The Ocean Cleanup has revealed that 75% to 86% of plastic debris in the Great Pacific Garbage Patch (GPGP) originates from fishing activities at sea. Plastic emissions from rivers remain the main source of plastic pollution from a global ocean perspective. But plastic lost at sea has a higher chance of accumulating offshore than plastic emitted from rivers, leading to high concentrations of fishing-related debris in the GPGP. These findings confirm that oceanic garbage patches cannot be cleaned solely through river interception and highlight the potentially vital role of fishing and aquaculture in ridding the world’s oceans of plastic.