Newsletter: Getting wet

Hi divers

It has been a lean week with very few opportunities to go diving. Last weekend was no better. I spent Friday out on the bay in very misty grey conditions and the weekend was just too windy and rainy. A consolation for the wet and wintry weather has been the presence of a very relaxed pod of dolphins in Fish Hoek Bay and Mackerel Bay (where the wreck of the Clan Stuart is) for most of this week.

Ark Rock in the mist on Friday
Ark Rock in the mist on Friday

This weekend sees the arrival of some wet weather, some wind and a host of conflicting reports of a huge swell. Earlier this week the swell was predicted to be close to 10 metres. Some weather sites still predict 7-8 metres but only arriving on Monday. Some sites claim there is a 4 metre swell in the bay right now but that is not there. I drove down the coast this afternoon looking.

Dolphins near the Clan Stuart
Dolphins near the Clan Stuart

Anyway, regardless of who is and isn’t correct with the predictions, the wind and pouring rain will most certainly keep me from diving this weekend, and whether the swell is 4 or 10 metres, it’s going to be big. Sorry about that!

Travel

When the weather is this bad it helps to plan a trip to warmer waters to take your mind off how wet your socks are. We’re off to Durban on 17 June – if you act fast you can still join us – and the Red Sea in October. Let me know if you want more information on either trip.

regards

Tony Lindeque
076 817 1099
www.learntodivetoday.co.za
www.learntodivetoday.co.za/blog/

Diving is addictive!

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Article: Wired on orcas hunting dolphins

Ever interesting Wired.com shared a photo gallery and brief article about an attack on a pod of dolphins by some wild orcas in Monterey Bay, California. It’s both spectacular and disturbing to see how one of the orcas rams a dolphin and flips it right out of the water like a tiny toy. Once the dolphin is stunned, the orca can move in for the kill. Killer whales are extremely intelligent, social, and complex creatures. They should not be kept in captivity. (Some people even believe they should have rights, like humans.)

I must share this fascinating nugget from the article. After the recent sightings of killer whales in False Bay, Tony and I were debating what an orca would do upon encountering a human in the water: investigate, see them as potential prey, or something else. Here’s a theory:

There has only been one (moderately reliable) account of a wild killer whale attacking a person, Ford said, an accidental encounter involving a surfer in the 1970s. Since then, people have described orcas zooming in for close inspections, but veering away at the last minute. Why they ignore humans is a mystery. It could be that orcas haven’t recognized that humans are edible, or it could be that neoprene wet suits typically render divers opaque to orca sonar. The nitrogen bubbles embedded in the rubber not only thermally insulate a swimmer, but in a stealthy coincidence, are acoustically reflective.

How fascinating is that? Read the full article here.

A Day on the Bay: Distant dolphins

Date: 26 February 2013

Kate, Craig and Mark on the jetty
Kate, Craig and Mark on the jetty

Late in February we took an afternoon boat ride down to the broadnose sevengill cowsharks near Miller’s Point. I had students, so Mark skippered for us. The inimitable Kate had arrived from the UK a few weeks ago and wasted no time making trouble!

Craig and Kate disagree mildly
Craig and Kate disagree mildly

We were fortunate to see some dolphins in the distance on our way back from the dive.

Watching dolphins
Watching dolphins

It was late afternoon by the time I took the boat home. On the way past the wreck of the Clan Stuart I had to stop and take a photograph as the sun was setting.

The Clan Stuart at sunset
The Clan Stuart at sunset

If you’re wondering why every photo looks as though there’s a cloud of tiny black bats in the background, it’s because the sensor on my camera was BADLY in need of a clean. Thank you Orms for sorting it out!

Kidnapping a baby dolphin to save a pod – an ethical dilemma? Or not?

Staying on the subject of marine mammal strandings, here’s an interesting series of events that took place at the Two Peoples Bay Nature Reserve in Western Australia. Initial reports on 2 February this year indicated that between 100 and 150 pantropical spotted dolphins were milling about in knee deep water. One of the dolphins was dead.

In order to herd the pod out into deeper water, and avert a potential mass stranding, officials removed a baby dolphin from the pod and transported it into deeper water. Its distress cries attracted the attention of the remainder of the pod, who then swam out into deeper water to where the calf was, joined it, and subsequently out to sea. They were not seen again.

I think this is a fascinating and incredibly innovative solution to what is usually a very upsetting problem and one that rarely has good outcomes. Do you think the end (saving up to 150 dolphins from stranding on a beach) justified the means (causing temporary distress to a young dolphin, its mother, and the rest of the pod)?

Media releases from Western Australia’s Department of Environment and Conservation:

Article: Der Spiegel on salvaging the Costa Concordia

While on the subject of cruise ships, let’s turn to an article in Der Spiegel about the salvage operation that is to be undertaken on the wreck of the Costa Concordia cruise ship, currently aground (on her side) off the island of Giglio, Italy. The ship ran aground in January 2012; a year later, salvage teams under the leadership of a South African, nogal, began work on her.

Briefly, the salvors plan to roll the ship upright, refloat her with air-filled containers, and tow her into harbour. There’s an illustrative graphic that acoompanies the article. It makes it seem a quick and simple process, but the salvage is expected to cost US$300-400 million and will take months. It’s the largest salvage operation ever attempted. The ship is not being dismantled in place because it is lying in the middle of a marine sanctuary with sensitive populations of cetaceans and other creatures. According to the Christian Science Monitor, to protect the whales and dolphins from the noise of the drilling associated with the salvage, the salvors create curtains of bubbles around the drill sites by blowing compressed air into the water. These curtains absorb much of the sound.

If you want to remind yourself of how surreal the cruise ship looks, and looked in the time after she ran aground, there are photos here, here, here, and some terrifying ones taken inside the ship here.

Read the full Der Spiegel article here.

Article: Outside on communicating with dolphins

Outside magazine published a wonderful article by Tim Zimmermann in September 2012, describing the research of Denise Herzing (of the Wild Dolphin Project) into a specific pod of Atlantic spotted dolphin in the Bahamas. Among her research interests are attempting to establish communication between dolphins and humans, by synthesising the clicking sounds that these animals use to communicate. In order to do this, the researchers are first working to identify patterns of sound used by the dolphins, with the aim of decoding the patterns and “translating” their speech.

It’s an ambitious, exciting experiment. I think it appeals to me because nowhere is there any hint of wild-eyed bushy-haired fanaticism, or a secretly held dream that the dolphins “have so much to share with us” or whispers that they are expected to be purveyors of interplanetary wisdom. Dolphins are highly intelligent creatures, but they also spend an inordinate amount of time trying to have sex with one another (I can’t decide whether this confirms their intelligence, or happens in spite of it). The scientists do not seem (from this brief article) to be harbouring any expectations of enjoying particular avenues of discussion with the dolphins. This is important for good science, and in stark contrast to the musicians described in Thousand Mile Songwho are bent on imposing their musicality on whales but exhibit little respect for the very creatures they try to engage.

The article is a dreamy read that makes me want to run away and become a dolphin scientist (much as Dolphin Confidential did). Read the full piece here.

Belugas in captivity

The Georgia Aquarium has applied to import 18 beluga whales captured off the Russian coast to their facility in the United States. Beluga, like orcas and dolphins, are huge money spinners for marine parks and aquaria, but – like other marine mammals – their lifestyle in the wild suggests that they are simply not suited to life in captivity. The Georgia Aquarium hauls out the words to the familiar song about the beluga being ambassadors for their kind, fostering love for ocean animals among the visitors who interact with them, and conducting research. They repeatedly refer to their four existing captive beluga as being “in human care” rather than “in captivity”, as if they’re unable to fend for themselves in the wild.

Wired summarises the controversy nicely. It quotes the Georgia Aquarium communications officer as saying that:

In human care in accredited scientific institutions like Georgia Aquarium, these animals receive the highest quality veterinary care, the most nutritious food and the love and dedication of animal care experts.

Scientist Hal Whitehead is quoted in the New York Times as saying

We know that they are intensely social mammals with complex and lengthy migrations, and that they use a whole bunch of different habitats in different times of the year, and that they are acoustic communicators. There is no way even the best captive situation has even the slightest approximation to that.

Tim Zimmermann has posted regularly on his blog about this subject, and reports that not all marine parks believe that beluga – in particular – are suited to life in captivity. He also points out in another post that ambassadors are not usually forced into service – so calling captive beluga “ambassadors” for their species is dishonest.

The lifespan of cetaceans in captivity is frequently subjected to hot debate, with proponents of keeping dolphins, orca and beluga in aquaria stating that captive animals live long, full, stimulating lives and casting doubt on scientific estimates of cetacean longevity in the wild. Claims that scientific research is conducted on captive cetaceans are disingenuous – there has been almost no useful scientific output from the SeaWorld orca program, and all that seems to be learned is how to care for captive animals.

My view is that, even if the animals live longer in captivity (and this is by no means certain), it is a sterile, artificial, lonely existence which deprives the animals of the social interactions and complex stimulation that they’re able to enjoy in the wild. It is uniquely arrogant of humans to assume that scheduled “interactions” with a trainer can replace living in a large, dynamic social group of other whales. The parasites and peculiar diseases and ailments (such as folded over dorsal fins on orca, infections, and tooth damage from mouthing gates to their pools) that they suffer in captivity belie the claims of captivity proponents that the animals are kept healthy and provided with the best veterinary care.

The National Oceanic and Atmospheric Administration (NOAA) is expected to rule on the permit application early in 2013.

The New York Times article was followed up with a blog on the subject which is also well worth reading as it adds texture to the press article by considering some of the ethical issues more closely. The key point – to my mind – is made by a Canadian beluga researcher who says that keeping belugas captive is a decision that

… doesn’t belong to scientists alone. This should be the choice of a society.

For society to be able to make choices like this one, education and critical thinking is necessary. One has to look deeper, think harder, and not accept the facile, glib explanations for why keeping large animals in captivity is not only good, but necessary.

Friday poem: The Bluefish

Menhaden are a fish that fill a vital part of the food web in many parts of the world, specially the western Atlantic Ocean. Bluefish (called shad locally) are a popular gamefish (i.e. people fish them for sport – ugh!) and very aggressive hunters of other fish (such as menhaden).

The Bluefish – Isaac McLellan

(Pomatomus saltatrix.)

It is a brave, a royal sport,
Trolling for bluefish o’er the seas;
Fair skies and soaring gulls above,
A steady blowing breeze;
A shapely yacht whose foaming prow
The billowy plain divides,
That like a gallant courser speeds
Far, free o’er ocean tides.

First from West India seas they came,
Haunting the Cuban coast,
Cruel as Spanish buccaneers,
A fierce, rapacious host.
But now by Northern seaboard shores
Their murderous way they take,
From Mexic Gulf to Labrador,
Wherever billows break.
The weaker tenants of the main
Flee from their rage in vain,
The vast menhaden multitudes
They massacre o’er the flood;
With lashing tail, with snapping teeth
They stain the tides with blood.

Rakish are they, like pirate craft,
All matchless to assail,
With graceful, shapely, rounded sides
And the sharp, forked tail;
And when the angler’s hook is fixed
They fight, they struggling bleed,
Now leaping high, now plunging deep,
Darting with lightning speed.

And yet these sea marauders,
These tyrants of the main,
By fiercer, mightier ruffians
Are hunted, conquered, slain;
The tumbling porpoise hunts them,
Dorado fierce pursues,
And when the shark assaileth,
Blood-stains the waves suffuse.

Friday poem: Shoal of Sharks

The description of sharks as our “perpetual and perfect kin” is wonderful.

Poetry aside, this account reminds me of my darling friend Sharon, who once beached herself (in a head to toe pink wetsuit) at Llandudno, riding out of the sea and up the sand on her bodyboard, croaking “SHAAAARK!” in warning about the fins she had seen in the water. A lifeguard at whose feet she had landed looked down at her in resignation and replied “Dolphins.” (I am aware that a dolphin is not a porpoise.)

No one likes a pedant, but the collective noun for sharks is a shiver.

Shoal of Sharks – Richard O’Connell

“Oh, look at all the porpoise!” someone shouted
While passengers ran to snap their cameras;
But what they leaned toward was a shoal of sharks
Before us, moving like a floating island:
A seething multitude of tails and fins
Fleeing the fury of a hurricane
Hundreds of miles away. They splashed and swarmed.
Slashing the sea to threads of hissing foam
Beneath us, tossing bellies to the sun.
Staring into the blood pits of our eyes
Ferocious for the flesh and stench of us.
Lucky for us high on our high-tech ark
Looking back on life’s primeval broth
At such perpetual and perfect kin.

Newsletter: Diversnight international

Hi divers

The steps at the jetty have never seen so much traffic!
The steps at the jetty have never seen so much traffic!

Last night was the eighth international Diversnight. The aim was to get as many divers in the water as possible at 8.12pm, worldwide. We participated, diving below the jetty in Simon’s Town and really great conditions. 20 divers in total and a big thanks to OMSAC and Cape Scuba Club for joining us. Its not to often you can dive in the basin there as there is a fair amount of boat traffic during the day. The conditions were great given the winds we have had this week and the water was a clean 6 plus metres and 16 degrees. Thanks to Shaheen for being our official photographer!

Setting off on our night dive
Setting off on our night dive

The past week has been a very dry week with very little diving but the weekend looks exceptionally good. Last Saturday we took the boat out from Hout Bay to dive the Maori and the BOS 400 but the conditions in the bay were not that great and I felt it was too unsafe to dive. Whilst we were there we were visited by a pod of dolphins and spent 30 minutes on snorkel whilst they allowed us to swim with them. This was an awesome experience as they were very relaxed and swam really slowly amongst the divers and around the boat. There are more photos here.

Dolphins in Maori Bay
Dolphins in Maori Bay

This weekend

The wind finally drops, the swell turns to a westerly and I think False Bay conditions will be great. The water colour has remained blueish all week and I think the sites south of Simon’s Town should have great visibility. It also beats the cold Atlantic hands down and the temperature there this week has been between 8-10 degrees celcius.

Exiting the water at the jetty
Exiting the water at the jetty

I have quite a few courses  (Open Water, Advanced, Rescue) running right now so we are aiming for a lot of diving. Saturday we will be at Long Beach for Open Water and Rescue training and Sunday we will launch from the yacht club at 9.00 and 11.30.

regards

Tony Lindeque
076 817 1099
www.learntodivetoday.co.za
www.learntodivetoday.co.za/blog/

Diving is addictive!