterized by a negative energy budget: energetic resources attain their lowest level whereas energy demand and reproductive effort are at their highest (Soletchnik et al. 1997, Berthelin et al. 2000, Delaporte et al. 2006, Samain & McCombie 2008. Oyster haemocytes, circulating cells that play an important role in defence, also show their lowest performance at this time (Delaporte et al. 2006, Gagnaire et al. 2006, Li et al. 2009). Finally, although ve...

show abstract

Section: Abstract: Bivalves · Energetic Reserve · Environment · Fattmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event

Pernet¹,

Barret²,

Marty³

et al. 2010

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…One of the first descriptions of an MMB outbreak dates to 1878, with the observation of bivalve diseases (Lafferty et al 2004). Mass (or abnormal) mortalities of bivalve populations are generally defined as a loss of > 30% of the stock (Soletchnik et al 2007, EFSA 2010). An increasing number of MMB outbreaks throughout the world has been reported since the 1960s (Imaï et al 1965, Harvell et al 1999, Lafferty et al 2004, Soletchnik et al 2007).…”

Section: Review Of Literaturementioning

confidence: 99%

“…Mass (or abnormal) mortalities of bivalve populations are generally defined as a loss of > 30% of the stock (Soletchnik et al 2007, EFSA 2010). An increasing number of MMB outbreaks throughout the world has been reported since the 1960s (Imaï et al 1965, Harvell et al 1999, Lafferty et al 2004, Soletchnik et al 2007). This increase can be explained as a result of research progress on identification of diseases, the intensification of bivalve aquaculture, or may reflect changes in environmental conditions in production areas caused by climate change and water pollution.…”

Section: Review Of Literaturementioning

confidence: 99%

A comparative appraisal of the resilience of marine social-ecological systems to mass mortalities of bivalves

Guillotreau¹,

Allison²,

Bundy³

et al. 2017

E&S

View full text Add to dashboard Cite

ABSTRACT. In many parts of the world, both wild and cultured populations of bivalves have been struck by mass mortality episodes because of climatic and anthropogenic stressors whose causes and consequences are not always clearly understood. Such outbreaks have resulted in a range of responses from the social (fishers or farmers) and governing systems. We analyzed six commercial bivalve industries affected by mass mortalities using I-ADApT, a decision support framework to assess the impacts and consequences of these perturbations on the natural, social, and governing systems, and the consequent responses of stakeholders to these events. We propose a multidimensional resilience framework to assess resilience along the natural, social, and governing axes and to compare adaptive responses and their likelihood of success. The social capital and governability of the local communities were key factors affecting the communities' resilience and adaptation to environmental changes, but the rapid degradation of natural ecosystems puts the bivalve industry under a growing threat. Bivalve mariculture and fishing industries are likely to experience increased frequency, severity, and prevalence of such mass mortality events if the resilience of the natural systems is not improved. An understanding of previous adaptation processes can inform strategies for building adaptive capacity to future events.

show abstract

“…Although the Portuguese oyster, C. angulata, was highly susceptible to this virus, C. gigas appeared resistant to this virus disease. In late 70ies and early 80ies, high mortalities (more that 50%) of Pacific oyster larvae have been reported in commercial hatcheries from Washington State in USA [6].The cause of C. gigas summer mortalities remained unclear, but studies suggested a complex etiology in which environmental and physiological conditions of the host (age/weight and sexual maturation) were involved [7,8].…”

Section: Introductionmentioning

confidence: 99%

Ostreid herpesvirus: A pathogen of oysters

Mandas¹,

Salati²

2017

Virol Res Rev

View full text Add to dashboard Cite

Ostreid Herpesvirus-1 (OsHV-1), OsHV-1 μvar and other variants are herpesviruses causing heavy mortalities, with losses ranging from 50 to 100%, on Pacific oyster (Crassostrea gigas), an important species worldwide cultured. Ostreid Herpesvirus-1 is one of the top 50 largest viral genome; OsHV-1 μvar is a variant of the virus OsHV-1 showing a systematic deletion of 12/13 base pairs sequence between ORF4 and ORF5. For the diagnosis of herpesvirus infection, traditional histopathological methods and biomolecular techniques have been developed, but, to confirm the disease, both methods should be used. This mini review reports some studies on the virus.

show abstract

Relationships between oyster mortality patterns and environmental data from monitoring databases along the coasts of France

Cited by 107 publications

References 20 publications

Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event

Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event

A comparative appraisal of the resilience of marine social-ecological systems to mass mortalities of bivalves

Ostreid herpesvirus: A pathogen of oysters

Contact Info

Product

Resources

About