Journal of Environmental Biology

Physical factors affecting oyster diversity and distribution in Southern Thailand

Paper received : 17.11.2017                          Revised received : 26.02.2018                          Re-revised received : 10.07.2018                          Accepted : 03.09.2018

Authors Info

S. Chumkiew,

M. Jaroensutasinee*,

F.W. Tina, K. Jaroensutasinee and P. Koad 

Centre of Excellence for Ecoinformatics, School of Science, Walailak University, Nakhon Si Thammarat-80161, Thailand

*Corresponding Author Email :

mullica.jn@gmail.com

Abstract

Aim: Studies on oyster population dynamic is essential for effective oyster aquaculture.Bandon Bay in Southern Thailand is a major shellfish aquaculture site of high commercial value. The aim of this study was to evaluate the influence of environmental factors on oyster diversity and their distribution in Bandon Bay.  

Methodology: Adult oysters were collected from eight aquaculture sites during low tide and their body sizes were measured. Monthly, transparency, salinity, pH, dissolved oxygen, biochemical oxygen demand, alkalinity, ammonium (NH₄-N), nitrite, nitrate and phosphate were recorded from Surat Thani Coastal Fisheries Research and Development Centre,  Department of Fisheries.

Results: Three oyster species were observed: Crassostrea belcheri, Crassostrea lugubris and Saccostrea forskalii, however, C. belcheri was most abundant at most locations. Oyster density in Bandon Bay was mostly influenced by alkalinity, followed by salinity, pH, NO₃ and NH₄-N.

Interpretation: Since oyster reproduction, survival and shell development depend on environmental factors, thus studies on relationships between environmental factors and oyster occurrence/density may provide a better understanding about the community structures and spatial dynamics of oysters, as well as how oysters respond to environmental changes.

Key words: Bandon Bay, Crassostrea belcheri, Crassostrea lugubris, oyster, Saccostrea forskalii, Water quality

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