https://en.wikipedia.org/wiki/Lobster_War

The Lobster War (also known as the Lobster Operation; Portuguese: Guerra da Lagosta; French: Conflit de la langouste) was a dispute over spiny lobsters that occurred from 1961 to 1963 between Brazil and France. The Brazilian government refused to allow French fishing vessels to catch spiny lobsters 100 miles (160 km) off Brazil’s northeastern coast[5] by arguing that lobsters “crawl along the continental shelf”. The French maintained that “lobsters swim” and so they could be caught by any fishing vessel from any country.[6]