Fishing Boats ‘Going Dark’ At Sea Raise Suspicion Of Illegal Activity

To fight illegal fishing, the world is trying to track fishing boats at sea. But some boats want to stay in the dark.

A new report raises concerns that when fishing vessels “go dark” by switching off electronic tracking devices, in many cases they are doing so to mask the taking of illegal catches in protected marine parks and restricted national waters.

In the report released Monday by Oceana, an international conservation group, authors Lacey Malarky and Beth Lowell document incidents of fishing vessels that disappear from computer screens as they shut off collision-avoidance beacons near restricted areas, only to have them reappear days or weeks later back in legal fishing grounds.

“This practice of vessels going dark is really widespread on a global scale,” Malarky tells NPR.

Malarky and Lowell used Global Fishing Watch, which aggregates automatic identification system, or AIS, signals to give an unprecedented view of global fishing activity. AIS signals can be viewed by the public through such websites as

Yet another system, known as Vessel Management System, or VMS, is not available to the public but is used by countries to monitor their fishing fleets. However, “some countries can’t afford it — developing countries like those in West Africa,” Malarky says.

Photo: Osman Rana/Unsplash

To view the Creative Commons license for the image, click here.

Sign up today and take the pledge to help save our world's oceans by visiting us at: