Canadian scientists and fishermen are tracking the northward movement of swordfish into Newfoundland waters where the prized fish is being caught in large numbers on the Grand Banks and Flemish Cap.

What no one knows is if it's the result of a warming ocean or a cyclical — and temporary — event.

"It's still unclear whether this is becoming the new normal due to climate change or if the biomass will eventually shift back again as we think it did historically," said Fisheries and Oceans Canada biol…