Brown muscle disease and Manila clam Ruditapes Philippinarum dynamics in Arcachon Bay, France

Dang, Cecile and De Montaudouin, Xavier (2009) Brown muscle disease and Manila clam Ruditapes Philippinarum dynamics in Arcachon Bay, France. Journal of Shellfish Research, 28 2: 355-362. doi:10.2983/035.028.0218

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Author Dang, Cecile
De Montaudouin, Xavier
Title Brown muscle disease and Manila clam Ruditapes Philippinarum dynamics in Arcachon Bay, France
Journal name Journal of Shellfish Research   Check publisher's open access policy
ISSN 0730-8000
1943-6319
Publication date 2009-04
Year available 2009
Sub-type Article (original research)
DOI 10.2983/035.028.0218
Open Access Status File (Publisher version)
Volume 28
Issue 2
Start page 355
End page 362
Total pages 8
Place of publication Hanover, PA United States
Publisher National Shellfisheries Association
Language eng
Formatted abstract
Brown Muscle Disease (BMD) affects Manila clam Ruditapes philippmarum. It was described for the first time in 2005 in Arcachon Bay, France. The pathology consists in a progressive necrosis of the posterior adductor muscle, valve gaping, clam migration to the sediment surface, and death. This study aims to quantify the prevalence of BMD in the bay and to evaluate the effect of BMD on Manila clam dynamics. The prevalence was assessed on 50 stations spread within Arcachon Bay. About 62% of Manila clam habitat surface was infected by BMD. A survey of buried and surface clams was conducted from November 2006 to March 2008 in Lanton. a site infected by BMD. Modal progression analysis separated confidently cohorts from 2003 to 2005 recruitments. This pathology only affected adult clams (>25 mm, >2 years). For both buried and surface individuals, shell length was significantly correlated with BMD infection. Surface clams had prevalence (67%) higher than buried clams (23%) and showed greater mortality rate after 15 d in running water: 82% against 12% for buried individuals. The final disease index (FDI) and the condition index (CI) were monthly evaluated on 50 clams located at each position in the sediment. CI displayed a significant decrease after BMD's infection from light to severe disease stages. Length data analysis through Bhattacharya's method (FISAT II software) allowed identifying four cohorts. The 2003s cohort enabled to calculate mortality rate that was 39% for 5 months and to estimate that BMD was responsible of 95% of that mortality. The temperature was certainly an important factor in BMD transmission, because cohort dynamics results argued that BMD developed during spring and summer.
Keyword Manila clam
Brown muscle disease
Ruditapes philippinarum
Disease
Mortality
I
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Wed, 24 Jul 2013, 15:05:21 EST by Dr Cecile Dang on behalf of School of Biological Sciences