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Background This is the first record of the alien shrimp Mierspenaeopsis sculptilis in Brazil. The invasion was detected within Marine Extractive Reserves based on eight specimens accidentally caught by local fishermen using trawlnets focused on fisheries of native species. These specimens were transported to the Laboratory of Applied Genetics and morphologically identified as Mierspenaeopsis sculptilis (rainbow shrimp). The taxonomic status of analyzed samples was confirmed by DNA barcoding using a 627-bp fragment of the Cytochrome C Oxidase Subunit I (COI) gene. Results A single haplotype was recovered from the eight specimens, being identical to a haplotype reported in India, where this species naturally occurs, and in Mozambique, where the rainbow shrimp is considered an invasive species. The present analyses indicated a putative invasive route (i.e., India-Mozambique-Brazil) mediated by shipping trade. Conclusions This study presents the first record of Mierspenaeopsis sculptilis in Brazil, in areas of extractive reserves on the Amazon coast. Notably exotic species can cause imbalance in the ecosystem, harming native species. In view of this, the registration of new invasions is essential as they contribute to the implementation of control plans.

Bragança is an important municipality in Brazil regarding fishery production. In spite of its important for regional economy, data related to local fisheries such as the production and consumption profiles of commercial species are scarce. Therefore, the goal of this study was to provide an inventory of commercialized fishes in the street market of Bragança along with commercialization parameters. The data collection comprised information based on a questionnaire directed to fishmongers in two sites of the street market (“mercado” or indoor market and “feirinha” or outdoor market) for a 17-month period. The analyzed data included the abundance, seasonality and price of the commercialized species. A total of 103 commercial names were reported, representing about 98 species from 40 families and 15 orders. The indoor and outdoor market differed in relation to consumer’s profile and to the structure, volume, variety, quality and prices of commercial species. The volume and the diversity of commercial species in the indoor market were inferior to those observed in the outdoor market. The most abundant species in the outdoor market were influenced by dry and rainy seasons. This work represents the most reliable analysis in the street market of Bragança, being relevant to the management of regional fisheries. Keywords: Bragança, M. ancylodon, fishing dynamics, fish.

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