Download M.P.Paulton Central Marine Fisheries Research Institute, Cochin

M. P. Paulton, PhD
ICAR-Central Marine Fisheries Research Institute
Kochi, India
Indian brackish water oyster,
Crassostrea madrasensis (Preston)
Approach….
 Indian brackish
water
oyster
Crassostrea
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
CMFRI.
 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
studied.
 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
shock.

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.