observed a significant reduction in Oscillatoria sp. (>15 Am) and
Cylindrospermopsis sp. (100 Am) biomass and a biomass increase in Chlorella
vulgaris (9 Am) and Cryptomonas sp. (15 Am) in silver carp enclosures; whereas in
Congo tilapia, Tilapia rendalli, enclosures biomass of C. vulgaris and Cryptomonas
sp. decreased and Oscillatoria sp. and Cylindrospermopsis sp. increased. In these
studies, the smaller phytoplankton escaped silver carp filtration and were seen to
dominate in the water column whereas the efficient filtration of small phytoplankton
by tilapia resulted in a proportional decrease in the smaller phytoplankton.