Posted on Friday, 10 February 2012
The fact that Peter Bencheley purposefully chose to further heighten our fear of the Great white Shark by choosing night time as the scene for the opening attack and setting the trend for the rest of the book is significant.
To the uneducated there can be nothing more frightening than being stalked at night by a huge predator capable of devouring you in an environment that most of us are not comfortable in.
It may therefore come as a surprise to many that it would appear that the white shark does not actually use the cloak of darkness as its veil of cover to do most of its hunting.
Since 1991 I have worked with great white sharks on an almost daily basis, having engrossed myself in their world on the African, Australian and North American continents. Being around these unbelievably majestic creatures has not only taught me much about them but also left many unanswered questions.
One of these unanswered questions was what does this super shark do when the sun goes down and the ocean becomes a dark featureless world?
In 1996 along with Rob Lawrence we discovered that just 25 minutes from Cape Town city centre there was a place where great white sharks occured in large numbers but more interestingly they actually breached out of the water when catching their prey.
Seal Island False Bay is home to over 60 000 cape fur seals and during the months of May-September there is no better place on earth to see the sharks in action. Up until 2008 I had recorded 5451 predatory events and we learnt a great deal about how and why the sharks hunt. For the first few years all of our observations were made in the day but as we started seeing more and more predatory evidence before sunrise we became interested to learn what happened at night. We also knew from a Bryde’s whale carcass that we had watched 28 different white sharks consume in 18 hours in 2000 that the sharks certainly fed on a large food source like this at night.
In June of 2001 I decided it was time to find out if the sharks could actually catch a fast moving prey at night.
On a flat calm winters evening we arrived at the Island and went about anchoring up at an area known as the Launch Pad on the Southern end. We placed a large tuna tail in the water as a tempting morsel to attract any hungry white shark and we prepared for a long wait.
As dusk turned to darkness our senses appeared to become more acute. The seals cavorting on the island with endless barking, coughing and fighting seemed deafeningly loud. Although our anchor held firm the waves crashing into the rocks 80m away now sounded perilously close. Everything was somehow that much more intense.
After a few minutes of trivial chatter we heard the sounds of splashing very close by and were astounded to see that the seals were leaving the island by the thousands unlike the dribble of small groups we see in the day. All around us seals porpoised as they headed out to feed. After 20 minutes of cavorting seals a huge torpedo like shape broke into the curtain of light our halogen lamps threw on the water. Our invited guest had arrived The Great White Shark.
Initially the shark circled on the edge of our vision with the lights casting beautiful dancing shafts of blue light off it’s back.
As the great fish turned to come straight towards the boat it’s eyes caught the light and turned an eerie green. The sight instantly threw us back millions of years to when great beasts roamed the earth in all shapes and sizes and this prehistoric looking green eyed creature would have been perfectly at home.
The shark made several more passes and then took the bait and without much effort bit threw the thin natural fibre rope securing it to the floating buoy. This was a momentous occasion for us as there was little evidence other than what we had seen with the Brydes whale that white sharks fed at night. Many scientists believed that the rod to cone ratio of the great white’s eyes did not make it a likely nocturnal hunter.
Soon the first shark was joined by another and on that first evening we recorded no less than 5 sharks between 18h30 and 21h00. Strangely not all the sharks wanted the bait and some even appeared to be completely uninterested in us. By 21h00 only one shark still showed any interest and the rest had left us as quietly as they had arrived.
Seeing these amazing animals in the darkness was fantastic, it added a whole new dimension to them. They looked even bigger by night. We did several more trips in the dark hours of 2001, with mixed success. We noticed that almost without fail the sharks seemed to leave the area we were working in a few hours after darkness and returned again in the hours preceding sunrise.
On some nights the sharks showed more interest in us than on others but generally they seemed to just patrol in an area where the seals departed from occasionally paying us a visit on one of their circuits.
What was interesting though was the fact that the sharks appeared to be trying to hunt at night as well. Initially we just heard splashes or smelt the tell tale smell of a fresh kill.
We also were surprised to see the kelp gulls which pick up pieces left by a kill also flew at night hoping to pick up scraps .How these birds could see at night amazed me. Were they able to also listen and smell like we were and then home in on the source?
On one evening we sat idly waiting for a shark when little more than 50m away a shark blasted clear of the water with a clearly audible swoosh of water. A few minutes later the tell tale signs of a kill drifted past as the entrails of a freshly killed seals were the only reminder of what had been a living animal a short while back. In 2008 we again witnessed the sharks in action at night. We heard a great splash at our bow and when we cast our torch lights onto the scene we noticed a shark lunging out of the water in it’s attempts to catch a sub adult fur seal. As by day the seal remained calm under extreme pressure and after a few thwarted attempts the shark disappeared to once again stalk it’s next quarry.
This was irrefutable proof of the sharks hunting at night.
During the daylight hours we often towed decoys for short periods and saw spectacular full breaches. Whilst it is incredible to see these huge sharks in the air I do not like to tow the decoy for more than a half an hour as this wastes the shark’s energy if it jumps to often and gets no food reward.
I did however think it would be interesting to see what the sharks would do if a decoy was pulled over them at night where they would not be able to see the shape but only hear or feel it’s splashing and vibration. After only a short while we were left in no doubt that the sharks actually had little problem in finding and catching a potential prey item in complete darkness. A 4,0m shark rocketed out of the water, mouth wide open as it snatched the decoy off the surface of the water without any evidence of being an inferior nocturnal hunter.
Today we believe that the sharks are perfectly capable of catching seals at night but the problem is that there are very few individual targets available for the sharks unlike during daylight hours. The endless stream of outgoing groups makes for a confusing and difficult target for the sharks to isolate a single animal whereas in the daytime single young of the year seals make for a far easier and less threatening prey item to catch.
By 2004 we had a very good idea of what was happening at Seal Island at night. We had also undertaken a telemetric tagging project in 2000/2001 with Dr Rocky Strong that had shown the sharks did indeed leave the island as we suspected after a few hours after night fall and then returned in the hours before dawn.
What I now wanted to do was to dive at night with these massive sharks. The thought of being in the water when one of these formidable animals arrived excited me.
The sharks looked so beautiful with the lights of the boat dancing around them that I simply had to give it a shot and to be quite honest being in a cage is not exactly dangerous.
We were at Guadalupe island in Mexico and I had spent nearly 8 hours in the cage off our good friend Steve Drogin’s boat Destiny with a massive 15ft female circling me every 15 minutes or so. It was great. Steve’s boat had fantastic underwater lights and as the day’s last rays disappeared and darkness set in I expectantly waited.
For twenty minutes there was nothing other than the ever increasing feel of cold against my skin, was my friend of the daylight hours mysteriously gone?
As if by magic the huge shark suddenly just appeared out of the blackness and cruised slowly past the cage, magnificent, silent and with an unperceivable ease of movement.
Once again the great eye had a sheen of green and her elephantile girth seemed exaggerated by the shadows which danced along her flanks.
The sharks I saw at night both in False Bay, South Africa and those at Guadalupe Mexico seemed to cruise even more slowly by night than during the day. The sharks seemed to simply melt in and out of the shadows and certainly had little interest in me. There was no malice, no aggression, just a beautiful creature passing it’s time in a medium that it was so beautifully part of.
This was what it was all about. To have the world’s most formidable shark just feet away, all on my own in a world of darkness with only my thoughts as company was fantastic.
I eventually reluctantly climbed out of the cage my hands and feet wrinkled but my face alive with smiles.
The foreboding veneer of darkness may strike a cord of fear for many but for those of you open minded enough to plunge into the inky world of the great white shark you will be entering the next realm of spellbinding adventure………………………………….
For more information on expeditions to view the famous breaching great white sharks or to view more of Chris & Monique Fallows images and conservation work please view www.apexpredators.com