Great White Shark Images

Great White Shark: Tagged to study travel

New Zealand (global-adventures.us): A record number of 27 great white sharks have been tagged by scientists in New Zealand. The tags will allow researchers from the National Institute of Water and Atmospheric Research (NIWA), Department of Conservation (DOC), and University of Auckland to study the periods during which the sharks inhabit ‘hotspot’ locations such as New Zealand’s Stewart Island, whether they are residents or transient at these locations.

Great white sharks have to be attracted to the boat with a mixture of tuna oil and minced tuna. When the shark is close enough, a long pole is used to attach the acoustic tag to the shark. The shark has to be at the right angle to the boat, as the pole is used to stab the anchor into the muscle below the dorsal fin. That part of the shark is only exposed for a short time as it swims by.

“Previously we have used “pop-up” tags. They stay on the shark for a predetermined time and record depth, location, and temperature, so they are useful for tracking shark movements to the tropics and back. After about a year the tag “pops up” and transmits its data via satellite,” says NIWA Principal Scientist Dr Malcolm Francis. The cost is about $5,000 for each tag.

“But on this trip we mostly used acoustic tags as we wanted information on a small scale, which we get with acoustic tags - it’s accurate to within a kilometer - and they are cheaper at $400 a tag,” says Francis.  “On our best day we tagged five sharks. Our previous record for an expedition was nine sharks tagged at Stewart Island in 2009. The acoustic tags send out a coded pinging sound that is unique to every shark. Data loggers can record when each shark is present by detecting their pings. The data loggers have a range of up to 0.6 miles (1 kilometer), and we deployed 25 of these on moorings around northeastern Stewart Island and Foveaux Strait. The tags’ batteries last for two years, and the data loggers will be left in the water for that duration. We will download data from the data loggers at 3 - 6 month intervals.”

Great white sharks are individually recognizable from their color pattern, particularly around their gills and on the tail, and the pattern of notches on the trailing edges of their dorsal fins. Department of Conservation scientist Clinton Duffy says the scientists are “compiling a catalogue of photo-identifications.  We are using underwater video cameras to try and determine how many sharks occur around Stewart Island. By combining the photo-IDs and the acoustic tag records, we should be able to build up a detailed picture of which sharks are seasonal residents, where they hang out, and how long and when they are there.

Great White Sharks Video

Check out these amazing photos of Great White Sharks... I thought that the more I knew about them, I'd find them less terrifying. Not true at all. The dramatic pictures documenting the attack on a seal, was taken near Seal Island, in False Bay. Theyre part of a decade-long campaign to promote positive awareness of great white sharks, which are classed as "endangered" largely due to being hunted by man. The wildlife photographer Chris Fellows spends over half of each year waiting off the coast of South Africa to capture the sharks at their grisly work. The shots capture the splendor and horror of a great white shark weighing two tons leaping 10ft from the water as it closes inevitably on its victim. On occasion the photography team used an artificial lure to attract the sharks before snapping them in action with the seals. The ultimate predator & nature's most efficient killing machine, it can hunt and kill its prey with remarkable ease. The average great white in the waters around Seal Island measures between 12-16ft, with the biggest being a near 20-feet long giant spotted in 1997. After reaching speeds of up to 35mph on its ascent from the depths, the shark uses serried ranks of razor-sharp teeth to tear into the seal. "The sharks feed on young seals when they are attempting to return to Seal Island after a few days out feeding," Mr. Fellows said. "The sharks will bite the seal, typically in half in the first go, and then come round and pick the other half up. It is all ... Great White Shark Toy

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