April 1, 2020 — A new series of interactive maps graphically portray long-term shifts in fish populations off the East Coast, as changing ocean temperatures push species like black sea bass northward.
Published through the online on the Mid-Atlantic Ocean Data Portal, the maps chart major change since the 1970s that have affected commercially and recreationally important finfish species living along the East Coast.
Using the free public-access portal at portal.midatlanticocean.org users can automatically animate or toggle through hundreds of maps representing fish distributions during the spring or fall seasons from the 1970s through 2019. The portal maintains 5,000 map layers that can superimpose data for commercial fishing hot spots, marine life habitats, zones being examined for offshore wind development and other ocean activities.
Many of the maps confirm trends seen by fishermen and biologists of species moving to waters further north and further offshore since the 1970s. Black sea bass have become a well-known example; once straying into southern New England waters, black sea bass have over the decades moved past Cape Cod to become established in the Gulf of Maine.
“Our analysis and the maps make no assumptions as to the factors causing these shifts,” said Chris Bruce, Global Information Systems manager at The Nature Conservancy in Virginia and a member of the portal technical team, in a statement. “However, there is no shortage of scientific research to refer to on how factors like climate change and increasing water temperatures are impacting marine habitats.”