After decades of protection, you might think that the world’s whale population is safe.
You would be wrong, at least in part.
According to the WWF wildlife charity, seven out of the 13 great whale species are still endangered or vulnerable.
Commercial whaling is one of the challenges they face, with an estimated 1,000 whales a year killed for the market, says the WWF.
Other hazards include toxic contamination and the effects of climate change.
But a more recent danger has arisen, in the form of collisions with ships.
Doubling of death rates
Nowhere is this phenomenon clearer than in the Mediterranean.
It is now estimated that around 20% of whales found dead in the Mediterranean had collided with a ship.
When you consider that vessels weighing more than 100 tons cross the Mediterranean around 220,000 times each year, it becomes a little easier to understand why.
This stretch of water has become the maritime equivalent of London’s Piccadilly Circus, without the traffic lights.
One of the species particularly at risk is the fin whale.
A graceful colossus, measuring up to four meters (13 feet) in length, these creatures swim the Mediterranean’s blue waters in a number of areas, but often gather in pods in the northern region between Italy and France to feed.
One recent study published in 2006 by the Marine Pollution Bulletin estimated that there are around 3,500 fin whales in the Mediterranean.
But according to the same report, the numbers dying after collisions has doubled since the 1970s.
“They simply can’t get out of the way of the great cruise liners and other vessels,” says Marco Costantini, from the WWF in Italy.
And the cruise line market has been growing fast. According to Cruise Industry News, in European waters alone, passenger numbers have risen from 3.7 million in 2007 to 4.5 million this year.
A further 16 large vessels are on order for the European market, each one capable of carrying at least 5,000 passengers and crew.
All that extra traffic is potentially bad news for the whales.
The biggest obstacle to them is what is known as the ship’s “bulb”, the protruding section of the bow.
Its purpose is to direct the waves around the ship to lessen their impact on it, giving passengers a smoother ride.
But when the ship is at sea this extension careers through the water, under the surface, like a huge battering ram.
The whales do not stand a chance.
Whales: 2 knots. Ships: 22 knots. It is not hard to guess who is going to come off worse.
But now, thanks to a unique venture between one cruise company, WWF, and a number of other technology firms, help is at hand.
Four vessels, including the Costa Pacifica, owned by Costa Cruises, one of the biggest operators in the business, have been fitted with a software system called Repcet.
Repcet allows ships to share real-time information on the location of the whales.
Once a ship spots a whale, the co-ordinates are entered into the system. They are sent, via a satellite connection, to a server in France.
The server then centralises the data and sends out an alert to equipped vessels that are likely to be affected.
The alerts are displayed on a dedicated screen located on the ship’s bridge and it all happens in seconds.
In addition to accurately positioning the whale sightings, the system calculates and displays the associated risk zones. These are displayed as grey circles on the screen.
The system allows alarms to be programmed in, helping crew members to anticipate potential encounters, thereby avoiding the necessity of continuously watching the mapping screen.