Please select your home edition
Cyclops Marine 2020 - LEADERBOARD

Twentymile river whale likely one of twelve dead gray whales so far this year in Alaska

by NOAA Fisheries 27 Jun 15:00 UTC
A stranded gray whale found in upper Cook Inlet, near the mouth of the Theodore River. © AVPS / Natalie Rouse

The gray whale that was first reported in Twentymile River near Girdwood, Alaska on Memorial Day has likely died. It had lingered in the river for more than a week before swimming back into Turnagain Arm, but it never made it down Cook Inlet back to the Gulf of Alaska.

NOAA Fisheries received a report on Friday, June 12 that a large dead whale was sighted from the air. It was spotted at the mouth of the Theodore River, near the Susitna River.

"We hoped for the best, but expected the worst given the poor condition of the gray whale when it left the Twentymile River," said NOAA Fisheries Biologist Barbara Mahoney. "After considering the challenges of Turnagain Arm's currents and tides, it is unlikely that two gray whales would strand in upper Cook Inlet in the same time period. We have determined that the dead gray whale by Susitna River is likely the same one from Twentymile River."

An examination of the photographs determined the gray whale was male.

Gray Whale in Twentymile River

A fisherman first reported the gray whale on Memorial Day. Twentymile River is popular for fishing, including opportunities in May to catch eulachon, a small, oily fish also referred to as hooligan or candlefish.

The fisherman told NOAA Fisheries a whale was in the Twentymile River, about a mile upstream of the Seward Highway Bridge. He shared a video of the whale with NOAA, and agency staff confirmed it was a gray whale.

That evening, NOAA partners took a boat upriver to monitor and photograph the whale. They found the 27-30 foot long animal swimming in a 200 yard loop along the cut bank, where the water was deepest. A shallow area downstream of the whale and decreasing tides prevented it from swimming downriver.

NOAA continued to monitor the whale's behavior and condition. It looked like the whale's best opportunity to swim downriver and into Turnagain Arm would be on Wednesday, June 3. The high tide that day was expected to increase to more than 30 feet.

On the morning tide of June 2, the whale moved downriver about 300 yards to the mouth of Twentymile River with the higher tide. It found a deep pool of water. NOAA Fisheries collaborated with the State of Alaska Unmanned Aerial System Program to collect aerial video of the whale from a drone. The drone video allowed agency biologists to assess the behavior and body condition of the whale and identify important river features downriver of the whale.

Later that day, Andy Morrison, with Alaska Backcountry Access, boated to an area near where the whale was swimming to allow UAS Drone Operator Ryan Marlow access.

Marlow used a drone to film the whale. He also used a device known as a "snotbot" to collect breaths from the whale. He collected eight samples that will be analyzed to better understand the whale's health.

The following morning, June 3, NOAA Fisheries heard that the gray whale swam under the bridges, close to Turnagain Arm. However, he turned back upriver and became stuck in shallow water next to the Seward Highway Bridge. With the rising tide that evening, the whale was able to free itself, turn around to face downriver, and swim into Turnagain Arm.

Based on the photos and video collected of the whale, veterinarians determined the whale was in fair to poor condition.

NOAA received another report that the gray whale stranded in Turnagain Arm during low tide at Ingram Creek. Many volunteers looked for the whale along the Seward Highway over the next few days. An aerial survey of Turnagain Arm on June 5 found no sign of the whale.

Gray whale unusual mortality event continues

The fate of the gray whale from the Twentymile River event was unknown until the June 12. That was when we received a report of a large dead whale at the mouth of the Theodore River. It was first seen and photographed on June 11.

This gray whale is among 12 dead gray whales confirmed in Alaska this year. The Gray Whale Unusual Mortality Event, declared May 2019, continues along the west coast of North America, from Mexico through Alaska.

"Although the number of gray whale strandings along the west coast is lower this year relative to 2019, the number of dead gray whales in Alaska is slightly higher than the seven whales confirmed last year at this time," said NOAA Fisheries veterinarian Kate Savage. "Our total in Alaska for 2019 was 48 confirmed dead gray whales, and we are collaborating with coastal communities to track stranded gray whales this year. We hope not to reach or exceed that number in 2020."

Alaska 2020 Gray Whale Strandings

April 22, Port Heiden - beached male about 1/2 mile up the Meshik River (Bristol Bay).
May 20, Yakutat - gray whale bones and baleen found on the beach.
May 20, Cordova - gray whale observed floating in Orca Channel, west of Point Whitehead.
May 28, Anchor Point - gray whale stranding (Cook Inlet).
May 26, Nushagak Peninsula - beached male (Bristol Bay).
May 30, Egg Island - gray whale floating (Cordova).
June 2, Tugidak Island - gray whale with advanced decomposition (Kodiak).
June 3, Twentymile River - gray whale live stranding. June 11, Theodore River - determined to be the same Cook Inlet gray whale.
June 15, Sitkalidak Island - gray whale with moderate decomposition (Kodiak).
June 7, Pilot Point - gray whale with advanced decomposition (Bristol Bay).
June 17, Ugashik - adult male, 39 feet long (Bristol Bay).
June 17, Hooper Bay - gray whale stranding (Bering Sea).

We want to remind the public to not approach within 100 yards of marine mammals. Drones should be flown at least 1,000 feet from marine mammals. If you see an injured, entangled, or dead marine mammal, immediately call NOAA Fisheries Alaska Statewide Marine Mammal Stranding Network hotline at 877-925-7773.

Related Articles

North Atlantic right whales classification updated
There are about 400 individuals remaining, and likely fewer than 100 breeding females The International Union for Conservation of Nature recently changed its Red List Category for North Atlantic right whales from Endangered to Critically Endangered. Posted today at 10:53 am
What is nearshore habitat?
Restoration focuses on valuable shoreline habitat where juvenile fish grow There is an especially valuable environment in Puget Sound made up of the beaches, bluffs, inlets, and river deltas: the nearshore. Posted on 28 Jun
Returning rescued sea turtles to the wild
Learn about the operations that go into rescuing, rehabilitating and releasing protected sea turtles We work with organizations along the Atlantic coast to help rescue and rehabilitate protected animals such as sea turtles. A successful rescue takes months of work and coordination between many partners. Posted on 27 Jun
Celebrating sea turtle conservation
Conserving and protecting sea turtles is a part of our core mission at NOAA Fisheries NOAA Fisheries is committed to the protection, conservation, and recovery of sea turtles. We conduct research to inform conservation management actions and we work closely with our partners to advance conservation and recovery of these amazing animals. Posted on 22 Jun
Large whale entanglements report confirmed in US
More than 100 large whale entanglements were confirmed nationally in 2018 Many large whale populations are increasing in the United States, but entanglements in fishing gear or marine debris are a growing threat to the continued welfare and recovery of these species. Posted on 20 Jun
Autonomous vehicles help scientists estimate fish
An innovative scientific approach to survey Alaska pollock this year Scientists are capitalizing on existing technological capabilities and partnerships to collect fisheries data. This will help fill the information gap resulting from the cancellation of FY20 ship-based surveys due to the COVID-19 pandemic. Posted on 5 Jun
Newly weaned seal pup needs community help
NOAA and partners are requesting beach goers and ocean users keep their distance A recently weaned female Hawaiian monk seal pup has been resting along the shoreline and swimming in the waters along O'ahu's Kaiwi Coastline. She has appeared near some busy beach areas and hauled out in areas with a lot of vehicle activity on the beach. Posted on 30 May
Researchers probe orca poop for microplastics
What are microplastics and why are researchers looking for them in whale feces? You might worry about your toddler chewing on a plastic toy with toxic chemicals. Some orca researchers are beginning to worry about whales ingesting a gut full of microplastics, and what that might mean for their health. Posted on 29 May
Busy Atlantic hurricane season is expected
Multiple climate factors indicate above-normal activity is most likely An above-normal 2020 Atlantic hurricane season is expected, according to forecasters with NOAA's Climate Prediction Center, a division of the National Weather Service. Posted on 24 May
Team frees entangled humpback whale
Multiple sets of fishing gear were so heavy, they 'anchored the whale in place' A trained response team on Monday freed a humpback whale in Monterey Bay. It had become so severely entangled and weighed down by commercial dungeness crab fishing gear that it could not move. Posted on 23 May
GJW Direct 2020 FOOTERGrapefruit Graphics 2019 - FooterVaikobi 2019AUG - Footer 3