In 1851, hydrographer Matthew Fontaine Maury published a chart of whale population derived from voyage logbooks. Within a single whale population, groups are further broken down into 'stocks.' A good example of this is the North Pacific gray whale, considered healthy in the western North Pacific, but critically endangered in the east. The size of all three Southern Resident pods was reduced in number from 1965-75 as a result of whale captures for marine park exhibition. Researchers believe this new estimate is now close to pre-whaling numbers. The last estimate of the entire gray whale population was 27,000 individuals, Calambokidis said. Gray whales undertake one of the world's longest migrations, making a yearly round trip of 15,000-20,000 km. A new study finds that the western South Atlantic humpback population has grown to 25,000 whales. At least 13 whales were killed during these captures, while 45 whales were delivered to marine parks around the world. Although the remaining populations of gray whale were thought to be relatively isolated from each other, recent data shows that at least some of the whales in the western population actually migrate all the way round the rim of the Pacific and down to Mexico. By that time, the North Atlantic Ocean was already stripped of sperm and right whales. The eastern North Pacific gray whale (also known as the California Gray Whale) population has been hunted extensively by both commercial and aboriginal whalers, with intense commercial takes in the late 19th and early 20th centuries greatly reducing the population from an estimated pre-exploitation size of between 15,000 and 24,000 animals. A population of humpback whales in the South Atlantic has rebounded from the brink of extinction.. • Commercial whaling ended in 1946; gray whales were listed as endangered under the U.S. According to a new study, published October 16, 2019 in … Even within a single population some stocks may be healthy whilst others are not. Census Project Director/Coordinator: Alisa Schulman-Janiger Email: [email protected] For daily sighting details, please visit: www.acs-la.org More humpback and blue whale sightings highlighted our 2018/2019 ACS/LA Gray Whale Census and Behavior Project, but many skinny grays and low calf counts were very concerning. Eastern Pacific Gray Whale: The Recovery Success Story • The E Pacific Gray Whale population was greatly reduced by whaling (~15,500 whales were killed between 1846 and 1900) from a pre-exploitation size estimated to be between 15,000 and 24,000 animals. Their reappearance off of Africa may be due to global warming. 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