The dolphin that recently appeared in the River Dee in Wales was fortunate to survive. Being a marine species, it was not used to a fresh water environment and very nearly perished after beaching on a sand bank. Fortunately, the RNLI were able to rescue the animal and return it to the sea where it could more easily hunt and find food.

Not all marine cetaceans that find themselves caught upriver are so fortunate. On Tuesday 27 August, at around 8.30pm, Greg Fonne took the following image from the Thames embankment, just east of Tower Bridge.

The animal in question appears to be a Harbour Porpoise, or Phocoena phocoena.

The Cetacean Strandings Investigation Programme (of which we are a part) records around 300 cases of dead Harbour Porpoise on UK coasts each year. On many occasions, we collect the bodies, and take them for post-mortem examination. This is because we want to find out the cause of death, as well as monitoring levels of disease, toxins and pollutants, parasites, and all kinds of things that can only be discovered from taking a look inside the animal.

This year marks the 100th anniversary of the Museum's whale and dolphin strandings monitoring programme. This porpoise found in the Thames will add to our data which shows us how populations are changing.

Cetacean statistics

Our data shows that in recent decades, the number of reports has increased dramatically. This could be explained by an increase in strandings, as well as an increase in communication methods and their ease of use and, of course, by the ever increasing human population with their eyes on the coast.

While the death of these beautiful animals seems a somewhat tragic event, an increase in the number of strandings is not necessarily a bad thing. It is evidence that the animals are living in UK waters, and surviving to breeding age. Through our work, which is government funded, we can keep watch on the effects of human behaviours on cetacean species.

Please help us to continue our work by spreading the word about the UK Cetacean Strandings Investigation Programme, and by following us on twitter @WhaleStrandings.

Find out more about the Museum's Cetacean strandings project

Meet us in person at the Oceans Station at Science Uncovered on Friday 27 September

Woo!

I particularly like this bit ‘"The porpoises have found a way to not only avoid the ships, but it's also the noise they make," says Keener.’

Harbor porpoises haven't been seen in San Francisco Bay for more than 60 years. But now, they're coming back through the Golden Gate in growing numbers and researchers are trying to understand why they’re returning.

 

 

 

 

 

The best place to look for them is 220 feet above the water on the pedestrian walkway across the Golden Gate Bridge. That's where Bill Keener of Golden Gate Cetacean Research photographs them, holding a massive telephoto lens over the side of the railing.

 

 

 

"There's a porpoise right there, coming very, very close," he says pointing. A dark shape appears in the water. It's a harbor porpoise, coming up for air. "And here's a mother and calf coming straight at us."

 

 

 

Source: http://blogs.kqed.org/newsfix/2011/12/05/after-60-years-porpoises-return-to-san-francisco-bay/

 

We've had quite a few reports in recently and I'd like to thank everyone that has reported to us. Even if the animal is just a bag of bones and blubber (it happens more then you'd think), we still want to hear about it!

Notably I'd like to thank the Reciever of Wreck and London coastguards who have helped us today with the pick up of a harbour porpoise, in Chiswick London.

Sadly a common dolphin at Shaldon beach, South Devon had to be disposed of as we couldn't organise a driver for it to be picked up (people are always busy during the school holidays), but a massive thanks to Sarah and Paul for all your help and I'm sorry we couldn't make it work.

Lastly a massive thanks to Dave and the owners of Woolacombe beach (nice work if you can get it), who helped us pick up a young common dolphin from North Devon a few weeks ago.

It's not unusal for bottlenose dolphins to attack harbour porpoises, it's something we've known about for years and is often their largest cause of death here in the UK. I wanted to put the link up for this as I know it's not very commonly known about outside scientific cetacean research circles and also as it's very rare to get pictures.

It had two badly broken jawbones, fractured ribs on both sides and a broken scapula, evidence of a sadistic attack. Worst of all, the female porpoise, which had been seen twice before and identified by researchers in Monterey Bay, was lactating when she was killed, according to marine biologists.

 

It was a clear case of what scientists are calling "porpicide," the deliberate slaying of a harbor porpoise by a surprising and, to most people, unlikely culprit.

 

"We suspect that it was a bottlenose dolphin," said Bill Keener, a researcher for Golden Gate Cetacean Research.

The brutal battering wasn't an isolated incident. Scientists say there has been a dramatic increase in dolphin attacks on harbor porpoises along the California coast over the past few years, including an attack Wednesday off Half Moon Bay.

 

Read more: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/09/16/BADK1L3JVQ.DTL#ixzz1YOpvZF00

 

 

 

 

Had a couple of animals coming in over the weekend at this stage they are all believed to be harbour porpoises, although I'm waiting on photos to confirm this.

1 came in on Berwick beach in Northumberland, thanks to the local council for all their help with this animal.

1 at Thurlstone beach in the Wirral, thanks to Gemma for reporting it and for still managing to find time to chat to me this morning dispite dogs and kids all wanting her attention!

Finally thanks to HM Coastguards at Happisburgh for reporting their porpoise that stranded at Cart Gap in Norfolk.

A few weeks ago we had a report of one harbour porpoise in Waxham and one unidentified (rather smelly) cetacean in Brancaster harbour.

A massive thanks to the coastguard for forwarding this information to us!

Harbour porpoise stranded at Bridlington on Monday, looked like it hadn't be dead long but sadly we were unable to pick it up for post mortem.

Thanks to BDMLR for the report.