Government authorities and shipping industry insiders are increasingly concerned that maritime piracy will rise globally as huge, commercial fishing firms—especially the ones that operate illegally—drive fishermen from poor countries out of business.

A trawler moored in Dakar on Jan. 5, 2014.

Local fishermen who have plied their trade for generations in Latin America, Africa, Asia and even Northern Europe increasingly find their livelihood threatened by commercial fishing operations whose scale and more advanced vessels are just too much to compete against.