Mass mortalities of Pacific oysters Crassostrea gigas reflect infectious diseases and vary with farming practices in the Mediterranean Thau lagoon, France

By F. Pernet, J. Barret, P. L. Gall, C. Corporeau, L. Dégremont, F. Lagarde, J. Pépin, N. Keck. 2012

205 citations recorded by the source corpus.

Experiments were conducted to investi- gate the effects of farming sites, seeding date, age of oysters, ploidy level and rearing structures on mor - tality, pathogens and energetic reserves of oysters Crassostrea gigas. Mortality of oysters coincided with infections involving, primarily, the ostreid herpesvirus OsHV-1 and, secondarily, bacteria of the group Vibrio splendidus, when seawater temperature was between 17 and 24°C. Mortality started in early May and lasted until late September, with an interruption in July and August when seawater temperatures rose above 24°C. Mortality varied with farming site: oysters maintained in the open Mediterranean Sea showed no mortality and OsHV-1 was occasionally detected at a low level only, while oysters maintained in the farming area of the Thau lagoon exhibited mass mortality events concomitantly with outbreaks of OsHV-1. Mortality of oysters maintained in the Thau lagoon but outside the oyster farming area was sporadic and co incided with currents coming from the farming area where mortality was occurring. Mortality of oysters also varied with farming practices. Naive oysters remained susceptible to pathogen-related mortality pressure during their first 2 yr, whereas oysters that had survived a mass mortality event in the past appeared resistant. Mor - talities of diploid (2n) and triploid (3n) oysters were similar during spring but mortalities of 2n oysters were double those of 3n oysters during summer and autumn. Finally, oysters grown in Australian baskets suffered 80% mortality compared with only 30% among oysters cemented onto ropes. The effects of farming practices on mortality are discussed in relation to pathogens and energetic reserves of oysters. OPENEN ACCESSCESS

Subfields: Aquatic Science, Global and Planetary Change, Oceanography

View Paper: https://www.semanticscholar.org/paper/26f76f6f909e752a2c33e86439d1a961d90c509b

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In Aquatic Science

1. L. Dégremont
2. Elise Maurouard
3. Max Nourry
4. F. Pernet
5. Pierre Boudry
6. B. Petton
7. M. Alunno‐Bruscia

In Global and Planetary Change

1. L. Dégremont
2. Elise Maurouard
3. Max Nourry
4. F. Pernet
5. Pierre Boudry
6. B. Petton
7. M. Alunno‐Bruscia

In Oceanography

1. L. Dégremont
2. M. Alunno‐Bruscia

Citations in the corpus

• Mass selection for survival and resistance to OsHV-1 infection in Crassostrea gigas spat in field conditions: response to selection after four generations (2015, background): “This was strongly supported through a similar mortality data for C. gigas spat in France obtained before and after 2008.”
• Size and genotype affect resistance to mortality caused by OsHV-1 in Crassostrea gigas (2013, methodology): “2a), which confirms the new lower threshold defined in the Thau lagoon around 17°C (Pernet et al., 2012) and in cohabitation trials in the laboratory using an unheated seawater flowthrough system (Dégremont et al.”
• Factors influencing disease-induced mortality of Pacific oysters Crassostrea gigas (2015, background): “%) compared to that of animals maintained in Australian baskets (13%), where the circulation of water around each individual and flushing rate was lower and the density of susceptible hosts was higher (Pernet et al. 2012).”
• Descriptive epidemiology of mass mortality due to Ostreid herpesvirus-1 (OsHV-1) in commercially farmed Pacific oysters (Crassostrea gigas) in the Hawkesbury River estuary, Australia (2014, background): “, 2013) and in the field (Pernet et al., 2012).”