Venturing into the icy seas around Greenland can be unforgiving and unpredictable. Steffen Andersen, a seasoned skipper preparing his six-man trawler for a fishing trip along the craggy coast, was in the mood to complain. He had recently hired a 16-year-old local to work with him, but he grumbled that the towering Danish-owned factory ships docked along the nearby quayside more often hired immigrants. “Those who use Filipinos, they are the Danes,’’ he said. Greenland is increasingly reliant on migrant labour to keep seafood factories, restaurants and its fishing fleet running — critical for an economy overwhelmingly dependent on fisheries...