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A comparison of parasites, pathological conditions and condition index of wild and farmed populations of Magallana bilineata (Roding, 1798) from Vembanad Lake, west coast of India

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Title A comparison of parasites, pathological conditions and condition index of
wild and farmed populations of Magallana bilineata (Roding, 1798) from
Vembanad Lake, west coast of India
Not Available
 
Creator Suja,G
Lijo,J
Kripa,V
Mohamed,K S
Vijayan,K K
Sanil,N K
 
Subject Crassostrea madrasensis
Magallana bilineata
Perkinsus beihaiensis
histopathology
Parasites
Pathological conditions
Condition index
 
Description Not Available
This study forms the first attempt to assess the health status, studying parasites and pathologies in wild or natural
and farmed or cultured populations of the Indian backwater oyster, Magallana bilineata (= Crassostrea madrasensis
Preston, 1916), the mainstay of oyster farming in the country. The Condition index, prevalence of
infection, intensity, and seasonal variations in parasites and pathological conditions were studied. Wild oyster
population was infected/infested with protozoan (Perkinsus beihaiensis, Nematopsis sp., Sphenophrya sp., and
Stegotricha sp.), metazoan (cestodes and crustaceans), and shell (Polydora spp. and Cliona spp.) parasites and
pathological conditions (digestive tubule atrophy, ceroid bodies, haemocytic infiltration, tissue necrosis, neoplastic
disorders, and prokaryotic inclusions). Farmed population exhibited only a single protozoan (P. beihaiensis),
a metazoan (Polydora sp.) infection and two pathological conditions (digestive tubule atrophy and
ceroid bodies) in the tissues. The occurrence, prevalence and intensity rates for parasites and pathological
conditions were significantly lower in farmed population compared to the wild population at the study site.
Prevalence for parasites and pathologies were observed to be higher during dry season. The condition index (CI)
values, which indicate the general health status of the oysters, were also significantly higher for the farmed
population. The exposure period and the location of oysters in the habitat had a significant influence on the
condition index and parasitic load in the population. None of the parasites were OIE listed; however the presence
of a potential pathogen (P. beihaiensis) and pathological conditions warrants regular monitoring of the stocks and
water quality at the culture site.
Not Available
 
Date 2021-09-18T04:35:49Z
2021-09-18T04:35:49Z
2020
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/64352
 
Language English
 
Relation Not Available
 
Publisher Elsevier