Studies on small aqaculture recycling systems with special reference to feed and feeding practices

in the present study attempet has carried out for comparing the three biological filters and select the best one of them, then testing three levels of protein in fish diets to reach the sutibe level of protein in tilapia diets, by rearing fish in tanks equipped with the selected biofilter type. finally different feeding frequencies done to chose the suitable feeding frequency for tilapia production, using a small aquaculture recycling systems to applys such systems in family scale for producing edible fish in urban as will as in other environments.