Illegal fishing exposed? A simple light on ships could stop it.

Mamadou Sarr remembers when a fisherman in Dakar only had to sail his small wooden boat one kilometer from shore to find plenty of sardines and cuttlefish. For generations, Senegal’s coastal waters were the foundation of a trade passed from father to son. Today, that rich fishing ground is nearly empty. The cause is industrial overfishing. Large foreign ships often fish illegally, taking massive amounts of fish from waters that local fishermen rely on. Now, scientists have a new tool to fight this problem: light. They propose requiring all fishing vessels to carry a bright, always-on light. This light would make ships easy to spot from satellites. If a ship turns off its light, it becomes a clear sign of illegal activity. The idea is simple. Most illegal fishing happens at night. Without a light, a ship is hidden. With a light, authorities can track every vessel in real time. This system would not require new laws, only better enforcement of existing rules. For Senegal’s fishermen, this change could mean a return to the old days. “If the big ships cannot hide,” Sarr says, “our children might again fish close to shore.”