farming
facilities (Suvapeepun et al., 1984). A red tide also
occurred on the west coast of the Upper Gulf at about
this time, and paralytic shellfish poisoning (PSP) was
recorded for the first time in Thailand as a consequence.
The responsible organism was identified as the
dinoflagellate Gonyaulax sp. According to Suvapepan
(1995), 43 major red tides were recorded in the Gulf
during 1988–1995. 21 red tides were caused by Trichodesmium
sp., 17 were caused by Noctiluca sp. and the
rest by diatoms.