Assessment of Sediment Quality on Surf Clam Resource in the Western Part of Trat Bay, Trat Province
Abstract
Assessment of sediment quality on surf clam resource area in In the Western Part of Trat bay was carried out, The research was focused on sediment and water qualities such as sediment grain size, total organic matter (TOM), acid volatile sulfides (AVS), dissolved oxygen, temperature and salinity. Twelve stations were investigated in July (early rainy season) October (late rainy season) 2020 and January (dry season) 2021. Our results indicated that the general water qualities were in good condition for aquatic life, the dissolved oxygens were higher than 4 mg/l and the salinity was in the average of 21.0±9.4 psu. The sediment grain sizes were less than 63 µm, the total organic matter was in the range 5.10-16.81 %, the acid volatile sulfide was in ranged 0.000-0.270 mg/g dry weight. The sedimentary TOM and AVS in the lower part of Trat Bay were in comparatively higher levels. The AVS factors were increased with the increase TOM (P<0.05). In the overall view, the sediment quality was normally in good condition for the living of surf clam. Nevertheless, monitoring of TOM situation and increasing AVS, which related to the risk of from low oxygen conditions (hypoxia) that could effect to surf clam should be performed
Keywords : sediment quality, surf clam resource, Trat bay
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