Parasites and pathological conditions in the edible oyster, Crassostrea madrasensis (Preston), from the east and west coasts of India

A detailed pathological survey was carried out on the commercially important edible oyster, Crassostrea madrasensis (Preston), from two distinct coastal/brackish water ecosystems of south India. Samples were collected twice a year during wet and dry seasons from 2009 to 2012. Bacterial colonies in t...

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Bibliographic Details
Published in:Parasitology research (1987) 2017-09, Vol.116 (9), p.2569-2579
Main Authors: Suja, G., Kripa, V., Sunil Mohamed, K., Lijo, J., Mini, K. G., Sanil, N. K.
Format: Article
Language:English
Subjects:
Atrophy
Biomedical and Life Sciences
Biomedicine
Ciliates
Environmental aspects
Health aspects
Immunology
Medical Microbiology
Microbiology
Original Paper
Oysters
Parasites
Pollution levels
Protozoa
Seasonal variations
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Summary:A detailed pathological survey was carried out on the commercially important edible oyster, Crassostrea madrasensis (Preston), from two distinct coastal/brackish water ecosystems of south India. Samples were collected twice a year during wet and dry seasons from 2009 to 2012. Bacterial colonies in the form of prokaryotic inclusions, protozoans ( Perkinsus beihaiensis , Nematopsis sp. and ciliates Sphenophrya sp. and Stegotricha sp.), metazoans (trematodes, turbellaria, cestodes and crustaceans) and shell parasites ( Polydora spp. and Cliona spp.) along with various pathological conditions (digestive tubule atrophy, ceroid bodies, haemocytic infiltration, tissue necrosis and neoplastic disorders) were observed in C. madrasensis collected from two sites. Intensity, spatial and seasonal variations in infection prevalence and pathological effects on the host were studied. The protozoan parasite, P. beihaiensis ; shell parasite, Polydora spp. and pathological condition, digestive gland atrophy were most prevalent in occurrence. High-intensity infections with P. beihaiensis , larval trematodes and Polydora spp. were found to cause significant impact on host physiology. All other parasites were observed with low mean prevalence and intensity. Karapad in Tuticorin bay, the site reported with marked pollution levels, exhibited higher number of parasitic taxa and high mean prevalence and intensity for pathological conditions.
ISSN:0932-0113
1432-1955
DOI:10.1007/s00436-017-5566-z