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Pathological investigations of Crassostrea madrasensis (Preston, 1916) in cultured and wild habitats from Southern India

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Relation http://eprints.cmfri.org.in/13669/
 
Title Pathological investigations
of Crassostrea madrasensis (Preston, 1916) in cultured and wild
habitats from Southern India
 
Creator Suja, G
 
Subject Edible oyster
Fish Pathology
Fish Biotechnology
Molluscan Fisheries
 
Description Edible oyster populations of the Indian coast are currently naive and
are not subjected to live introductions or trans-boundary movements. There
were no previous reports on edible oyster mortality due to disease out breaks in the country. Still, the major reported parasites in oysters over the
world have been observed in the present study within a low prevalence. The
two OIE listed pathogens, Bonamia ostrea and Marteilia refringens, the
protozoan, Perkinsus beihaiensis, the trematode, Bucephalus sp. and the
shell parasite Polydora sp. are those that have the potential to be a problem
for the future farming. Hence a comprehensive screening for pathogens in
other beds throughout the coastline is strongly recommended.
Presently oyster farming is getting popularized and is being extended
to more and more regions along the coast. At this stage, a good baseline data
on parasites and pathogens within natural environments is necessary for
proper disease management. The baseline data generated in this study will be
helpful for planning a health monitoring program in Crassostrea madrasensis
The farming site at Sathar Island was found to have the advantage of
producing oysters with high condition index and low incidence of parasites.
The duration of farming limiting to one year was found to be ideal since it
reduces the exposure period for parasite entry. But the presence of the major
protozoan parasites in the ecosystem should be considered while expanding
and intensifying oyster culture in future as the stressful condition can cause
parasitic proliferation in the ecosystem. A similar situation was observed in
mussel farming grounds along the west coast of India where a proliferation of
OIE listed protozoan, Perkinsus olseni was associated with intensification of
mussel culture. The nested primers developed for the major protozoan
parasites in this study can be used for screening the stocks for selecting brood
stock and for planning farming sites. As PCR screening using these primers is
more sensitive than the conventional methods, movement of infected stocks
to uninfected regions can be minimised based on this screening In conclusion, Crassostrea madrasensis stocks along the south
Indian coast (with respect to the stations studied) were found to be safe with
a low prevalence of pathogens. But, the comparatively higher burden of
parasites and pathological conditions observed in Tuticorin Bay indicates
the impact of contaminant exposure. Thus for maintaining the good health
status of oyster stocks, periodic surveillance and monitoring are necessary
and also the water quality should be regularly monitored for better control
over the chances of disease out breaks especially around the cultured areas.
 
Date 2018
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/13669/1/Suja%20G_2018_Thesis_Pathological%20investigations%20of%20Crassostrea%20madrasensis%20%28Preston%29.pdf
Suja, G (2018) Pathological investigations of Crassostrea madrasensis (Preston, 1916) in cultured and wild habitats from Southern India. Doctoral thesis, ICAR- Central Marine Fisheries Research Institute.