Toxic effects of organochlorine pesticides on Penaeus vannamei. Shrimps in Sinaloa, Mexico

The shrimp fishery in the State of Sinaloa, Mexico, has decreased due to various causes. Recent studies have reported significant residues of organochlorine pesticides; thus, this work evaluated the toxic effects of some pesticides on the shrimp Penaeus vannamei. Juvenile shrimp were exposed to chlordane, DDT, lorsban and fndane to estimate the 50% lethal concentration (LC 50) at 48 h. The LC 50'S were: 0.0632, 0.0087, 0.0048 and 0.0039 mg/l respectively for each pesticide. Shrimp were treated with sublethal concentration of pesticides to determine changes in the respiration and in the amount of protein. The % of protein in exposed shrimp, decreased 28.5, 41.8, 36.9, and 37.6 for shrimp exposed to chlordane, DDT, lorsban and lindane, respectively. The shrimp treated with pesticides registered increases in the respiration compared to controls ones. These results indicate that pesticide pollution represent a potential danger for fishery and aquaculture in Sinaloa.