For years, U.S. authorities and fishermen have complained about illegal fishing for red snapper in the Gulf of Mexico, and now it's clear who is behind the lucrative trade: a Mexican drug cartel.

The U.S. Coast Guard intercepted three lancha crews, seizing 2,200 pounds of illegally caught fish and detaining 19 Mexican fishermen in the Gulf of Mexico.

The Treasury Department issued sanctions against a Mexican drug cartel for their role in illegal red snapper fishing in the Gulf of Mexico.