Phy toplankton composition and production in Paya Bungor, Pahang, were studied from October
1981 to Septemoer 1982 and from January to December 1982 respectively. Phytoplankton diversity is in
the order of Chlorophyta> Bacillariophyceae > Cyanophyta> Chrysophyceae > Euglenophyta >
Phyrrhophyta; but the order in terms or ab~ndance is Cyanophyta> Chrysophyceae > Chlorophyceae>
Bacillariophyceae. The brown water system of Paya Bungor seems to contain a higher phytoplankton
production than the white water system. Maximum production generally occurs at the top layer of the
water, but shifts to the subsurface layers on hot days due to photo-inhibition at the surface. Generally,
nutrient and light energy are the two most important factors controlling phytoplankton production in
Paya Bungor
