Muhamad Shaleh, Sitti Raehanah and Edrews, Dianecia and Mohammad Noor, Normawaty and Anton, Ann
(2010)
Effects of pH and water turbulence on the growth of harmful algae pyrodintum bahamense var. compressum.
In: Annual Seminar on Marine Science and Aquaculture: Indicators for Sustainability of Fisheries and Aquaculture, 10-12 March 2010, Universiti Malaysia Sabah.
Abstract
Pyrodinium, a red tide causing dinoflagellates are often related to toxicity cases particularly paralytic shellfish poisoning (PSP). Study on the effects of specific parameter on the growth it fy*ai"iin is essential to determine the potential factors r-esponsible for thek occurrences. The effects or iH ana turbulence on the growth of Pyrodinium bahamense var. compressun was conducted in laboratory under controlled conditions. P bahamense was cultured in nine different pH levels under two conditions; with and without water turbulence.
The experiments were conducted under constant light intensity 100 pmolm-2s{ at 25"C with photoperiod of 12h'light:12 h dark bycle. Cells were incubated for two weeks'and **pri"gr *";;;;" for growth
deterrnination every day at interval. This study shows thatP bahamenseattained the highest cell density (616
cells mT:t; when grown at pH 8-5 without water motion. However, in the presence of Ilow water turbulence
or water motion, the cell density is relatively low (128 cells ml,-r) at pH 8.5. These different outcomes might
be due to the growth inhibitory effect of water motion to P bahameise. Celldensities of p. bahamensewere
also found significantly lower at acidic conditions (< 7.0) and at higher pH (> 9.0)
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