Scotland protects more than a third of its seas. Why is trawling still allowed?

Bally Philp hauls up his baited traps from the waters off Scotland’s Isle of Skye, checking each one methodically.

Unlike most of Scotland’s coastline, these waters are protected from industrial fishing methods that have devastated seabeds elsewhere. But Philp, who’s fished for more than three decades, has watched conditions deteriorate nearly everywhere else along the coast.