Baltic Sea Seafloor Scars Reveal True Bottom Trawling Impact, Studies Find

Two new studies from the Leibniz Institute for Baltic Sea Research Warnemünde (IOW) show that marks left on the seafloor provide a far more accurate picture of bottom trawling impact than vessel tracking data alone. Using high-resolution echo sounder measurements and artificial intelligence, researchers analyzed furrows in the Baltic Sea seabed to assess disturbance and recovery. They found that trawling marks persist and reveal damage that had previously gone unrecorded, with the seafloor showing surprisingly rapid changes in condition. The studies, published in Ecological Informatics and Anthropocene, also uncovered strong evidence of fishing violations inside a marine protected area. The findings matter because bottom trawling is a widespread fishing method that can disturb habitats, but its true footprint has been underestimated. By mapping actual seafloor scars, scientists can better quantify ecological damage and monitor compliance with conservation rules. The research suggests that regulators may need to rely on physical evidence rather than ship positions to enforce protected zones. The Baltic Sea, already stressed by pollution and climate change, faces added pressure from unmonitored trawling. The IOW team's AI-driven approach could be applied to other seas to improve fisheries management. As marine protection efforts expand, such tools will be essential to verify whether restrictions are working on the ground—or on the seabed.