Water samples were collected on three occasions around Phuket,
Mu Koh Phi Phi (Phi Phi) and Mu Koh Surin (Surin) (Fig. 1)
to coincide with Thailand’s monsoon and dry seasons. These locations
were selected because they provided a range of tourist intensities.
In 2007, Phuket attracted nearly five million tourists, Phi Phi
around 100,000 and Surin fewer than 25,000 (TAT, 2007; DNP,
2008). Three sampling sites (bays) were selected around Phuket,
and four around Phi Phi and Surin.