November 20, 2018 — On October 14, the crew of a US National Oceanic and Atmospheric Administration (NOAA) ship called the Henry B. Bigelow reported a whale carcass floating about 100 miles east of Nantucket, a small island off the coast of Cape Cod, Massachusetts. The carcass was later identified as a sub-adult North Atlantic right whale.

After reviewing data collected from the deceased whale, scientists determined the probable cause of death was “severe acute entanglement,” according to NOAA. “The whale had multiple wounds indicative of a wrapping line entanglement, including pronounced ligature impressions with related deep concave defects indicating severe constricting abrasions. Entanglement wounds were strongly suggestive of numerous transverse body wraps involving the thorax (chest) and flippers.”

This is the third North Atlantic right whale known to have died this year — one died in January and another in August — and all three appear to have been the victims of entanglement in fishing gear left behind by humans or collisions with ships. The North Atlantic right whale is listed as Endangered on the IUCN Red List.

New research finds that these deaths caused by human activities are not just impacting individuals and their immediate family units, but actually impeding population growth among North Atlantic right whales altogether.

Like many other baleen whale species, North Atlantic right whales were nearly exterminated by historical commercial whaling. Their numbers gradually increased up until around 2010, when they started to decline once again. 2018 has actually been far less deadly for the whales than 2017, when NOAA confirmed 17 North Atlantic right whale deaths, which is equivalent to about 4 percent of their total estimated population of 450 individuals. It is believed that there are only about 100 females of breeding age left in the population.

There are three species of right whales in the world, the North Atlantic right whale (Eubalaena glacialis), the North Pacific right whale (Eubalaena japonica), and the southern right whale (Eubalaena australis). Peter Corkeron, head of a whale research initiative at NOAA’s National Marine Fisheries Service, led an international team that studied the western North Atlantic population and three populations of southern right whales, which are listed as a species of Least Concern on the IUCN Red List, in order to determine whether or not the slow growth rate of North Atlantic right whales is attributable to humans.

Read the full story at Mongabay