Changes of dissolved oxygen and transparency in shrimp culture ponds (Hormozgan Province - Tiab)

Dissolved oxygen and transparency are two main factors in management of shrimp culture. In this regard, three Indian white shrimp culture farms in Tiab region were selected and in each farm three ponds were studied randomly. Dissolved oxygen samples were collected two times per day (morning and evening) from surface and maximum depth of the ponds. The transparency of water was measured by secchi-disk daily, at 15:00 P.M. The Results showed that amount of dissolved oxygen in afternoon samples more than 3.5 mg/lit which is suitable for growth of shrimp but in morning time samples the level of Dissolved oxygen were unsuitable especially in ponds which were not equipped with any aerator. Also, the long-arm aerators showed higher and better efficiency than short-arm aerators. From point of transparency, the results showed that in the beginning of culture period, the transparency was high (more than 100 cm) and gradually decreased