AN INVESTIGATION ON THE GROWTH AND SURVIVAL OF RUTILUS JRISSI KUTUM IN GEOMEMBRANE TANKS

An investigation was carried out on the sustainablity and growth rate of Rutilus frissi kutum larvae in polyethylene tanks in Ghazian Aquaculture Research Station, Guilan Province. The results were compared to those recorded for the currently used tanks including fiberglass and glass aquariums. Three treatments each with three replications were designed and the tanks were stocked with 30 fishes, with an average initial weight of 650 to 746 mg. The tanks were filled with 70 liters of water and the experiment was conducted for 60 days. The fish were fed with concentrated food during the rearing period. The fish showed an increase rate of 625.88, 643.54 and 659.48 mg in fiberglass, aquarium and polyethylene tanks, respectively. No significant difference was observed in the indices special growth ratio (SGR), food conversion ratio (FCR) and weight gain (P>0.05). The research indicated that the high-density polyethylene tanks made are more suitable for Rutilus frissi kutum culture than fiberglass and aquarium tanks.