Abstract
A large amount of feed and other organic material is found as suspended matter in super intensive fish production tanks. Both treatment and recycling of these organic materials depend on the size and stability of the particles in suspension. The stability of suspended material and the states of dispersion or flocculation were studied extensively by colloid chemists. The effects of pH and electrolyte concentration on colloidal stability of suspended particles collected in super intensive hybrid tilapia ( Oreochromis niloticus× Oreochromis aureus) tanks, operated as an active suspension pond (ASP), were studied here. Higher salinity led to better flocculation of the suspended matter. The point of zero salt effect (PZSE) of the particles was found to be at a pH range of 2.8–4.2, similar to the isoelectric point (IEP) range commonly found in bacteria. Using multiple regression analysis, 92% of the colloidal dispersion variation was attributed to changes in solution ionic strength; addition of pH to model increased the model adjusted- R 2 from 0.92 to 0.98. Our results suggest that in intensive fish production tank, the lower the water salinity and the higher the pH, the more stable would be the colloidal suspension.
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