CALCIUM SILICATE AS LIMING MATERIAL FRONT OF THE TRADITIONAL LIMESTONES

Liming products are important in the pond management to keep the productivity and fish health. The experiment evaluating the effect of the liming managements was care out during 59 days, in laboratory of EW Shell Fisheries Center, Auburn University in Auburn AL, USA. To better evaluate the limnic managements was selected a pond with water with low alkalinity, in order to obtain water to the experiment. To compare the lime products were used, 20 aquariums (18 L) with five treatments, were these: (Water) tank containing water only: (Water and soil) water and soil; (Calcium) soil, water and calcium carbonate (CaCO3); (Magnesium) soil, water and dolomitic limestone (CaCO3, 50%: MgCO3, 40%) and (Silicate) soil, water and calcium silicate meta (CaSiO3). Twice a week were measured, alkalinity, pH, conductivity, temperature and oxygen. The calcium silicate is an adequate product to use with lime in aquaculture, when compared with calcium carbonate and dolomite, traditional liming products. The soil possibilited the more stability of environment that the water alone.