Determining culture strategies in populations of the European flat oyster, Ostrea edulis, affected by bonamiosis

Montes, Jaime; Ferro-Soto, Beatriz; Conchas, Ramón F.; Guerra, Alejandro

doi:10.1016/s0044-8486(02)00628-2

Cited by 26 publications

(16 citation statements)

References 2 publications

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“…This compares favorably with the previously reported period of 3 to 6 months for transmission (Poder et al 1982;Tigé and Grizel 1984;Grizel 1985;Elston et al 1986;Montes 1991;Hervio et al 1995;Culloty and Mulcahy 1996;Culloty et al 2004) (Annex 1). However, some studies of field testing reported a longer time for the transmission of the disease, from 6 to 12 months (Culloty et al 1999;Montes et al 2003) (Annex 1). In contrast, experimental infection by direct injection of purified parasite could lead to the first detection of the parasite after only 2 months (Mialhe et al 1988;Hervio et al 1995) (Annex 4).…”

Section: Factors Controlling Transmission Of the Diseasementioning

confidence: 99%

“…Most of them were based on field testing, deploying naïve oysters (i.e. never exposed to the parasite) in a contaminated area, recording the time to the first infections and their evolution over time (Poder et al 1982;Tigé and Grizel 1984;Montes 1991;Martin et al 1993;Cáceres-Martínez et al 1995;Culloty and Mulcahy 1996;Naciri-Graven et al 1998;Culloty et al 1999;Montes et al 2003;Culloty et al 2004;Lynch et al 2005). Other studies were based on experimental cohabitation between oysters sampled in contaminated areas and naïve oysters, in order to analyze the evolution of the disease (Elston et al 1986(Elston et al , 1987Martin et al 1993;Culloty et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Bonamia ostreae-induced mortalities in one-year old European flat oystersOstrea edulis: experimental infection by cohabitation challenge

Lallias

Arzul

Heurtebise

et al. 2008

Aquat. Living Resour.

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-Bonamiosis is a parasitic disease (causative agent: Bonamia ostreae) affecting the European flat oyster Ostrea edulis, responsible for a drastic decline in its aquaculture production. Selective breeding programs for resistance to bonamiosis have been undertaken to counter this disease. In the present study, a 6-month cohabitation challenge experiment was performed in order to transmit the disease from wild oysters injected with the parasite to two tested families of oysters (20 and 8-month old at the beginning of the experiment, with different genetic backgrounds) originating from a selective breeding program developed by IFREMER in France. Mortalities were checked daily and ventricular heart smears were performed on dying or moribund oysters to detect the level of infection by B. ostreae. Mortality started after 4 months of cohabitation in the tested oysters. The cumulative mortalities after 6 months were 58% for the wild oysters, 9% for Family 1 (20-month old) and 20% for Family 2 (8-month old). In the dying oysters, the parasite could be detected in 67% of the wild oysters, 68% of Family 1 and 89% of Family 2. It was detected in only 11% of the surviving oysters of Family 2. The mortality and the level of infection by the parasite were significantly higher in Family 2 than in Family 1. Our results demonstrate that prespawning oysters as young as 1 year-old can become infected with the parasite and, most importantly, can die from bonamiosis. This result is inconsistent with the commonly accepted critical age of 2 years-old for the disease development. Additionally, no clear relationship between shell length and level of infection was observed. We also review the different methods for infection of the European flat oyster O. edulis with B. ostreae under experimental conditions and their main results. Key words:Ostrea edulis / Bonamia ostreae / Cohabitation experiment / Transmission / Heart smear Résumé -Mortalités induites par Bonamia ostreae chez des huîtres plates européennes Ostrea edulis âgées d'un an : infection expérimentale par cohabitation. La bonamiose est une maladie parasitaire (agent causal : Bonamia ostreae) affectant l'huître plate européenne Ostrea edulis, responsable d'un déclin drastique de sa production aquacole. Des programmes de sélection pour la résistance à la bonamiose ont été entrepris pour contrer cette maladie. Dans cette étude, une expérience de 6 mois d'infection par cohabitation a été réalisée de manière à transmettre la maladie à partir d'huîtres sauvages injectées avec le parasite vers deux familles testées d'huîtres (âgées de 20 et 8 mois en début d'expérience, avec des origines génétiques différentes) issues du programme de sélection développé par IFREMER en France. Les mortalités ont été vérifiées quotidiennement et des frottis de coeur ventriculaire réalisés sur les huîtres mortes ou moribondes pour détecter le niveau d'infection par B. ostreae. La mortalité a commencé chez les huîtres testées après 4 mois de cohabitation. Les mortalités cumulées après 6 mois étaient...

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Section: Factors Controlling Transmission Of the Diseasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bonamia ostreae-induced mortalities in one-year old European flat oystersOstrea edulis: experimental infection by cohabitation challenge

Lallias

Arzul

Heurtebise

et al. 2008

Aquat. Living Resour.

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“…In Europe, particularly France and Spain, O. edulis remains an emblematic species and attempts to develop "resistant strains" have been made in both countries (Lallias et al, 2010;Montes et al, 2003;Naciri-Graven et al, 1988). Moreover, such interest in flat oyster cultivation is now increasing in France due to high C. gigas juvenile mortalities (Pernet et al, 2010;Samain and Mc Combie, 2008).…”

Section: Introductionmentioning

confidence: 99%

The selection of an ideal diet for Ostrea edulis (L.) broodstock conditioning (part B)

et al. 2012

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International audienceFour microalgae species (Rhodomonas salina, Thalassiosira weissflogii, Thalassiosira pseudonana and Pavlova lutheri) were evaluated to estimate their potential as food for Ostrea edulis (L.) reproductive conditioning. Best ingestion and absorption were observed with R. salina (3.44 and 1.59 mg g− 1 h− 1, respectively), followed by T. pseudonana (2.75 and 0.98 mg g− 1 h− 1) and P. lutheri (2.40 and 0.91 mg g− 1 h− 1). Oysters fed T. weissflogii exhibited the lowest ingestion and absorption values (1.40 and 0.68 mg g− 1 h− 1). Proximate composition (proteins and carbohydrates) and lipid content (fatty acids and sterols) analysed in four main tissues (gonad, digestive gland, muscle and gills) also differed significantly with diet. Protein ranged from 355 mg g− 1 in the gonad of oysters fed P. lutheri to 837 mg g− 1 in gills of oysters fed T. weissflogii; whereas carbohydrates ranged from 17.5 mg g− 1 in gills of oysters fed P. lutheri to 271 mg g− 1 in gonads of oysters fed R. salina. An overall poor enrichment in total PUFAs across all diets masked some of their potential impact on nutrition. In gonad, however, the major polyunsaturated fatty acids (polar lipid fraction) were EPA (≈ 19% for oysters fed T. weissflogii and 14% for those fed P. lutheri) and DHA (17% for oysters fed P. lutheri and 15% for those fed R. salina). Sterol contents showed a clear transfer from food to oyster tissues except with P. lutheri, from which neither methylpavlovol nor ethylpavlovol (characteristic of Pavlophyceae) were detected in oyster tissues. Histological analysis showed that gametogenesis was active in oysters fed R. salina and T. weissflogii, whereas only low gonadic development occurred in unfed oysters or those fed P. lutheri. R. salina is accordingly highly recommended for O. edulis broodstock conditioning whereas P. lutheri should be excluded

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“…By contrast, prevalences were very low (less than 1% a year), in Brittany in a study including 6 years of survey (Balouet et al, 1986). The association with the period of high prevalences of bonamiosis (spring-summer) in Galicia could be an additional source of stress for oysters (Montes et al, 2003;da Silva et al, 2005a).…”

Section: Discussionmentioning

confidence: 90%

Disseminated neoplasia in flat oysters Ostrea edulis from Galicia (NW Spain): Occurrence, ultrastructural aspects and relationship with bonamiosis

Silva

Fuentes

Villalba

2011

Journal of Invertebrate Pathology

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Determining culture strategies in populations of the European flat oyster, Ostrea edulis, affected by bonamiosis

Cited by 26 publications

References 2 publications

Bonamia ostreae-induced mortalities in one-year old European flat oystersOstrea edulis: experimental infection by cohabitation challenge

Bonamia ostreae-induced mortalities in one-year old European flat oystersOstrea edulis: experimental infection by cohabitation challenge

The selection of an ideal diet for Ostrea edulis (L.) broodstock conditioning (part B)

Disseminated neoplasia in flat oysters Ostrea edulis from Galicia (NW Spain): Occurrence, ultrastructural aspects and relationship with bonamiosis

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