Changing course could save blue whales

2014-07-24 05:00
Whales and ships don’t mix. (John Calambokidis, Cascadia Research, AP)

Whales and ships don’t mix. (John Calambokidis, Cascadia Research, AP)

Multimedia   ·   User Galleries   ·   News in Pictures Send us your pictures  ·  Send us your stories

Washington - Blue whales off the US west coast like to feed in areas that are heavily used as shipping lanes, a practice that puts their survival at risk, researchers said on Wednesday.

Their favourite food is krill, a tiny shrimplike sea creature, and they typically return each year to the same places to find it, according to the study in the journal PLOS ONE.

This habit could be the reason why their population is not rebounding as experts had hoped, and researchers suggested that changing shipping routes could help.

For the study, led by Oregon State University and the University of California, Santa Cruz, researchers tagged 171 blue whales off the coast of California from 1993 to 2008.

The overall population of blue whales in the area from California, Oregon and Washington in the Northern Pacific Ocean is estimated at between 500 and 2000.

Scientists tracked the tagged whales' movements with satellite data, representing "the largest and most comprehensive collection of tracking data for any whale species," said the study.

They found that the whales typically followed similar circuits for foraging, moving southward early in the summer and heading northward as the season progressed.

Since whales may be killed in collisions with ships, the researchers suggested this risk could be reduced if boats took different routes at certain times of the year.

"Closing the northern shipping lane heading to and from the ports in San Francisco Bay during August to November may help to reduce the likelihood of a ship strike in this area for blue whales," said the study.

Whale strikes

"While we show that blue whales used the entire southern California waters, the high-use area at the western part of the Santa Barbara Channel suggests that moving the shipping route southwards would reduce the risk of ship strikes for blue whales, particularly during July to October," it added.

Researchers said a previous study involving endangered right whales in the Bay of Fundy off eastern Canada found that changing shipping lanes cut by 80% the likelihood of vessels striking the creatures.

The blue whale population was depleted by commercial whaling early last century but gained protection from the International Whaling Commission in 1966.

Between 10 000 and 25 000 of these endangered whales are believed to swim in the world's oceans today. Their numbers have not increased much in recent decades.

Blue whales (Balaenoptera musculus) can live 80 to 90 years on average, and their 30m long bodies can weigh around 20 tons.

Read more on:    us  |  whales

Join the conversation! encourages commentary submitted via MyNews24. Contributions of 200 words or more will be considered for publication.

We reserve editorial discretion to decide what will be published.
Read our comments policy for guidelines on contributions. publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
1 comment
Comments have been closed for this article.

Inside News24


Book flights

Compare, Book, Fly

Traffic Alerts
There are new stories on the homepage. Click here to see them.


Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.

Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire network.


Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.

Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.