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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2018, 39 (5)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Salinity stress responses in Slipper cupped oyster

Crassostrea iredalei from Setiu Wetlands, Terengganu, Malaysia


M. Nadirah1,2, W.W.I. Nurhafizah1, A.S. Alia1, N.A. Iberahim1, A.I. Zamani3, A.S.A. Soh1, A.A. Laith1,2, K.L. Lee1 and M. Najiah1,2*

1School of Fisheries and Aquaculture Sciences, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia

2Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia

3Institute of Systems Biology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Malaysia

*Corresponding Author E-mail:




Key words


Crassostrea iredalei

Functional responses


Salinity stress




Publication Data

Paper received : 08.03.2017

Revised received : 07.6.2017

Re-revised received : 06.07.2017

Accepted : 28.12.2017



Aim: The present study investigated some important functional responses to salinity stress in Slipper cupped oyster Crassostrea iredalei from Setiu Wetlands, Terengganu, Malaysia.


Methodology: Slipper cupped oysters were subjected to different salinities of 7, 14, 28 and 35 ppt for 2 weeks. Total haemocyte count (THC), phagocytic activity, ionic absorption, total protein concentration (TPC), superoxide dismutase activity (SOD) and histological changes of the oyster tissues were determined after 2 weeks of experiment.


Results: THC significantly decreased at 7 ppt but increased at 35 ppt (p<0.05). The phagocytic activities were however not affected. The SOD activities were significantly higher (p<0.05) at 7 and 14 ppt compared with 28 and 35 ppt. Higher TPC were also observed at 28 and 35 ppt. Potassium ion concentration (mmol l-1) increased gradually with the increasing salinities. Salinity stress was also associated with histological changes in the gills and digestive gland tubules of the oysters.


Interpretation: The present study has revealed the functional responses of C. iredalei to salinity changes, and the negative impact of low salinities on the oyster immune system.



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