Ships In Washington-BC Strait Asked To Slow Down Again For Orcas
The call is going out again to the operators and pilots of big ships to slow down in the shared border waters between Washington and British Columbia. The idea is to reduce underwater noise that could bother endangered killer whales.
The voluntary vessel slowdown zone covers the length of Haro Strait, a busy shipping channel separating Victoria and Washington’s San Juan Islands. It’s also a vital summer feeding area for endangered orcas.
The Port of Vancouver, Canada, is leading the charge to reduce the impacts of vessel noise on the killer whales. A two-month trial slowdown last summer and fall demonstrated how cutting ship speeds to 11 knots could significantly reduce the racket underwater. Noise interferes with whale feeding success.
Beginning next month through September, the port authority is again asking cargo ships, tankers, cruise ships and ferries to slow down, but this time only when whales are confirmed in the area. That should result in fewer vessel delays.
Based on analysis of last year’s data, the Vancouver port’s environmental program identified “optimum speeds” for different vessel types to balance underwater noise reduction against potential operator inconvenience. This year the port is requesting that vessels transit the Haro Strait at the following speeds, “where it is safe and operationally feasible.”
- 15 knots or less – container ships, cruise liners and vehicle carriers
- 12.5 knots or less – bulkers, tankers, Washington State Ferries and government vessels.
“These speeds are estimated to result in delays of 11 to 18 minutes,” the port’s ECHO environmental program said in a newsletter Thursday. “We hope that this smaller delay will improve participation from all vessel types and in particular, bulkers and tankers.”
Scientists will again correlate vessel speeds on the surface with decibel readings from a network of hydrophones on the seafloor along with human observations of whale behavior.
Separately, the Washington Fish and Wildlife Department has established a voluntary “no-go” zone for boats of all kinds in a one-qaurter to one-half mile wide strip along the west shore of San Juan Island to reduce disturbance to orcas at that prime feeding and lounging area.
The population of resident killer whalesin the shared border waters of Western Washington and southwestern British Columbia has dwindled to 75 individuals. Orcas primarily use sound—including echolocation—to hunt for food, orient and communicate. Ship noise can mask the whale calls, effectively blinding the mammals, whose ears in a lot of ways act as their eyes.
Canadian and American government agencies have identified physical and acoustic disturbance as one of the key threats to survival of the iconic killer whales.
The Port of Vancouver, the primary destination for large vessels transiting Haro Strait, is also trying to incentivize quieter ships by discounting harbor fees for ships that meet low-noise criteria.
Copyright 2018 Northwest News Network
The government of Canadian Prime Minister Justin Trudeau has announced that it is buying the pipeline from Texas-based Kinder Morgan. The pipeline, built in 1953, currently carries 300,000 barrels of heavy tar sands oil daily from Alberta to British Columbia and refineries in Washington state. Continue Reading Washington Tribes Vow To Fight Canadian Pipeline With ‘Brothers And Sisters In The North’
Researchers at Oregon State University have worked out a way to detect and identify whales long after they move on — just by sampling the water. Continue Reading Tracking Whales In Puget Sound Is As Easy As Following Genetic ‘Bread Crumbs’ Left Behind
While searching for seabirds in July of 2017, biologist Luke Halpin instead saw a sea bubbling with about 200 bottlenose dolphins and 70 false killer whales. It would be an unusual sight anywhere — bottlenose generally travel in much smaller groups — but Halpin’s sighting was made more remarkable by where it happened. These usually tropical animals were off the west coast of Canada. Continue Reading Tropical Dolphins Are Appearing In Pacific Northwest Waters