An 18-year old male southern resident killer whale, J34, is stranded near Sechelt in 2016. A postmortem examination suggests he died from trauma consistent with a vessel strike. (Photo supplied by Paul Cottrell, Fisheries and Oceans Canada)

An 18-year old male southern resident killer whale, J34, is stranded near Sechelt in 2016. A postmortem examination suggests he died from trauma consistent with a vessel strike. (Photo supplied by Paul Cottrell, Fisheries and Oceans Canada)

“We can do better” — humans the leading cause of orca deaths: study

B.C. research reveals multitude of human and environmental threats affecting killer whales

Human interactions are the leading cause of untimely death among B.C.’s killer whales, a new study suggests.

A team of marine mammal and orca specialists analyzed pathology reports of 52 killer whales stranded in Hawaii and the northeast Pacific, including the southern resident killer whales regularly spotted off the B.C. coast, finding the animals face a variety of threats, but the reemerging theme was human-caused in every age class.

“In British Columbia, we lost nine southern resident killer whales — two adults, two subadults and one calf died from trauma. One was a confirmed propeller strike, with one adult and two subadults from suspected ship strikes,” said lead author Stephen Raverty, a veterinarian pathologist with the BC Ministry of Agriculture and adjunct professor at the University of British Columbia stated in a press release. “One of these iconic species passed away from an infection secondary to satellite tagging. Another death was due to natural causes and the other two undetermined. Half of the southern killer whale deaths identified in this study were caused by human interactions.”

READ MORE: What’s going on with marine mammals in Vancouver waterways?

The study was based on orca deaths between 2004 and 2013, led by the British Columbia Ministry of Agriculture, and coordinated through the SeaDoc Society, a Washington-based program of the University of California. Raverty and coauthor Dr John Ford are adjunct professions at UBC’s Institute of Oceans and Fisheries and Department of Zoology, respectively.

The report may offer one of the most comprehensive looks yet at the multitude of human and environmental threats affecting killer whales, and help inform strategies to better protect them. While human interactions play a key role, the researchers cautioned the findings indicate an understanding of each threat is critical for conserving orca populations.

“The results from systematic necropsies of dead killer whales in this review is unique and will establish critical baseline information to assess future mitigation efforts,” Raverty said. “This work contributes to a better understanding of the impacts that ongoing human activities and environmental events have on killer whales.”

Overall, of the 52 whales studied, the cause of death was determined for 42 per cent. Other causes include sepsis following a halibut hook injury, starvation from a congenital facial deformity, infectious disease and nutritional deficiencies.

“Nobody likes to think we’re directly harming animals,” said co-author and SeaDoc Society Director Joe Gaydos. “But it’s important to realize that we’re not just indirectly hurting them from things like lack of salmon, vessel disturbance or legacy toxins. It’s also vessel strikes and fish hooks. That humans are directly killing killer whales across all age classes is significant; it says we can do a better job.”

READ MORE: Southern resident killer whale died of blunt trauma, likely from ship

READ MORE: Newborn southern resident killer whale spotted in B.C. waters



quinn.bender@blackpress.ca

ConservationKiller WhalesScience

Just Posted

Terry Keogh, an RDN Transit driver, used his paramedic skills the morning of Jan. 22 after coming across an unconscious woman along his route in downtown Nanaimo. (RDN Transit photo)
RDN Transit driver stops his bus and helps get overdosing woman breathing again

Former EMT from Ireland performed CPR on a woman in downtown Nanaimo on Friday

Jimmy Fallon joked that a woman’s 4.5-star review of a Langford jail is “the most Canadian thing you could do” in The Tonight Show Jan. 21. (Screenshot/YouTube)
VIDEO: Jimmy Fallon jokes Canadian jails are basically hotels following woman’s 4.5-star review

Woman gave handwritten card to police following stay in Langford cells

Black Press file photo
Investigation at remote burned-out Vancouver Island cabin reveals human remains

Identity of victim not released, believed to be the owner of an SUV vehicle found parked nearby

The District of Saanich’s communications team decided to take part in a viral trend on Thursday and photoshopped U.S. Senator Bernie Sanders into a staff meeting photo. (District of Saanich/Twitter)
Bernie Sanders makes guest appearance at Saanich staff meeting

Sidney firefighters jump on viral trend of photoshopped U.S. senator

Dog owners, from left, Marlyn Briggs with Nayla, Marjory Sutherland with Effie and Mick, and Christina Godbolt with Conon walk their pets frequently at the Chemainus Ball Park but are growing increasingly concerned about drugs being found discarded in the area. (Photo by Don Bodger)
Puppy rushed to emergency 3 times after ingesting drugs in Vancouver Island public spaces

Dog owners walking in Chemainus parks urged to take caution

Toronto Public Health nurse Lalaine Agarin sets up for mass vaccination clinic in Toronto, Jan. 17, 2021. B.C. is set to to begin its large-scale immunization program for the general public starting in April. THE CANADIAN PRESS/Frank Gunn
B.C.’s COVID-19 mass vaccinations expected to start in April

Clinics to immunize four million people by September

Angela Waldick is the new team photographer for the Nanaimo NightOwls. (Nanaimo NightOwls photo)
Half-blind photographer will help new Island baseball team look picture-perfect

Nanaimo NightOwls say legally blind team photographer is making history

The Boys and Girls Club of Greater Victoria says sale of the planned subdivision will increase the club’s ability to provide services and support. (Courtesy of Association for the Protection of Rural Metchosin)
Victoria Boys and Girls Club says youth would benefit from Metchosin land sale

Club says sale will guarantee supports and programs at time when demand high

Chief Public Health Officer Theresa Tam speaks during a daily briefing in Ottawa. (THE CANADIAN PRESS/Adrian Wyld)
31 cases of COVID-19 variants detected in Canada: Health officials

Dr. Theresa Tam made announces 13 more variant COVID-19 cases in Canada

An Atlantic salmon is seen during a Department of Fisheries and Oceans fish health audit at the Okisollo fish farm near Campbell River, B.C. in 2018. The First Nations Leadership Council says an attempt by industry to overturn the phasing out of salmon farms in the Discovery Islands in contrary to their inherent Title and Rights. (THE CANADIAN PRESS /Jonathan Hayward photo)
First Nations Leadership Council denounces attempt to overturn salmon farm ban

B.C.’s producers filed for a judicial review of the Discovery Islands decision Jan. 18

Daily COVID-19 cases reported to each B.C. health region, to Jan. 20, 2021. Island Health in blue, Northern Health green, Interior Health orange, Vancouver Coastal in red and Fraser Health in purple. (B.C. Centre for Disease Control)
B.C.’s COVID-19 infection rate stays stable with 508 cases Friday

Vaccine delivered to more than 110,000 high-risk people

A fire broke out near the Willow Point Bottle Depot early on Jan. 22. Photo courtesy Ashley Laycock
Two injured in early-morning fire in Campbell River

Sailboat fire also attended by Campbell River fire crews

A worker covers up racist graffiti along the West Shore Parkway. (Courtesy of Anna Young)
RCMP investigating racist graffiti spotted off West Shore Parkway

Hateful vandalism is rare, says Langford bylaw enforcement

Greater Victoria Emergency Response Team and Victoria police executed a high-risk warrant arrest on Jan. 22. (Black Press Media file photo)
Victoria police arrest man wanted on multiple warrants

Warrants include drug trafficking, theft and possession of firearms

Most Read