Sharks have wandered our oceans for the past 400 million years, which is at least 200 million years earlier than the dinosaurs and 396 million years before the first hominids evolved. They began to diversify about 330 million years ago, and since then these ancient fish have proliferated, occupying almost every niche in the oceans. At the beginning of the Jurassic period, about 200 million years ago, the first ‘modern’ sharks developed.
The great white shark is one of evolution’s top success stories. Streamlined, with two dorsal fins, a powerful vertical tail, a flexible jaw that can thrust forward to feed, and growing up to 6 metres in length, they are almost perfectly adapted physiologically, biologically and behaviourally to their ocean environment.
A white shark in Fish Hoek bay (Photo: Enrico Gennari / Copyright: Alison Kock)
The Save Our Seas Foundation (SOSF) White Shark Research Team together with the Shark Spotters tracked a 3-metre great white shark for 24 hours straight. This was the first successful overnight continuous track of a white shark in False Bay.
Studying white sharks along the False Bay coast. Hours of surveying is required to spot the sharks swimming inshore.
Following reports from the Shark Spotters of shark sightings close to shore within the last two weeks in False Bay, the Save Our Seas Foundation white shark research team headed out to survey the coast for sharks and attempt to tag one of them. They found a white shark at 12h42 on Tuesday 8th December swimming along the surface between Seal Island and Strandfontein. After monitoring the shark’s behaviour for a few minutes the research boat slowly approached the shark to get a photographic identification of its dorsal fin, assign a catalogue number and determine the shark’s size and sex. After closer inspection it was determined that the shark was a 3-meter female, subsequently named Deepblue.
One of the highlights in the last few months was that I was invited to present our white shark research programme to the esteemed scientists and educators of the CoML International Scientific Steering Committee of this groundbreaking global initiative. (more…)
I just returned from Sanibel Sea School in Sanibel, Florida, where we filmed kids for The Riddle Solvers Shark Episode. One of the highlights was this pre-teen, 40 foot long whale shark, made by hand, out of sand over the course of two hours (of course, you’ll see it all happen here in about 20 seconds).
Why did we film this? Well, our shark episode is about, of course, sharks. And while we try to solve the riddle in our movie, we get help from these children who attended a week long “shark camp”.
Sanibel Sea School Sign
Sanibel Sea School features week-long camps of various topics during the summer (manatee week, sea turtle week, horseshoe crab week, plankton week, etc.), and we were fortunate that the school invited us to spend time with them during shark week.
What exactly did kids do during shark week?
Well, they made shark-based art projects, like a large puzzle-piece bull shark. They played shark jeopardy. They conducted a “shark attack” where they visited local businesses and used chalk to draw shark facts and images on sidewalks. They snorkeled and surfed and had paddle races.
They even tried to save two young black-tip sharks that were caught in a commercial fishing net. Bruce Neill, the school’s founder, tried for hours to save the black-tip sharks that a fisherman found in his bycatch. He held them under running water to get oxygen through their gills, but unfortunately, the sharks were too far gone. As a result, the kids were able to see shark dissection (at least the sharks went to good use). Have you ever seen how big a shark liver is? Trust me, it’s amazing.
Shark Dissection
My highlight was filming the whale shark on the beach. We spent several days with the school’s staff, scheming about how to build the whale shark. Bruce Neill kept consulting shark guides and measuring textbook drawings with his calipers, so that we would be sure to build the whale shark and its fins to scale. We originally wanted to build a full grown 50 foot shark, but that would make the shark way too tall to conceivably build it out of sand in just a couple hours. So it ended up being a smaller, 40 foot shark . . . the kids used dark seaweed collected from the beach to create the shark’s skin. Then they used globs of sand to create the spots. Finally, they collected white shells to create the gills. I am incredibly thrilled with the footage we got during the week, and I think it is going to be a great addition to the shark episode.
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