بررسي آثار سطوح مختلف انرژي و شوري بر توان توليد ميگوي سفيد هندي

Effects of Energy and Salinity on the Growth Performances of Indian White Shrimp (Fenneropeneaus indicus H.Milne Edwards)

A 3x3 factorial experiment was conducted for 60 days to determine the response of Indian white shrimp (Fenneropenaus indicus, H. Milne Edwardes) juvenile to diets containing various energy levels. Three semi-purified and isonitrogenic diets containing three levels of energy (3500, 3800 and 4100 kcal/kg) with a constant protein content of 40 % were formulated, then prepared in this trial. Each diet was evaluated in three levels of salinity (25, 35 and 45 ppt). So the study was conducted with 9 treatments in triplicate random groups of 20 shrimp (average weight of 3.22±0.19 g) per each 300- litre tank. Each tank was filled with 200 litres of water 50 percent of which was exchanged every day. The shrimp were fed their respective diets on a saturation basis with the feed divided into three parts to be fed at 08:00, 14:00 and 20:00 hrs. daily. The results of the study indicated: with increase in energy and decrease in salinity, growth performances improved. Diet containing 4100 kcal/kg energy and salinity of 25 ppt (4100 : 25) in view of weight gain, SGR, FCR, PER, NPU and yeild was significantly (p<0.05) better than other energy and salinity levels. Furthermore, the study showed that 25 ppt salinity was significantly (p<0.05) better than other salinities for this shrimp culture. Carcass analysis of shrimp (except for energy and lipid) was not significantly affected (p>0.05) by increasing levels of dietary energy. Increasing lipid and energy content tended to have an effect on carcass analysis proportional to the increase in dietary lipid and energy. Salinity interaction did have a significant effect (p>0.05) on an approximate analysis of shrimp carcass.