Research has found that climate change is forcing fish to head north in search of cooler seas.
A University of British Columbia scientist says fish species from southern oceans have been gradually moving north for four decades already.
In a paper published in the journal Nature, William Cheung says that's because climate change is gradually warming the oceans and fish are seeking more comfortable waters.
He says fishers off the coast of New England are already starting to see species associated with warmer seas.
Cheung says that could spell trouble for tropical fisheries as the catch slowly drifts north.