September 16, 2025 — A new peer-reviewed study in Endangered Species Research finds that incorporating maps of copepod aggregations into North Atlantic right whale density models could improve those models’ predictions. The study used data on aggregations of three copepod species collected 2003–2017 from Cape Hatteras, North Carolina, to the Scotian Shelf in Canada. Scientists on the Northeast Fisheries Science Center’s Ecosystem Monitoring Survey collected that data.
Under the Marine Mammal Protection Act and the Endangered Species Act, NOAA Fisheries studies marine mammals, including endangered North Atlantic right whales. We find ways to reduce risks posed to them by human activities and environmental change to recover and protect species.
Modeling Right Whale Distribution Supports Proactive Management
There are approximately 370 North Atlantic right whales remaining, including only about 70 reproductively active females. Right whales feed on copepods, a type of zooplankton. They forage off the Northeast coast of the United States and Canada in the winter and spring when copepods are most abundant there. Their foraging grounds overlap with shipping, fishing, and other human activities. This puts them at risk of entanglement and vessel strikes, the two primary causes of right whale deaths. Changes in climate and oceanographic conditions are shifting the availability of copepods and thus the distribution of whales. Modeling right whale distribution allows for effective management to prevent human-caused whale deaths and injuries. Examples of this include Right Whale Slow Zones and Dynamic Management Areas.
Scientists predict the distribution of these whales using density surface models based on visual data collected from aerial and shipboard surveys, along with acoustic data. For this study, scientists used aerial and shipboard survey data, which included 5,196 individual whale sightings by seven institutions from 2003-2017.