The Macrobrachium amazonicum is a freshwater prawn with ample fishing exploration in the Amazon region, virtue of the abundance and good acceptance in the consuming market. The aim of this study was to characterize the fecundity and fertility of M. amazonicum in two estuaries environments in the State of Pará. Of form that was accomplished monthly collections in the period of September 2008 the August 2009, in the city of Vigia and Belém in the Island of Mosqueiro, the females were until the Laboratory of Ecology Aquatic and Tropical Aquaculture - LECAT in the campus of the Agricultural University Federal of the Amazom - UFRA in Belém. For the determination of fecundity 30 females were collected monthly on average ovigerous of each point of collection, the eggs adhered to the pleopods were removed, using sodium hypochlorite as 2 % of active and stored chlorine in alcohol 70%. The individual fecundity was determined from the total counting of eggs. For a determination of the volume of eggs it was selected of each place of collection randomly 50% of the total number of destined females ovigerous the fecundity, following two groups: eggs pigmented and non-pigmented. To determine fertility, ovigerous females of M. amazonicum were stored in individual glass tanks 2L. After hatching, the larvae were siphoned and counted. For all females was measured the weight of each specimen and evaluated their biometrics with the aid of a precision caliper. Females of M. amazonicum coming from the Municipality of Vigia had absolute length between 4.8 and 9.3 cm and weighing between 2.21 and 11.81 g with absolute fecundity between 38 and 5749 eggs (2296 ± 1288 eggs). For females of Belém, from the island of Mosqueiro, the length varied between 3.71 and 8.14 cm, weight between 1.27 and 11.2 g with absolute fecundity ranged from 123 and 7571, mean 1448 ± 990 eggs. The volume of eggs for females obtained in the City Watch, referring to the non-pigmented eggs, had an average volume of 141.37 mm³, whereas for pigmented egg volume was 116.13 mm³. Females from the island of Mosqueiro, with non-pigmented eggs an average volume of 118.97 mm³ pigmented eggs and the average volume was calculated at 144.61 mm³. The analysis of fertility in the females of Vigia had a length between 5.41 and 9.72 cm and weighing between 2.51 and 9.60 g absolute fertility was 14 and 4430 larvae mean 1152 ± 822 larvae per female. The island of Mosqueiro had a length between 3.53 and 7.67 cm and weighing between 1.12 and 8.77 g of absolute fertility between 7 and 4121 and averaged 755 ± 871 larvae per female. The referring values fertility and fecundity for the Vigia and Belém - Island of Mosqueiro indicate that it has proportionality enters the variables of length and weight. Although showing lower fertility and fecundity values presented for breeding other species of commercial interest, the values shown here show that these two places the species meets provide arrays potential for aquaculture.
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