The Climate.gov article In search of cooler waters, marine species are shifting northward or diving deeper by John Dos Passos Coggin (4/3/2020) explains:
The graphs show the annual change in latitude and depth of 140 marine species along the northeastern U.S. coast and in the eastern Bering Sea. Changes in geographic distribution have been aggregated across all 140 species. In waters off the Northeast, fish and shellfish are moving northward at a significant rate; in the eastern Bering Sea, they are still shifting northward but at a lesser rate. Likewise, marine species in both regions are moving to deeper waters, but the rate of change in depth is especially high along the northeastern coast.