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Humpback whale playing with kelp

Why do humpback whales wear seaweed wigs?

Alison Wood Ali is WDC's education projects coordinator. She is the editor of Splash! and KIDZONE,...
Japanese whaling ship

WDC in Japan – Part 5: The meaning of whaling

Katrin Matthes Katrin is WDC's communications and campaigns officer for policy & communication in Germany...
Risso's dolphins off the Isle of Lewis, Scotland

Unravelling the mysteries of Risso’s dolphins – WDC in action

Nicola Hodgins Nicola is WDC's cetacean science coordinator. She leads our long-term Risso's dolphin research...
Save the whale save the world on a tv in a meeting room.

Saving whales in boardrooms and on boats

Abbie Cheesman Abbie is WDC's head of strategic partnerships. She works with leading businesses to...
Outcomes of COP28

Outcomes for whales and dolphins from COP28

Ed Goodall Ed is WDC's head of intergovernmental engagement. He meets with world leaders to...
Taiji's cove with boats rounding up dolphins to be slaughtered or sold to aquraiums

WDC in Japan – Part 4: A journey to Taiji’s killing cove

Katrin Matthes Katrin is WDC's communications and campaigns officer for policy & communication in Germany...
Blue whale at surface

Creating a safe haven for whales and dolphins in the Southern Ocean

Emma Eastcott Emma is WDC's head of safe seas. She helps ensure whales and dolphins...
We're at COP28 to Save the Whale, Save the World.

We’re at COP28 to save the whale, save the world

Ed Goodall Ed is WDC's head of intergovernmental engagement. He meets with world leaders to...
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Port River dolphins

New report reveals 100,000 dolphins and small whales hunted every year

When you hear the words ‘dolphin hunts’ it’s likely that you think of Japan or...

Minke whale hunts stop in Iceland

Iceland’s commercial hunt of minke whales has ended for this year. The common minke whale is the...

Australian Government to block Japanese whaling proposal

Japanese Government officials have reportedly confirmed that they will propose the resumption of commercial whaling...

Did Icelandic whalers really kill a blue whale?

*Warning - this blog contains an image that you may find upsetting* They say a...

Icelandic whalers breach international law and kill iconic, protected whale by mistake

Icelandic whalers out hunting fin whales for the first time in three years appear to...

Pregnant whales once again a target for Japanese whalers

Figures from Japan's whaling expedition to Antarctica during the 2017/18 austral summer have revealed that...

Doubts remain after Icelandic Marine Institute claims slaughtered whale was a hybrid not a blue

Experts remain sceptical of initial test results issued by the Icelandic Marine Institute, which indicate...

Japan set to resume commercial whaling

Reports from Japan suggest that the government they will formally propose plans to resume commercial...

End the whale hunts! Icelandic fin whaler isolated as public mood shifts

Here’s a sight I hoped never again to witness. A boat being scrubbed and repainted...

Norway increases whaling quota despite declining demand

Norway's government has announced an increase in the number of minke whales that can be...

Norway's whaling season begins

April 1st saw the start of the whaling season in Norway. Despite a widely-accepted international moratorium...

SOS alert for whales off Norway!

I have to admit to bitter disappointment when I arrived in Tromsø, northern Norway, a...

Another risky summer for West Coast humpbacks

For the third year in a row, the coast of California has been treated to a “whale spectacular” of humpback whales coming very close to shore, even into San Francisco Bay, giving tourists and residents, both casual onlookers and avid whale watchers, an amazing look into the lives of these magnificent beings.  The whales are here to eat, following the abundance of food – primarily anchovies – found in the cold, nutrient-rich waters of the south-flowing “California Current” that creates the incredible diversity of marine life off the west coast.  But with this proximity also comes vulnerability, as reports of entangled humpback whales continue to increase, and people eager to get an even closer look put the whales, and themselves, in danger.

The California Coast has a long history of attracting whales and other diverse marine life to its shores while they forage on the buffet created by strong upwelling (when cold, nutrient-rich water from the deep ocean is brought to the surface) just off the coast.  But in recent years, warming ocean waters and the notorious “Blob” of 2015 has caused fish to move closer to shore, and the coast has become a narrow cold-water refuge.  Following their food, the whales also move into this narrow area close to the coast, already busy with human activities like shipping, recreational boating, and fishing.

This image shows the exceptionally warm waters seen in the Pacific Ocean in 2015, nicknamed “The Blob.”  Note the narrow band of colder water close to shore (image from the American Geophysical Union).

Entanglements on the rise

The past three years have been record-setting years for reports of entangled humpback whales off the west coast, and 2017 is on track to break those records yet again.  In the last two weeks of July alone, three whales were reported and confirmed to be tangled in fishing gear.  Humpbacks, gray whales, and blue whales have all been reported entangled off the California coast.  Entanglements are one of the leading modern-day causes of death for whales large and small, and even if they are freed by expert, federally-designated disentanglement teams, the resulting injury or subsequent infection may still take the life of the whale.

On the California coast, humpbacks are entangled the most often, usually during the summer, when their feeding season overlaps with fishing seasons.  Researchers estimate that for every one entangled whale that is seen and reported, there are probably ten more that are not seen.  As a result, the 71 whales reported entangled in 2016 may mean there were closer to 700 whales entangled on the west coast.  These incidents can range from loose wraps of rope that the whales eventually lose on their own to very extensive entanglements that can make it difficult for whales to swim, feed, nurse, or even result in anchoring a whale in place, leaving them to starve or drown. 


This table, from the National Marine Fisheries Service 2016 West Coast Entanglement Summary, compares entanglements reported in 2015 with 2016 – reported humpback entanglements significantly increased (NMFS 2017).

Causing even more alarm, two of the humpback populations that come to the California coast in the summer are on the Endangered Species List, further impeding the recovery of these vulnerable populations.  Although the State of California, the National Marine Fisheries Service (NMFS), and local fishermen and NGOs have developed a working group to address the growing number of entanglements, some feel they have not taken action quickly enough, and are pursuing legal action to protect endangered humpback populations and other marine life.

Ship strikes

In this nearshore habitat, the whales are also at risk of run-ins with boats – a combination of busy shipping lanes and summertime recreational boats out to enjoy a day on the water.  Some of those boaters, unaware of the guidelines protecting whales and other marine mammals from harassment, or perhaps ignoring them in the effort to grab that next viral video, go for the close approach, putting the whales, and themselves, in danger.  The whales, often distracted and preoccupied with the important business of eating do not always get out of the way of oncoming vessels.  Whales can be hit by the hull of a vessel or run over and struck by the propellers. Like entanglements, vessel strikes are also significantly underreported.  New research on ship strikes off California indicates that mortality is probably far higher than what is currently estimated, and that risk of a ship strike is highest in shipping lanes off the busy ports of San Francisco and Long Beach (Rockwood et al. 2017).

This year, like last year, humpbacks are traveling all the way under the Golden Gate Bridge and into San Francisco Bay to feed.  Photo ID efforts by researchers in the area indicate that some of these are the same whales, coming back to feed on the rich supply of food they know is here.  These repeat visitors show that these whales are remembering that the San Francisco Bay is a good place to find food, and we could see numbers continue to increase next year if oceans conditions stay the same.  However, coming so close to shore, and into the Bay, puts whales and boats into close proximity.  There have been several incidents this summer, including a kiteboarder taken by surprise, a whale having to make a gymnastic dodge to avoid a sailboat, and a direct hit on a surfacing humpback. 

These interactions with human activities could have a significant impact on the endangered humpback populations that spend their summers off the California coast.  It is important that people understand that whales can be unpredictable, and respect the regulations for viewing whales that keep both whales and people safe from injury. 

WDC is working to develop criteria for responsible and sustainable whale and dolphin watching.  Our US programs for commercial whale and dolphin watching, Whale SENSE and Dolphin SMART, combines the extraordinary experience of watching whales in the wild with important data collection, community involvement, and public education.  In addition, we work to educate recreational boaters about the guidelines for approaching marine life and how to be respectful around whales and dolphins, and have recently published a report on responsible whale watching worldwide.

You can help us continue to make sure every whale and dolphin is safe and free!  Adopt a humpback with WDC, subscribe to our blogs and action alerts, support while you shop, or make a donation.