Survey of surf clam (Paphia undulata Born) around Ko Ang Thong, Suratthani province
1994
Saramist Uraiwan (Southern Marine Fisheries Development Center)
Surt clam (Paphia undulata Born) around Ko Ang Thong, Suratthani province were found two large habitat areas, near Ko Ang Thong and between Chong Ang Thong-Pa Ngan. In the area near Ko Ang Thong, the average density was 10,814 kg/square km. The highest density was 36,285 kg/square km. The average size of the clam in this area was 3.5 cm, the average width of the clam was 1.0 cm, and the number per kilogram was 144-359, the average was 252. The estimate biomass of this area was 445,073 kilograms. In the area between Chong Ang Thong-Pa Ngan, the average density was 30,736 kg/square km. The size of the clam in this area was 3.8 cm. The average width of the clam was 1.1 cm. The number per kilogram was 136-230, the average was 161. The estimate biomass of this area was 1,370,480 kilograms. The distribution of the clam was along and near ko Ang Thong except in Chong Ang Thong-Pa Ngan, this area was abundanced in the middle between Ko Ang Thong and Ko Pa Ngan. The salinity of sea water was 34-35 ppt, DO was 6.8-8.2 mg/l. Sea water surface temperature was 30.2-31.0 deg C, pH was 7.9-8.3. Nitrite was 0-0.029 mg/l. Nitrate was 0-1.217 mg/l. Ammonia and Phosphate were 0 mg/l. The average of suspended solid was 25.5 mg/l.
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