Fishing agreements are community and inter-community initiatives designed to regulate fisheries in floodplain (várzea) lakes in the Amazon region. Initially, lacking legal recognition, these agreements were officially acknowledged by the Brazilian Government in 2002 as a fisheries management instrument. Their regulation was later transferred to the states under Complementary Law 140/2001, and in Pará specific guidelines were established with the publication of Decree No. 1686 in 2021. This text explores the process of revitalizing fishing agreements as a tool for fisheries co-management and environmental conservation in the lower Amazon, focusing on the cases of Arapixuna and Lago Grande. These territories face significant fishing pressure and other socio-environmental threats. The fishing agreements for those regions, originally approved in 2004 and 2005, were considered outdated by local fishing communities. In response, the Regional Sustainable Development Councils of Lago Grande and Arapixuna reviewed these agreements in 2018 and submitted revision proposals to the environmental agency between 2018 and 2019. After the publication of the aforementioned decree in 2021, the evaluation process of these agreements started, leading to the approval of three fishing agreements in the lower Amazon, including that of the Lago Grande. This legal framework recovered the foundations of the artisanal fisheries co-management policy in Pará, offering a significant contribution to the socio-environmental sustainability of the Amazon floodplain.