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Hydrogen peroxide and chlorine dioxide against parasite Ichthyophthirius multifiliis (Protozoa, Ciliophora) in jundiá fingerlings

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portuguesA ictiofitiriase em peixes tem distribuicao mundial e forte impacto economico na piscicultura de agua doce devido as altas taxas de mortalidade associadas. Este estudo avaliou o uso do peroxido… Click to show full abstract

portuguesA ictiofitiriase em peixes tem distribuicao mundial e forte impacto economico na piscicultura de agua doce devido as altas taxas de mortalidade associadas. Este estudo avaliou o uso do peroxido de hidrogenio (H2O2) e do dioxido e cloro (ClO2) no controle do parasito protozoario Ichthyophthirius multifiliis em jundia. A concentracao letal mediana (CL50, 96h) de cada agente quimico foi estabelecida, assim como a concentracao minima inibitoria do peroxido de hidrogenio para a fase larval infecciosa do parasito (teronte). Os agentes foram testados assincronicamente em alevinos parasitados na forma de banhos de curta e longa duracao, nas seguintes concentracoes e tempos de exposicao: 1. Peroxido de hidrogenio: (T1) banho continuo - 30ppm e (T2) 50ppm; (T3) banho curto - 150ppm com duracao de 1h e (T4) 250ppm com duracao de 1h, alem de um grupo controle (sem a adicao do agente quimico). 2. Dioxido de cloro: (T1) banho continuo - 4ppm; (T2) banho continuo - 20ppm; (T3) banho curto - 200ppm, com duracao de 1min; (T4) banho curto - 400ppm, com duracao de 1min, alem de um grupo controle. A analise dos dados indicou a concentracao de 82,54ppm do produto comercial utilizado (ou 24,76ppm do principio ativo) como a Cl50, 96h de H2O2 e de 38,4ppm produto (ou 2,68ppm do principio ativo) para o ClO2. A concentracao de H2O2 que causou 100% de mortalidade dos terontes em 1h foi de 25ppm (do produto, ou 7,5ppm do principio ativo). Ao final do quarto dia de experimento curativo, 98% dos animais morreram devido a ictiofitiriase. Nenhum dos tratamentos foi efetivo frente a parasitose. Palavras-chave: “ictio”; parasito; Rhamdia quelen; farmaco; tratamento EnglishIchthyophthiriasis is a worldwide fish disease with great financial impact on freshwater fish farming due to its associated high mortality rates. Current study assesses the parasiticidal capacity of hydrogen peroxide (H2O2) and chlorine dioxide (ClO2) against the causative agent, Ichthyophthirius multifiliis, in jundia. Median lethal concentration (LC50, 96h) of each chemical agent was established, as well as the minimum inhibitory concentration of hydrogen peroxide for the parasite´s infectious larval phase (theront). Products were tested asynchronously in parasitized fingerlings for short and long baths at the following concentrations and exposure times: 1. Hydrogen peroxide: (T1) continuous bath - 30ppm and (T2) 50ppm; (T3) short bath - 150ppm, during 1h and (T4) 250ppm during 1h; control group (without any chemical agent). 2. Chlorine dioxide: (T1) continuous bath - 4ppm and (T2) 20ppm; (T3) short bath - 200ppm, during 1min; (T4) short bath - 400ppm, during 1min and control group. Data analysis demonstrated a concentration of 82.54ppm of the commercial product (or 24.76ppm of the active chemical agent) as LC50, 96h of H2O2 and 38.4ppm product (or 2.68ppm of the active chemical agent) for ClO2. Hydrogen peroxide concentration causing 100% mortality rate of theronts in 1h was 25ppm (product, or 7.5ppm of the active chemical agent). At the end of the fourth day of curative experiment, 98% of the animals died by ichthyophthiriasis. No treatment was effective against the parasite. Key words: “ich”; parasite; Rhamdia quelen drug; treatment

Keywords: agent; hydrogen peroxide; chlorine dioxide; banho; ichthyophthirius multifiliis

Journal Title: Ciencia Rural
Year Published: 2017

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