The removal of phytoplankton cells from aquaculture systems generally results in the reduction of
nitrogenous waste and improves water quality. With this study, the effects of chitosan concentration,
environmental condition and pH adjustment on flocculation of phytoplankton in marine shrimp
(Litopenaeus vannamei) culture tanks were investigated. The remaining phytoplankton and suspended
solids in the system were indicators for evaluating the efficiency of chitosan on flocculation.