MONITORING OF SOME PHYSICAL AND CHEMICAL WATER PARAMETERS IN HIGHLY INTENSIVE MARINE SHRIMP CULTURE UNDER HYPER SALINE CONDITIONS

As well as Penaeid shrimp growing out develops under median hyper saline levels of 43%0 in monitored growing out highly intensive cultured shrimp ponds, the physical and chemical water quality parameters were kept about optimal and appropriate levels for the cultured shrimp. Dissolved oxygen, log of hydrogen ion concentration, temperature, salinity, transparency, total nitrogen ammonia and nitrite nitrogen were continuously, regularly and daily measured for 152 days as the pond growing out period after 42 days of nursery period. In this study the minimal and the maximal ranges of the measured physical and chemical water quality parameters were around reared Penaes indicus shrimp capability to tolerate, alternate and accommodate its physio- logical life conditions for these monitored levels of these hydrological parameters. Although, some of these monitored parameters were deviated from the necessary optimal levels in some days in some studied ponds, then, controlling and correction of the impaired parameters were directly applied in any affected pond as quickly as deviation was discovered. Therefore, the productivity of monitored ponds at harvesting time was very good in all surveyed ponds (No. 1, 2, 3 and 4) and equals 22.174, 21.921, 22.330 and 22.227 mt /ha/ crop as well as with appropriate survival rates of 77.9, 78.3, 76.8 and 77.5% respectively. Feed conversion rates for surveyed ponds were high and equal as 2.69, 2.60, and 2.75 and 2.71 respectively. It is concluded that controlled water quality parameters in growing out highly intensive cultured shrimp ponds will lead to benefit results of good health and better quality shrimp production and acceptable survival rates with good harvesting productivity. It is advisable for intensive shrimp growing out ponds that their physical and chemical water parameters must be under continuous, regular and daily observation and checking by physical detection and chemical analysis for obtaining good hygienic and economic product.