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Depuration of Bacterial Populations in the Indian Backwater Oyster Crassostrea madrasensis (Preston, 1916): Effects on Surface and Bottom Held Oysters

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Relation http://eprints.cmfri.org.in/10235/
http://www.bioone.org/doi/full/10.2983/035.033.0209
 
Title Depuration of Bacterial Populations in the Indian Backwater Oyster Crassostrea
madrasensis (Preston, 1916): Effects on Surface and Bottom Held Oysters
 
Creator Chinnadurai, S
Mohamed, K S
Venkatesan, V
Jenni, B
Kripa, V
 
Subject Edible oyster
Molluscan Fisheries
 
Description The efficiency of depuration of the Indian backwater oyster Crassostrea madrasensis (Preston, 1916) using the filldraw
method (static method) with high-loading density was evaluated in this study. Depuration experiments were conducted with
cartridge-filtered and UV-treated seawater at a salinity of 30.3&, a pH of 8.3, and a temperature of 29.5C. The oysters located in
trays on the surface and on the bottomwere compared formicrobial loads. Samples were taken at 0 h, 8 h, 16 h, 24 h, 36 h, and 48 h of
depuration. The results showed that in wintermonsoon-sampled nondepurated oysters, themost probable number of fecal coliforms
and Escherichia coli were greater than the limits according to NSSP and European Union regulations. The surface held oysters took
24 h to reduce the coliforms and E. coli levels to belowsafe limitswhereas for bottomheld oysters it took 48 h. The species Salmonella
was never detected in the oysters sampled, whereas Vibrio spp. were present in the nondepurated oysters and were eliminated
completely after 8 h of depuration. Variation in depuration of total coliforms, fecal coliforms, E. coli, total plate count, and fecal
streptococci in oysterswere significant (P < 0.05) between surface and bottomoysters. The study results recommend a loading density
of 2 oysters/L water stacked in 1 layer as the optimum loading density for commercial depuration completed within 24 h.
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10235/1/Journal_of_Shellfish_Res._Chinnadurai_2014.pdf
Chinnadurai, S and Mohamed, K S and Venkatesan, V and Jenni, B and Kripa, V (2014) Depuration of Bacterial Populations in the Indian Backwater Oyster Crassostrea madrasensis (Preston, 1916): Effects on Surface and Bottom Held Oysters. Journal of Shellfish Research, 33 (2). pp. 409-414.