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Abstracto
Effects of Stocking Density and Water Exchange Rates on Growth Performance of Tiger Shrimp, Penaeus Semisulcatus Cultured in Earthen Ponds
Gaber MM *,Omar EA ,Abdel-Rahim M ,Nour AM ,Zaki MA ,Srour TM
The trial was conducted in earthen pond with average initial weight of 4.5 ± 0.4 mg/PLs of green tiger shrimp, to examine the effect of three stocking density and two water exchange rate on growth performances, production traits and feed composition. Eighteen earthen ponds (2200 m2) were stocked with either, 5, 15 and 25 PLs/m3, and received either 10 or 20% of water exchange rate. The results revealed that, mean final weight (g/PLs), gain in weight (g/PLs), gain in weight %, SGR (% /day), feed conversion ratio, protein productive value (PPV), protein efficiency ratio (PER), fat gain and energy utilization were significantly (p≤0.01) the best at the lowest stocking density. While, total production exhibited significantly the opposite trend. There significant differences (P≤0.05) were found between water exchange rate in term of mean final weight (g/PLs), gain in weight (g/PLs), gain in weight %, SGR (%/day), feed conversion ratio, PPV, PER, fat gain and energy utilization. From the above results and the economic information of these study it can be concluded that, stocking density of 15 PLs/m2 of green tiger shrimp and 20% water exchange rate exhibited the highest net profit and would seem to be the most desirable density and water exchange rate in the system studied.