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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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Relation http://eprints.cmfri.org.in/13943/
https://www.sciencedirect.com/science/article/pii/S0044848619309986
https://doi.org/10.1016/j.aquaculture.2019.734548
 
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
 
Creator Suja, G
Lijo, J
Kripa, V
Mohamed, K S
Vijayan, K K
Sanil, N K
 
Subject Fish Pathology
Fish Diseases
 
Description 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.
 
Publisher Elsevier
 
Date 2020
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/13943/1/Aquaculture_Suja%20G_2020_Comparison%20of%20parasites%2C%20pathological%20conditions%20and%20condition%20index%20of%20wild%20and%20farmed%20populations%20of%20Magallana%20bilineata%20%20from%20Vembanad%20Lake%2C%20west%20coast%20of%20India.pdf
Suja, G and Lijo, J and Kripa, V and Mohamed, K S and Vijayan, K K and Sanil, N K (2020) 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. Aquaculture, 515. pp. 1-8.