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M. P. Paulton, PhD
ICAR-Central Marine Fisheries Research Institute
Kochi, India
Indian brackish water oyster,
Crassostrea madrasensis (Preston)
 Indian brackish
madrasenis is endemic to Indian waters.
 The mariculture
of this species is gaining
momentum in Kerala & Karnataka among self help
groups with the technologies developed by
 Laboratory acclimated Oysters were exposed to
37ºC to 45ºC for one hour and observed for
survival to determine thermal limits (SLT & LT).
 Relative gene expression on thermal shock were
 Survival of LT or induced thermo tolerance was
studied in oysters recovering SLT.
Achievements ……..
Sub lethal (44ºC) and lethal temperatures (47ºC)
were determined for the species.
Overall up regulation of Hsp70, Hsp90, SOD, CAT
and GPX were observed in oysters recovering
from SLT.
Established the phenomenon of Induced thermo
tolerance by observing the survival of LT in
oysters recovering from the sub lethal thermal
Oysters showed 75% survivability up to 26 days,
of SLT exposure which is a record in any animals.
Outcomes and future prospects….
LT reported for the same species in the year 2003
(BARC) was 45ºC showing that the Indian edible
oyster increases its thermo resistance at par with
raise in water and atmosphere.
The study linked the up regulation of stress
management genes on exposure to SLT and the
survival of LT
The study provided scientific evidence about the
extra caliber of Indian Edible Oyster in combating
climate change and thereby considered as a
winner species which is prepared for stress.
Qualifies as a species for food security.