The EU-funded project AQUA-USERS will provide the aquaculture industry with user-relevant and timely information based on the most up-to-date satellite data and innovative optical in-situ measurements. The key purpose is to develop an application that brings together satellite information on water quality and temperature with in-situ observations as well as relevant weather prediction and met-ocean data. The application and underlying database will be linked to a decision support system that includes a set of (user-determined) management options. Specific focus will be put on the development of indicators based on Earth observation data for aquaculture management including indicators for harmful algae bloom events. The methods and services developed within AQUA-USERS will be tested by the members of the user board, aquaculture companies and organisations representing different geographic areas and aquacultural production systems.