Changes in some water quality conditions in recycling water using three types of biofiltration systems during the production of the sharptooth catfish Clarias gariepinus (Burchell) - Part II: Growth and production of sharptooth catfish over a period of 78 days

An investigation into the growth and production of the sharptooth catfish C larias gariepinus (Burchell) was conducted over a period of 75 d in recircu lating water, using three types of biofiltration systems. Yields fluctuatin g between 195.2 kg and 242.1 kg were obtained with the mean fish mass per m (3) of water ranging between 19.5 and 22.5 kg. A biofilter system using PVC shavings was not only found to be the most efficient in the transformation of nitrogenous wastes, but also produced the highest growth and production of catfish as well as the best feed conversion ratio of the three biofiltr ation systems used.