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Marine Mammal Health and Stranding Response Program Results

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2024 Report of Marine Mammal Strandings in the United States

This report details marine mammal stranding rates, trends, and activities in the United States for 2024. In 2024, there were 8,028 confirmed marine mammal strandings in the United States.
February 17, 2026 - Feature Story ,
A man stands with a herding board next to a kennel watching four California sea lions move across a sandy beach heading towards water. California sea lion pups are released at Cabrillo Beach following rehabilitation at the Marine Mammal Care Center in San Pedro, California. Credit: Marine Mammal Care Center Los Angeles.

NOAA Announces Confirmed U.S. Large Whale Entanglement Numbers for 2024

There were 95 large whale entanglement cases documented in 2024—an increase from 2023 and higher than the historical average.
September 18, 2025 - Feature Story ,
A trained and authorized responder stands on the bow of a boat and uses a specialized knife on a very long pole to attempt to remove an entanglement wrapped around a humpback whale’s body Credit: NOAA/Maria Harvey

2022 and 2023 Combined Report of Marine Mammal Strandings in the United States

This report details marine mammal stranding rates, trends, and activities in the United States for both 2022 and 2023. In 2022, there were 6,061 confirmed marine mammal strandings; in 2023, there were 6,648.
July 31, 2025 - Feature Story ,
A minke whale carcass lies on a rocky beach. There are several lines to secure it in place while responders take measurements and samples. A complete necropsy of a minke whale on Blakely Island, Washington. The necropsy revealed injuries—including severe bruising and broken ribs and vertebrae—consistent with a vessel strike. Credit: The Whale Museum

NOAA Announces Confirmed Large Whale Entanglement Numbers for 2023

There were 64 large whale entanglement cases documented in 2023—a decrease from 2022 and below the historical average.
July 22, 2025 - Feature Story ,
Trained and authorized responders use a grapple to grab the entanglement trailing behind a  North Atlantic right whale (#4545). Credit: Center for Coastal Studies, taken under NOAA Permit # 24359 Trained and authorized responders use a grapple to grab the entanglement trailing behind a North Atlantic right whale (#4545). Credit: Center for Coastal Studies, taken under NOAA Permit # 24359

$4 Million Awarded for Marine Mammal Rescue Efforts through Prescott Grant Program

NOAA Fisheries recommended awarding 37 grants, totaling more than $4 million, through the John H. Prescott Marine Mammal Rescue and Assistance Grant Program to our partners in 16 states.
September 30, 2024 - Feature Story ,
Humpback whale carcass lying on beach with two people measuring the pectoral flipper Authorized responders from the Seacoast Science Center take measurements of a dead humpback whale that stranded in Marblehead, Massachusetts. Credit: Seacoast Science Center.

National Marine Mammal Stranding Response Network

The U.S. Marine Mammal Stranding Response Network responds to live stranded, sick, injured, out of habitat, or entangled marine mammals, and investigates dead stranded marine mammals.

2020 and 2021 Combined Report of Marine Mammal Strandings in the United States

This report details marine mammal stranding rates, trends, and activities in the United States for both 2020 and 2021. In 2020, there were 5,400 confirmed marine mammal strandings; in 2021, there were 5,524.
April 03, 2024 - Feature Story ,
Two stranding responders carry a stranded harbor porpoise away from some rocks A harbor porpoise is retrieved from the rocks at Odiorne Point State Park, New Hampshire. Credit: Seacoast Science Center

2020 and 2021 Combined Report of Marine Mammal Strandings in the United States

NOAA Fisheries released the 2020 and 2021 Combined Report of Marine Mammal Strandings in the United States. Responding to stranding events and collecting data on stranded animals helps NOAA Fisheries monitor health and environmental trends that may impact humans.
April 03, 2024 - Document ,

Closure of 2019–2023 Eastern North Pacific Gray Whale Unusual Mortality Event

The Unusual Mortality Event involving stranded eastern North Pacific gray whales has ended.
March 14, 2024 - Feature Story ,
People on a beach performing a necropsy on a stranded gray whale