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. 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. A population of humpback whales in the South Atlantic has rebounded from the brink of extinction.. The long distance travellers. The table below provides a list of marine mammal species and populations listed as endangered or threatened under the Endangered Species Act (ESA), or designated as depleted under the Marine Mammal Protection Act (MMPA).The MMPA gives special attention to depleted marine mammal species and populations. As of October 2020, the SRKW population totals 74 whales: J Pod=24, K Pod=17, L Pod=33. 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. A good example of this is the North Pacific gray whale, considered healthy in the western North Pacific, but critically endangered in the east. Gray whales undertake one of the world's longest migrations, making a yearly round trip of 15,000-20,000 km. In 1851, hydrographer Matthew Fontaine Maury published a chart of whale population derived from voyage logbooks. According to a new study, published October 16, 2019 in … Researchers believe this new estimate is now close to pre-whaling numbers. • Commercial whaling ended in 1946; gray whales were listed as endangered under the U.S. Their reappearance off of Africa may be due to global warming. The last estimate of the entire gray whale population was 27,000 individuals, Calambokidis said. At least 13 whales were killed during these captures, while 45 whales were delivered to marine parks around the world. A new study finds that the western South Atlantic humpback population has grown to 25,000 whales. 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. A researcher says gray whales used to roam back and forth between the Atlantic and the Pacific oceans. Even within a single population some stocks may be healthy whilst others are not. Within a single whale population, groups are further broken down into 'stocks.' 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