In Mexico, most small-scale fisheries that catch fish lack adequate fisheries and biological monitoring. This leaves information gaps and hinders their management. It also complicates the recognition of these fisheries by international standards, as well as the existence of a social and economic benefit for fishermen and fisherwomen. In order to achieve a sustainable fish fishery (excluding sharks and rays) in Mexico, the actors involved in this fishery joined together, under a co-management and co-financing scheme that incorporates gender equality, to establish a fishery monitoring system that provides information to generate improvements in the fishery and its management. This has positioned the fisherwomen and fishermen as pioneers in fisheries sustainability, setting an example for many other fishermen.