Shrimp is an important fishery resource, either for consumption by the community or as an export product. Among the families with interest for fishing are: Palaemonidae and Penaeidae. This work provides preliminary data on the species occurring in Vigia, Pa, as well as some biometric data of the species Penaeus subtilis. The samples were collected from February 1995 to December 1995 at intervals of one month in three specific sites: Boca de Vigia (open area), Praia de Vigia (transition) and Igarapé Anuerá (inland) with a 151mn trawl. We calculated the diversity index for each season and site, richness index for each season, carapace length frequency for each site, regression between carapace length and total length, and analysis of variance between sites for P. subtilis. A total of 4892 specimens belonging to seven species were collected. For each season there was a difference in the number of species. The diversity index in the dry season was higher than in the rainy season due to the presence of both Caridea and Penaeidea individuals while in the rainy season there were only Caridea individuals. In the rainy season the highest diversity index occurred in Praia de Vigia, while in the dry season, the highest index occurred in Boca de Vigia. The highest richness index occurred in the rainy season. Through the regression analysis it was observed that the total length is 4.57 times bigger than the carapace length. Through the analysis of variance it was observed that the individuals of P. subtilis in the three collection sites cannot be considered from the same population. The frequency of carapace length at the collection sites was between 8.00 mm and 13.00 mm. These lengths are considered in the literature as corresponding to young individuals, this indicates that the region studied is a nursery for recruitment of the species P. subtilis.
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