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Reproductive dysfunction in the edible oyster, Crassostrea madrasensis due to larval bucephalid infection – a case study

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Relation http://eprints.cmfri.org.in/10054/
 
Title Reproductive dysfunction in the edible
oyster, Crassostrea madrasensis due to
larval bucephalid infection – a case study
 
Creator Suja, G
Sanil, N K
Chinnadurai, S
Vijayan, K K
 
Subject Edible oyster
 
Description The present case study provides an insight into the tissue level
pathological alterations inflicted by Bucephalus sp. infections in
the edible oyster, Crassostrea madrasensis. Oysters collected
during a routine study (from the oyster beds along the Southeast
coast of India during July 2012) was found to harbor larval
bucephalid infection. Though the prevalence of infection was
low (1.37%), the intensity of infection was high, rated as two on
the semi-quantitative scale. Infected oyster did not exhibit any
external manifestation, but the developing parasitic stages, after
replacing the host gonadal tissues have further spread to the
gills and digestive glands. Regions of gonadal tissues were
found packed with slender, branching sporocysts containing
germ balls and crecariae, destroying the acinar architecture of
the gonads. Immune responses like encapsulation against the
infective stages were totally absent. The altered acinar
architecture and reduced volume of the gonadal acini appeared
to be insufficient to support any gametic release, resulting in
gonadal dysfunction leading to parasitic castration of the host.
An increase in the prevalence of Bucephalus sp. infection in the
ecosystem could seriously hamper the reproductive potential of
the wild stocks of oysters, thereby affecting the viability of oyster
farming in the region.
 
Publisher Journal of the Marine Biological Association
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10054/1/Article-1.pdf
Suja, G and Sanil, N K and Chinnadurai, S and Vijayan, K K (2013) Reproductive dysfunction in the edible oyster, Crassostrea madrasensis due to larval bucephalid infection – a case study. Journal of the Marine Biological Association of India, 55 (2). pp. 5-10.