Estuaries are surrounding of Transistion enter and the continent and the ocean, where rivers find the sea, resulting in the measurable dilution of the salty water. This study was carried through in order to determine the composition and distribution of eggs and larval periods of training of fish (ichthyoplankton) of the estuaries of the rivers Curuçá and Muriá, located in the northeast state of Pará (Br). For this semimonthly collections in receding tides diurne and of quadrature from September of 2003 until July of 2004 had been carried through. They had been daily pay established four stations to the long one of the estuary of the two rivers. They had been carried through measured of condutivity, pH, temperature and oxygen dissolved and carried through samples to a meter of depth that had been made with a net with mesh of 500μm and 50 cm of mouth opening, in which was connected a fluxgate Samples had been conserved with formol 4%. They had been registered 1,326 larvae, being that of these, 451 had been showed in the river Muriá and 875 larvae in the Curuçá river. The identified larvae of fish belong to the 11 families (Engraulidae, Clupeidae, Gobiidae, Scianidae, Carangidae, Pleuronectidae, Tetraodontidae, Beloniidae, Soleidae, Achiriidae and Scorpaenidae). The biggest densities had been registered in the months of July, January and March. It did not have a space standard of distribution of the larvae with the ambiental variables. The estuary of the city of Curuçá was represented mainly by clupeiformes (family Engraulidae and Clupeidae), that they play important role in the trophic net of this ecosystem as well as excellent paper in the local feeding.
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