Doses letais de verde malaquita utilizado em (Poecilia reticulata)

Abstract

Lethal doses of malachite green used in (Poecilia reticulata) Studys with medicines and treatment for ornamental fishes are still incipients. Accordingly to that, this labor aimed examining the malachite green's lethal doses, which is being used for treatment of ornamental fishes deases. The tests were performed with 80 subjects (Poecilia reticulata), the fishes were distributed in 20 water carriers 3L, with constant aeration. Were used 5 treatments with 4 repetitions. Successively measuring levels of 0,0 mg/L, 0,6 mg/L, 1,2 mg/L, 1,8 mg/L and 2,4 mg/L. Subsequently, were analyzed for 96 hours, the animal's behavior and mortality, such as water quality parameters. The results showed that, when exposed to malachite green, the animals packed in doses equal or higher than 1,2 mg/L losing sense of direction and quickly died. Occurring mortality of 50% to 0,6 mg/L, 100% to 1,2 mg/L, 93,75 to 1,8 mg/L and 100% to 2,4 mg/L. First mortalities were 40 minutes after the experiment began. The values of physico-chemical parameters remained at appropriate levels for fish farming. Presented the results, concludes that malachite green used in the experimental drug doses above 1.2 mg / L of malachite green were applied lethal to this species after 96 hours and the LD50 was obtained at a concentration of 0.6% mg / L.