An Investigation on the possibility of utilization of chemical material for mitigation of Cochlodinium sp. bloom and their impact on the Litopenaeus vannamei shrimp

Cochlodinium polykrikoides is a common red tide former associated with fish kills in the most coastal waters of the world. Pay attention red tide problems to human and environment, forecast and control of algal bloom are aim of a lot of coastal environmental studies. Following Cochlodinium polykrikoideswas bloom in Oman Sea and Persian Gulf, extensive mortality of aquatic animal were seen in 2008, instances verified extensive damaged to wetland habitats during algal bloom. In this study have been tried for finding a suitable chemical composition for Mitigation of Cochlodinium polykrikoides bloom in wetlands. To identify the safe chemical substance against red tide in coastal waters wetlands, concentration effects of 0.01 mg/l, 0.04 mg/l, 0.4 mg/l, 1 mg/l and 1 gr/l Magnesium Hydroxide, Poly Aluminum Chloride (PAC), Aluminum Sulfate, Sodium Hypochlorite, Calcium Carbonate, Ferrous Sulfate, Starch on Laboratory cultures of Cochlodinium polykrikoides (1000000 cell/lit) and Litopenaeus vannamei were studied in Iranian Shrimp research center. Cochlodinium polykrikoides were cultured under a cool white fluorescent light of 2000 lux intensity with a 12:12 h light: dark cycle. Temperature and salinity were controlled 28 °C and of 30 g/l (ppt), respectively. Finding show that, all concentration of above substance, completely disintegrated of cultured Cochlodinium polykrikoides. Also except 1 g/l Sodium Hypochlorite, in other concentrations of studied substances, there weren’t seen shrimp mortality after 96h. Among studied substance, starch have limit effects on the shrimp health and environment, therefore it can be suitable for controlling of Cochlodinium polykrikoides in shrimp ponds