The Amazon has fish of financial and food importance, and its main form of commercial distribution is through street markets, including in Monte Alegre, Pará. However, there are few studies on the variety of species offered in the municipality and how their trade behaves. Thus, this research diagnosed the fish found in municipal markets and aspects of local trade. The data were obtained through monthly interviews with fishmongers, over a period of one year. The price variation of the five most frequent species, considering the months and the seasonal period, was analyzed using ANOVA (one-way) and Kruskal-Wallis, considering α=0.05 and subsequent post-hoc tests. Thirty-one species were recorded, the main ones being tambaqui (Colossoma macropomum), pirarucu (Arapaima gigas), curimatã (Prochilodus nigricans), pirapitinga (Piaractus bachypomus), tucunaré (Cichla sp.) and surubim (Pseudoplatystoma sp.), which were the fish most frequently mentioned in the fishmongers' responses. The price of some of the most important species in the market in Monte Alegre was related to the seasonal period, with the highest market value during the flood period, as observed for pirarucu and curimatã. Tambaqui had the highest price in April, the month with the highest rainfall during the period studied. This research highlights the diversity of fish sold in Monte Alegre, confirming the importance of natural fishing resources for feeding local populations. In addition, the study demonstrates the correlation between the dry and rainy seasons and the price of fish, in which the commercial value of relevant species becomes higher during the rainy season.
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