The Aqua-Lit project aims to provide a sustainable toolbox of innovative ideas and methodologies to (a) prevent marine littering from aquaculture activities; (b) have better monitoring schemes in place, and (c) remove and recycle litter from the aquaculture facilities both before litter enters the sea and for litter already existing at sea. In line with the new EU Strategy for Plastics in a Circular Economy and considering that aquaculture is the fastest growing food-producing sector, with an expansion rate of 8% per year, AQUA-LIT considers crucial to: 1. Understand better how aquaculture activities (separate from fishing activities) are littering the Ocean through monitoring and quantification frameworks; 2. Provide littering preventive measures that help reduce the input of litter from the aquaculture industry and that can be applied as the sector keeps expanding; 3. Provide mechanisms that help reduce the existing marine debris coming from aquaculture activities, including the testing of best available techniques for aquaculture installations; 4. Provide solutions for recycling the collected plastic waste, aiming towards a more circular economy, and 5. Examine what policies need to be adapted or put in place to underpin these practical actions.