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Este experimento teve por objetivo avaliar a predação de larvas de Odonata (Pantala sp.) em diferentes fases de desenvolvimento sobre pós-larvas de curimba, Prochilodus lineatus (Characiformes, Prochilodontidae). Foram utilizadas 54 larvas de Odonata distribuídas em oito grupos de comprimento (2,54; 3,89; 6,37; 9,67; 10,98; 12,81; 18,50 e 24,50 mm). Essas foram colocadas em 27 aquários com capacidade para 1,0 L de água, com iluminação constante por lâmpadas florescentes (40 watts), sendo inseridas duas larvas de tamanho similar por unidade experimental. Em cada aquário foram colocadas 15 pós-larvas de curimba (Lt: 6,20±0,22 mm e Wt: 0,91 mg) às 18h, sendo que a cada três horas (21, 0, 3, 6, 9, 12, 15 e 18 horas) foram contadas as pós-larvas vivas e realizada a reposição das que faltavam. Os parâmetros físicos e químicos como o pH, oxigênio dissolvido, condutividade elétrica e temperatura, foram tomados no início e no final do experimento, sendo os valores médios desses de 7,83±1,11; 6,57±1,23 mg/L, 212,71±3,93 µS/cm e 27,19±0,27ºC, respectivamente. Observou-se efeito quadrático do tamanho das larvas de Odonata sobre o número total de pós-larvas de curimba consumidas com ponto máximo com larvas de Odonata com 24,46 mm. Verificou-se, ainda, redução no número de larvas consumidas ao longo do período experimental. Conclui-se que ocorre aumento no número de larvas de curimba predadas com o aumento no tamanho das larvas de Odonata The aim of this experiment was to evaluate the predation of dragonfly (Pantala sp.) fry in different development phases by the Prochilodus lineatus post-larvae (Characiformes, Prochilodontidae). Fifty-four dragonfly fry were distributed among eight length groups (2.54, 3.89, 6.37, 9.67, 10.98, 12.81, 18.50 e 24.50 mm), then they were also distributed among 27 aquarium (1.0 L), with constant illumination by fluorescent lamps (40 watts), and two dragonfly fry of similar size were put in each experimental unit. The P. lineatus post-larvae (Lt: 6.20±0.22 mm and Wt: 0.91 mg). 15 P. lineatus post-larvae were distributed in each aquarium (18:00h), each three- hour-interval (21.00, 0.00, 3.00, 6.00, 9.00, 12.00, 15.00 e 18.00h), the live post-larvae were counted and the dead ones were replaced. The physical and chemical parameters pH, dissolved oxygen, electric conductivity and temperature was measured in the beginning and in the end of the experiment, the average values of these ones were 7.83±1.11, 6.57±1.23 mg/L, 212.71±3.93 µS/cm and 27.19±0.27ºC, respectively. A quadratic effect of the dragonfly fry size on the total number of P. lineatus post-larvae eaten with maximum point with dragonfly larvae of 24.46mm. was observed. And a decrease in the number of post larvae eaten in time of the experimental period was also observed. It may be concluded that there was an increase in the number of P. lineatus post-larvae eaten with a size increase of dragonfly fr

Predação de pós-larvas de curimba (Prochilodus lineatus, Valenciennes, 1836) por larvas de Odonata (Pantala, Fabricius, 1798) em diferentes tamanhos