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Phosphorus in Aquaculture Ponds: Controlling Technique and its Bioavailability to Cyanobacteria




Hamid, Ansley

Type of Degree

Master's Thesis


School of Fisheries, Aquaculture, and Aquatic Sciences

Restriction Status


Restriction Type


Date Available



Understanding the loading, speciation, and bioavailability of phosphorus (P) in aquaculture ponds is important for controlling P and harmful algal blooms. This thesis first explored flue-gas desulfurization (FGD) gypsum as a P sorption remediation technique and found that FGD gypsum can effectively remove P from water. The loading and speciation of P on different-sized particles in water collected from aquaculture ponds were then examined by the Hedley extraction method using different reagents. The conditionally bioavailable P extracted by NaOH represented the largest P pool (NaOH-P), followed by bioavailable pools of H2O-P and NaHCO3-P. Small colloids (100–450 nm in size) contained the highest total P (TP) and inorganic P (IP) concentrations, while small nanoparticles (1–50 nm) exhibited the highest organic P (OP) concentration. Bioassay experiments for the cyanobacterium Microcystis aeruginosa with the same TP concentration supplied by different-sized particles showed side-induced growth trends and suggest transformation between IP and OP.