investigating the situation of non-biological factors (physicochemical measures) ponds of shrimp (litopeneus vannamei) water in complexes of helle in bushehr

this research aimed to assess factors of water quality in ponds l. vannamei in site of bushehr helle and provide solutions to improve water quality shrimp l. vannamei were conducted in this area, during the period of 120 days. this studies was conducted across the 7- hectare pond with a density of 22 shrimp per square meter in breeding site of bushehr helle in 2013. from parameters of water oxygen temperature, salinity, ammonia and ponds water nitrite was done samplin every 15 days. the studied parameters during the breeding period were no in regular trend. most changes were observed in the parameters from the second month of breeding (mid- july) until late period (september). according to the results, the rate of temperature (30.93±2.98 °c), salinity (47.68±5.16 mg/l) and water ammonia (1.91±0.46 mg/l) were higher than the limit for the shrimp environment. amount of oxygen (3.62±0.77 mg/l) and nitrite (0.007±0.006) parameters were in appropriate limit for the shrimp (l. vannamei) environment. in order to achieve optimum production, a revision of fertilization, feeding, water changes and using aeration in ponds, especially in the second month of rearing seems to be necessary