Guanabara Bay (GB) is an estuary in Brazil, constantly the target of pollutants, such as mercury (Hg). Thus, our study aimed to evaluate (i) total mercury (THg) content in shrimp and squid species from GB; (ii) associate THg content to contamination in swimming crabs; (iii) explore potential differences between species, and size; (iv) correlate abiotic water data to the determined THg contents; (v) verify if Hg concentrations are below acceptable limits. Swimming crabs showed greater Hg contamination compared to other species. For shrimp only biometric variables are related to Hg, while for squid, only abiotic. Only squids did not show a correlation between Hg and animal size. Finally, the detected Hg values are below the tolerable limits established by legislations. Our results indicate that the dynamics of Hg contamination differs between groups and that further studies are needed to elucidate the mechanisms that affect bioaccumulation in different species.

瓜纳巴拉湾（GB）是巴西的一个河口，一直是诸如汞（Hg）等污染物的目标。因此，我们的研究旨在评估（i）GB中虾和鱿鱼物种中的总汞（THg）含量；（ii）将THg含量与游泳蟹中的污染物相关联；（iii）探索物种和大小之间的潜在差异；（iv）将非生物水数据与确定的THg含量相关联；（v）验证汞浓度是否低于可接受的限值。与其他物种相比，游泳蟹显示出更大的汞污染。对于虾，只有生物特征变量与汞有关，而对于鱿鱼，只有非生物变量。只有鱿鱼没有显示汞与动物大小之间的相关性。最后，检测到的Hg值低于法律规定的容许极限。