The effects of different feed on water quality fluctuation in closed freshwater prawn (Microbrachium rosenbergii) production system

Abstract

This experiment was carried out to study the effects of different feed on water quality fluctuation in a closed freshwater system. The experiment were carried out in Marine Hatchery of UMT by culturing juvenile of Macrobrachium rosenbergii in static water culture system. Stocking density of the prawn juveniles was 0.5 pcsL- 1 • Four treatments of different diets were given to the prawns in three replicates. Treatment 1 was as control, consisted of commercial prawn pellet (CP 9004#), treatment 2 was pellet made of boiled chicken liver; treatment 3 was pellet made of raw chicken liver, and treatment 4 was ground Cargill starter feed. Water quality parameter such as temperature, pH, DO, unionized ammonia (NH3), nitrite, and ortho-phosphate were analyzed once a week. The experiment consisted of eight weeks cultural activity. At termination of the experiment, At termination of the experiments, there was no significant difference (P>0.05) between treatments for the ammonia and nitrite concentration. Treatment 4 showed the highest ortho-phosphate concentration (3.26ppm). For the survival rate estimation, Treatment 1 (control) showed 94.17% of juvenile survival rate, Treatment 2, 3, and 4 showed 80%, 70.83% and 98.33% survival rate respectively. There was significant difference (P<0.05) among the diet treatments.