The article reports on the impact of a European Commission regulation aimed at protecting marine ecosystems, which has led to a increase in fish prices, particularly for sea bream, hake, prawns, turbot, and monkfish. The regulation restricts fishing below 400 meters in 87 designated marine polygons, affecting the fishing activities of trawlers and other gear types in areas such as the Bay of Biscay and the Gulf of Cadiz. Initially, the regulation was estimated to affect 10,000 community fishermen, with 2,500 and 500 vessels being Spanish, but clarifications from the European Commission have reduced the impact on the Spanish fleet.