Newsletter: Warmer and warmer

Hi divers

Weekend dive plans

Friday: Shore diving at Long Beach at 10.00 am

Saturday: Launching from False Bay Yacht Club at 7.00 am for a double tank dive

The days are getting longer and the daytime temperatures are slowly creeping upwards… Well, on some days. Saturday looks like a better bet for False Bay with Hout Bay being an option on Sunday. The water colour off Dungeons has improved slightly today.

Tomorrow I am shore diving students at Long Beach at 10.00 am. On Saturday we will do an early False Bay double tank dive at 7.00 am. Let me know if you’d like to get wet.

 

DAFF octopus fishing gear
DAFF octopus fishing gear

Here’s a little bit of reading on the octopus fishery in False Bay (courtesy of Yvette!). This NSRI blog post, and the comments, are also required reading.

Coming up

As part of First Thursdays, you can attend the opening of the Birdlife Oceans of Life photographic exhibition at the South African Museum on the evening of Thursday 6 October. There’s information here (facebook) – this year’s exhibition includes a retrospective of the last few years’ best images.

Diversnight is on Saturday 7 November, so start charging your torches!

regards

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

Diving is addictive!

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Monitoring the Oceans from Space MOOC

As your self-appointed education officer and fellow perpetual student, it is my duty to inform you of an upcoming MOOC on the Futurelearn platform, entitled “Monitoring the Oceans from Space“. In the five weeks of the course,  which starts on 24 October, you will learn about using satellite data to monitor the health of the oceans. You will also learn how to access some of the ocean monitoring data that is collected every day about weather phenomena, icebergs, sea levels, ocean temperature, and more. If you’re into creating your own visualisations or crunching numbers yourself, this should appeal.

The course is presented by EUMETSAT and was developed by Imperative Space in partnership with Plymouth Marine Laboratory, the National Oceanography Centre (Southampton), CLS France and NASA JPL.

Read more about the MOOC here, and register here.

Here’s a trailer:

Regular service on this blog should resume in the forseeable future; it’s been a heck of a year, so forgive us!

Newsletter: Copycat weather

Hi divers

Weekend dive plans

Sunday: shore or boat dives, depending where the viz is!

A cold front arrives tonight and will make itself felt until Saturday evening. Sunday will be best for diving. I have student dives to complete; if the inshore conditions are good, we’ll shore dive. If the visibility is only to be found further out, we’ll launch Seahorse. If you’re keen to get wet, let me know and I’ll update you on Saturday afternoon.

Storm clouds
Storm clouds

Keeping out of trouble

There’s lots going on as we sail into spring:

regards

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

Diving is addictive!

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Newsletter: Adventure diving

Hi divers

Weekend dive plans

Sunday: late morning dives, location to be determined by the weather!

It is once again one of those weekends where diving will be best on Sunday. “But where?” is the million dollar question. Humping south easterly wind on Saturday may or may not mess up False Bay entirely, and may or may not be enough to clean the Atlantic. So it’s a Sunday diving day, and a late Saturday decision on where and what time… More vague than that I cannot be. If you’re up for this undetermined diving adventure, let me know and I’ll keep you posted about what’s happening where.

Diversnight 2016

Before a Clan Stuart night dive
Before a Clan Stuart night dive

Diversnight is happening on 5 November this year (thanks CvS for the reminder)! This Norwegian night diving initiative has origins that include cake, which is all you need to know. If that’s not enough for you, read more here and here. Participation is free of charge, the more the merrier. I’ll remind you closer to the time so that you can get your torch batteries charged.

regards

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

Diving is addictive!

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Newsletter: Destination unknown

Hi divers

Weekend dive plans

Saturday: Shore dives in Simon’s Town (only if forecast south easter does not materialise)

Sunday: Launching at 9.00 am and 11.30 am in Hout Bay or Simon’s Town

Sunrise over False Bay
Sunrise over False Bay

There is a good chance that diving could be good on both sides of the peninsula on Sunday. Saturday will be made unpleasant if the strong south easterly winds and predicted swell arrive, so Sunday will be the best choice for diving. (If the weather is good and wind is mild on Saturday, we will shore dive in False Bay.)

False Bay may be good if the swell does not turn as southerly as forecast, or if the  south easter doesn’t quite get up to the 40 km/h in the forecast. If the wind does arrive, then Hout Bay should clean up enough for some decent conditions.

We will launch on Sunday at 9.00 am and 11.30 am, destination unknown. We will decide late on Saturday whether we will go to Hout Bay or False Bay on Sunday. Either way both dives will be suitable for Open Water divers, maximum depth 18 metres.

regards

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

Diving is addictive!

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Newsletter: Pretty perfect

Hi divers

Weekend dive plans

Sunday: Boat dives from False Bay yacht club at 8.30 am to Roman Rock or Photographers Reef / divers’ choice for the second dive

The forecast for the weekend is really good with almost no wind or swell. False Bay is a pleasant colour and temperature.

Our plan is to meet in the False Bay yacht club parking lot in Simons Town at 8.30 am on Sunday. We will most likely dive Roman Rock or Photographers Reef for the first dive and let divers’ choice determine the site for the second dive.

Jetty behind the aloe
Jetty behind the aloe

Handy info

The toilets at the Simons Town jetty are currently closed for renovations as I understand it. They are due to be ready soon but I do not have a date. Also note that the Wharf street parking at the jetty is again a paid parking area for the season.

regards

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

Diving is addictive!

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Newsletter: Mountains

Hi divers

Weekend dive plans

Saturday: Boat dives at 10.00 and 12.30 from Hout Bay or False Bay yacht club

It may seem that given the week-long south easter we are having, it would be a simple matter to decide which side of the peninsula to dive. The picture was taken from Chapmans Peak drive today around lunchtime, and the water is not very clear – there are rocks just below the surface in the little bay below the road, but they are hardly discernible.

View from Chapmans Peak drive
View from Chapmans Peak drive

The water colour in False Bay is not very different but False Bay does seem to recover faster than the Atlantic coast of the peninsula. Sunday’s forecast is for gale force winds, so Saturday is the only decent diving day, but where?

Depending on tomorrow’s wind direction I will make a call late in the afternoon on whether we will launch in False Bay or out of Hout Bay. Either way it will be for dives at 10.00 am an 12.30 pm. I will have mostly Open Water students so the maximum depth will be 18 metres.

Email, text, wolf whistle if you want to dive.

regards

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

Diving is addictive!

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Newsletter: Cocktail weather

Hi divers

Weekend dive plans

No dives

We are in a phase of semi-decent weekday diving and dodgy weekends again. We had fairly good False Bay diving during the week, but the weekend forecast is not ideal for much beyond storm chasing. Strong winds and some significant swell topped off with a dash of rain are hardly a cocktail for diving. Northerly wind is not that great for False Bay and neither is a 5 metre swell, so best you pursue some other form of activity this weekend.

Sightings

One of the guys in the Underwater Cape Town facebook group reported a sighting of a john dory at A Frame this week. These fish are striking, solitary, and seldom seen. Bizarrely for such an exotic-looking fish, they are popularly served wrapped in newsprint with a side of chips. We were lucky to spot one at Long Beach a few years ago. (Go check out the video on Underwater Cape Town for a better idea of what they look like, and keep your eyes open next time you go diving!)

John Dory at Long Beach in January 2010
John Dory at Long Beach in January 2010

Talks talks talks

This Wednesday 17th is the nautical archaeology talk I mentioned in last week’s newsletter. There’s a talk on 23 August about the health of our fish stocks by scientists Colin Atwood and Jock Currie at Bellville Underwater Club – info on facebook. If you have a UCT staff or student card, you can listen to conservation photographer Thomas Peschak speaking on 21 September – info on facebook, too.

regards

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

Diving is addictive!

To subscribe to receive this newsletter by email, use the form on this page!

Sharks! MOOC videos (part II)

Here is a selection of the videos for weeks three and four of the recent Sharks! MOOC hosted on edX. You can find weeks one and two here. All the videos are available on youtube if you’re really interested – you can check out the channel containing all this year’s videos, or a giant playlist containing all the videos from the 2015 iteration of the course.

Dark shyshark on the sand at Long Beach
Dark shyshark on the sand at Long Beach

Week 3: Thinking like a Shark – Brains and Behavior

Introduction – thinking like a shark

General organisation of the nervous system

Brain regions overview

Brain size

Prey localisation

Seeing underwater

Eyes for deep water

Lateral line system and Ampullae of Lorenzini

Electric snouts

Group hunting – broadnose sevengill sharks – an interview with Dave Ebert on research he did decades ago on the sevengill cowsharks of Millers Point

Week 4: Sharks in the World – Human Interactions, Ecology, and Conservation

Introduction – sharks in the world

What sharks eat

Food webs

What eats sharks?

Deep water communities

Shark struck

The problem with shark nets

Why are aquariums important?

Husbandry

Industrial fishing

The art of Ray Troll

Sawfish DNA

Sharks! MOOC videos (part I)

I completed the edX-hosted Sharks! MOOC, presented by Cornell University and the University of Queensland, and it was excellent. The content was clear and for me, who stupidly quit high school biology at the age of 14 for the sake of a more classical (less useful) education, filled in a large number of gaps in my understanding of sharks and rays.

The course format was a mix of video lectures and interviews, notes, diagrams and multiple choice questions for grading purposes. The videos are available on youtube – you can check out the channel containing all this year’s videos, or a giant playlist containing all the videos from the 2015 iteration of the course.

I’m going to link to some of the most interesting videos below, so you can get a taster of what the course was like. Please sign up next time it gets offered, if you didn’t do so this time!

Broadnose sevengill cowshark at Shark Alley
Broadnose sevengill cowshark at Shark Alley

Week 1: The Big Shark Picture – Biodiversity and Evolution

Intro – the big shark picture

Shark tracking

Light, depth and landforms

Habitat dive

Hotspots

Origins of taxonomy

Start with the fins

Skeletal anatomy

14 living orders

Species discovery

A walk through deep time

Bear Gulch – a golden age of sharks

Megatooths of Maryland

Week 2: Miracles of Evolution – Functional Morphology and Physiology

Introduction – miracles of evolution

Why a hammerhead?

How shark tails work

Drag

Oil and water

Edged weapons

Blue shark vs white shark

Pursue or ambush?

Manta ray feeding and migration

Shark vs mammal circulation

Breathing water

Countercurrent gas exchange

Osmoregulation in the bull shark

Greenland sharks

Reproduction in the sand tiger (ragged tooth) shark

Modes of reproduction

Week 3 (shark brains and behaviour) and 4 (sharks in the world) videos will follow in a separate post.