The MAR Fish FSA Data Platform is a regional shared data resource that hosts the monitoring and characterization data collected from fish spawning aggregation sites monitored by partners in the Mesoamerican reef region. The objective of this regional data platform is to establish a collaborative and standardised system for FSA data collection and entry, ensuring greater data accuracy and comparability across the four MAR countries: Mexico, Belize, Guatemala, and Honduras. The tool is based on the Fish Spawning Aggregation Network’s standardised protocol for visually monitoring fish species, including details about site information and species data. The platform will enhance regional coordination, enhance data consistency, and improve analytical capabilities to support the effective management and protection of FSA sites at a regional scale.