How Many Right Whales Are Left? North Atlantic Population

The latest population estimate

Every fall, the North Atlantic Right Whale Consortium, a partnership of scientists, government agencies, aquariums and conservation groups, announces an updated population estimate. The figure released in October 2025 was 384 whales, with a likely range of about 375 to 394, for the start of 2024. NOAA Fisheries describes this as an increase of roughly 20 whales since 2020 and the third yearly rise in a row.

Counting is possible because right whales can be told apart by the white callosity patterns on their heads, together with scars and other marks. Aerial surveys, research boats and whale watchers photograph thousands of sightings each year, and researchers match them against a catalog of known individuals. A statistical model then estimates how many whales are alive, including those not seen that year. Because some whales go unseen for a while, each estimate looks back a year or more.

How the population has changed

Right whales were protected from commercial whaling in the 1930s, after centuries of hunting had left perhaps fewer than 100 animals in the western North Atlantic. The population grew slowly for decades, then reversed course in the 2010s.

Between about 2010 and 2020, deaths outnumbered births and the population fell by roughly a quarter. Recent estimates show a small recovery, but the species is still far from safe.

The Unusual Mortality Event since 2017

In 2017, 17 right whales were found dead, 12 of them in Canada’s Gulf of St. Lawrence, where many whales had begun feeding only a few years earlier. NOAA declared an Unusual Mortality Event, a formal investigation into a sudden die-off of a marine mammal population.

By 2026 the investigation had counted 176 whales: 43 confirmed deaths, 41 serious injuries that are likely to prove fatal, and 92 whales with lesser injuries or illness. Together they amount to more than 20% of the population. Most cases trace back to entanglement in fishing gear or collisions with vessels. Scientists also estimate that only about one in three right whale deaths is ever detected, because many carcasses sink or drift away unseen.

Females have been hit especially hard, partly because pregnancy and nursing leave them with fewer energy reserves to survive an injury. As a result, the population now contains more males than females.

Why so few calves are born

A healthy female right whale can give birth about every three years. Today the average gap is 7–10 years, according to NOAA Fisheries, and with only about 70 breeding females, even a good year produces just a couple of dozen calves.

Several problems combine. Dragging fishing gear for weeks or months burns energy a female needs for pregnancy. Changes in ocean temperature have altered where their copepod prey gathers, so whales must search harder for food. A 2021 study also found that young right whales are growing up shorter than whales born in the early 1980s, a change linked to entanglement and poor condition, and smaller mothers may produce fewer calves.

The swings can be dramatic: 39 calves were born in 2009, none in 2018, and 23 in 2026. A string of good calving years combined with very few deaths is what recovery would look like.

What is being done to help them?

The United States has required ships 65 ft (19.8 m) and longer to slow to 10 knots (19 km/h) in seasonal management areas along the East Coast since 2008, and it asks all boaters to slow down in temporary “Slow Zones” when whales are detected. A proposal to extend the speed rule to smaller boats was withdrawn in January 2025. Since 2017 and 2018, Canada has used vessel speed limits and fishing closures that respond to whale sightings in the Gulf of St. Lawrence.

Fishing rules aim to reduce the number of vertical buoy lines in the water and to use weaker rope that a whale can break more easily. Fishers and researchers are also testing “ropeless” or on-demand traps, which stay on the seabed until a signal releases the buoy. In late 2022, the US Congress paused new federal whale rules for the American lobster fishery until the end of 2028, a decision that remains controversial.

NOAA’s stock assessments put the number of human-caused deaths this population can sustain at less than one whale per year. That is why every prevented death, especially of a female, matters so much. For the species as a whole, see the North Atlantic right whale profile.

How many other right whales are left?

There are three species of right whale, and their fortunes are very different. Southern right whales were also hunted almost to extinction, but after protection they recovered strongly, to an estimated 13,600 animals in 2009, and they are listed as Least Concern. The North Pacific right whale is listed as Endangered: a population in the western North Pacific numbers perhaps a few hundred, while the eastern North Pacific population may have only about 30 whales left.

The southern right whale’s comeback shows what the North Atlantic species could do if human-caused deaths stopped. The history behind all three species’ decline is told in Why are they called right whales?, and other recovering giants are compared in How many blue whales are left? For more species at risk, see our list of endangered animals.