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Com o objetivo de avaliar o comportamento, a sobrevivência e desenvolvimento de larvas saudáveis de <em>Poecilia reticulata</em> submetidas à profilaxia contra bactérias, fungos e parasitas, foi conduzido no Laboratório de Aqüicultura da Universidade Estadual de Maringá, Estado do Paraná, um experimento delineado ao acaso com 6 tratamentos (controle, azul de metileno, cloranfenicol, formalina, KMnO4 e NaCl) e 4 repetições. Os banhos profiláticos variaram conforme o tratamento, de 30 minutos a 48 horas. Posteriormente, avaliou-se, por 20 dias, o desenvolvimento dos animais. A análise comportamental realizada durante o banho mostrou que, quando expostos à formalina, os animais perdiam o senso de direção e chocavam-se contra a parede. O desenvolvimento das larvas no tratamento com cloranfenicol apresentou-se melhor (P < 0,05) em relação ao tratamento com formalina. Quanto à sobrevivência, não houve diferença entre os tratamentos. Sendo assim, quaisquer metodologias empregadas neste estudo podem ser aplicadas quando relacionadas à sobrevivência. Ao se avaliar o crescimento, deve-se dar preferência à profilaxia com cloranfenicol em vez de formalina Aiming to evaluate the behavioural, survival and developmental responses of healthy larvae of <em>Poecilia reticulata</em> subjected to the prophyllatic against bacteria, fungi and parasites, a randomized experiment was carried out at the Aquaculture Laboratory of the State University of Maringá, state of Paraná, using six treatments (control, methylene blue, chloramphenicol, formalin, KMnO4 and NaCl) and four repetitions. Length prophylactic treatment varied from 30 minutes to 48 hours. After bath treatment, animals’ growth was evaluated during the following 20 days. Behavioural analysis during bath treatment showed that when the animals were exposed to formalin, they lost their sense of direction and collided against the wall. In the treatment with chloramphenicol, development of the larvae was better (P < 0.05) when treated with formalin. In relation to survival, there were no differences between the treatments. Thus, any methodology may be applied in this study when related to survival. Prophylaxis with chloramphenicol is the preferred treatment to formalin when evaluating growt

acta scientiarum. animal sciences

Comportamento, sobrevivência e desenvolvimento de lebistes, &lt;em&gt;Poecilia reticulata&lt;/em&gt;, submetidos a agentes utilizados na profilaxia de doenças