In fish, the early stages of life are crucial to their survival. The structure of the larva assembly is influenced by the mode and place of reproduction, as well as other biological aspects that influence the vertical distribution of aquatic organisms on a daily scale in different environments. In this context, the objective of this study was to investigate the variation of fish larvae assemblages in the diurnal and nocturnal periods at different moments of the hydrological cycle (flood, flood, ebb and dry) in a floodplain of Central Amazonia, verifying the influence. Of environmental and limnological parameters. Samples were obtained in diurnal and nocturnal collections in the limnetic region, in different periods of the hydrological cycle, in the years 2010-2011 in the várzea observed. Fish larvae were more abundant during the night, however, the different environmental and limnological variables did not present significant correlations. The use of Amazonian floodplains as nursery areas for numerous species of fish is emphasized, confirmed by the presence of the initial ontogenic stages in all the hydrological moments of the study. The daily movement of the larvae was observed during the seasonal changes, thus, the observed variation explains the majority of the variability, being the general behavior and pattern of fish larvae in environments of the Amazonian floodplains.
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