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Different studies on Litopenaeus vannamei (Boone, 1931) has performed in Iran, but less noted in water quality conditions. Water quality, in addition to creating optimal environment for the growth of vannamei shrimp, as well as cause the live food production and improve economic performance are produced. This study was conducted to evaluate the water quality environment vannamei shrimp in the south of Caspian Sea (Mazandaran province) and in the Caspian Ecology Reaserch Center. The results showed that the enrichment of water out of the ponds, can provide favorable conditions for water quality in the culture of vannamei shrimp with different densities.As a result, Mazandaran province environmental conditions (particularly temperature and salinity of the Caspian Sea) has perfectly suited for optimal growth vannamei shrimp. Therefore, vannamei shrimp (PL12) achieved a final individual weight of 21.1gr in a period culture of 85-day with a density of 35 ind/m2. Also, The nutrients and water quality parameters (Temperature: 27.4±1.79 ° C, Transparency: 10.7±1.2 cm, Salinity: 10.57±0.78 psu, pH: 8.42±0.38, Dissolved Oxygen 8.04±1.35 mg per liter) were within normal limits during the cultuer peirod. Iranian Fisheries Science Research Institute Published

This study done for detection of best stoking density Of Penaeus indicus in intensive culture with corrporatiny Abzian Bandar Co. in northern Tiab area (Hormozgan Province) In this research measuring many factors in clude: Temperature, Dissolve oxygen, salinity, pH, turbidity, biometric and hygien of condition of shrimps. The results show Dissolve oxygen level in after noon suitable but not suitable in early mornnig for growths of shrimp. Salinity levels in early cycle of culture high an in middle to end cycle of culture decreasiy becuase in creasiny of water exchange. Turbidity level of water growths of shrimp is good and Temperature with pH of water ishigh in standard level. The resultes of hygien condition show that with in creasing density percentage of infections of bacteria and fungus and also parasites in creasiny. Also resultes show growth of shrimp very down beacuse period of culture very long and middle daily growth for all treatments down for 0.9 g Also persentaye Pie survival showes that treatment 18 -.with middle 97.3% have highest survival and more economically to other treatments. In spite of stocking density increasiny but increasiny but income from sale of shrimp decreased. Iranian Fisheries Science Research Institute Published