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  • In Gansbaai, the largest white shark ever caught was at Danger Point and measured up to 5.9m. The exact world record white shark is a contested issue, but chances are it is between 6-7m.

  • If you see a white shark in the water don’t panic. Chances are high that the shark has already detected you and isn’t interested. White shark attacks are normally associated with poor visibility, so avoid murky conditions.

  • White sharks have a unique system called a “counter current heat exchange”, which keeps their body  tempreture +/- 7C above the surrounding water temperature. 

  • All sharks have an incredibly unique system on the tip of their nose called the “ampillae of Lorenzini”. These are small pores filled with a gel that transmits the electrical currents in the water to the shark’s brain so that it can assess its environment.

  • White sharks give birth to live young (not eggs), and they give birth to 6-8 pups at one time. Pups are usually between 1.0-1.5m in length and are born with teeth.

  • Body language has been a well documented form of shark communication and has identified body arching, jaw gaping, and other postures as specific social tactics.

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Daily Trip 29 April 2012 | Shark Diving in Gansbaai

Monday, April 30, 2012 |  0 Comment

Author: Oliver Jewell (Marine Biologist)
Born in London, England, Oliver has been in South Africa for the past 4 years after earning a BSc (hons) in Oceanography from the University of Southampton. His first experience with Great White Sharks was similar to many people's only experience - watching the film Jaws. Since that day, he has been dedicated to learning everything he could about sharks and ways of protecting them.

29/04/2012

Location:
Shark Alley
Water Temperature: 14 'C
Depth: 5m
Visibility: 7m+
Number of Sharks: 4
Conditions: overcast and slightly choppy.

Winter is well on it's way and we headed out to Dyer Island in anticipation of seeing large sharks in Shark Alley. We were rewarded with a large and fairly agressive male in the opening half hour of our trip. You could clearly see his well definied claspers, a good indication that he is a mature male. After several quick passes and one or two lunges at the bait he moved on in search of bigger rewards for his curiousity - the seals of Geyser Rock better have been prepared! We next had a more relaxed sub-adult, just over 2.5m in length come to investigate us. We were lucky to have this shark stay with us for the rest of the trip and each of our divers got time in the cage with this young shark. Finally two of the larger sharks of Dyer Island came to visit. Both were around 4 meters and spent a few minuets with us before heading back to Geyser Rock in search of seal prey.

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