A nurse shark (Ginglymostoma cirratum) with a fin camera attached to it caught some footage of 3m (10′) white shark (Carcharodon carcharias) off the coast of Florida’s Boynton Beach according to the USA Today video above and a report from Florida’s News Channel 8.
The camera equipped tag, which was deployed on the nurse shark by researchers from Florida Atlantic University, was initially thought to be lost after it stopped pinged. However, it was recovered days later after which the camera footage was reviewed, which revealed the exciting surprise cameo from the white shark.
According the BBC, a white shark (Carcharodon carcharias) was filmed off the coast of Mallorca, Spain near the Cabrera archipelago. While white sharks are known to inhabit the Mediterranean, they aren’t caught on camera particularly often. According to the BCC, this is the first confirmed sighting in the Balearic Islands since 1976.
As part of Georgina Harwood’s 100th birthday celebration, she went on a great white shark dive off Gansbai, South Africa, yesterday. In addition to the shark dive, Harwood also celebrated turning 100 with a skydive two days earlier. Harwood, a great-grandmother, began skydiving when she was 92, but this was her first shark dive.
Her recent skydive was done, in part, to help raise money to buy life-jackets for volunteers at South Africa’s National Sea Rescue Institute, according to a HuffPost UK article.
If you’d like to donate to Harwood’s life-jacket fundraiser, you can do so here.
The catch and release of a young great white shark (Carcharodon carcharias) off of a Florida beach near Panama City has been making headlines for the past few days. According to a photo on Dark Side Sharker’s Facebook page, fisherman Derrick Keeny landed the shark on March 1, 2015. The male white shark measured 9’8″ and is believed to be the first of its species to be landed from a beach in the Gulf of Mexico. The fisherman tagged the shark as part of the NOAA/NMFS Cooperative Tagging Plan and released it back into the ocean.
While the fishermen involved in the catch seemed to be well-intentioned with the tagging and release of the shark. Some shark researchers and conservationists called into question the legality of bringing the shark up onto the beach and posing for pictures, which is in violation of Florida’s protected species regulations, which specifically prohibit delaying the release of the shark for measurements and photos. It has yet to be reported whether the fishermen involved will be subjected to any legal repercussions.
The Australian Museum recently received a new intact goblin shark (Mitsukurina owstoni) specimen. The specimen is that of a young male and measures 1.26m in length. The shark was caught off Eden, New South Wales in water that was “several hundred meters deep.” This marks the fourth goblin shark in the museum’s Ichthyology Collection.
The goblin shark is a deep-water species that is rarely encountered by humans. It is known for its rather unconventional appearance, which includes pink skin, a flattened snout, and a jaw that can extend forward to capture prey. Adult goblin sharks are thought to typically reach lengths between 3-4m. Though, a specimen caught Gulf of Mexico in 2000 was estimated to be between 5.4 and 6.2m.
A recent study indicates great white sharks growth rates are much slower than previously thought.
Great white sharks (Carcharodon carcharias) grow and reach sexual maturity at much slower rates than previously believed, according to a press release from NOAA Fisheries. A study completed in 2014 and published online last month in the journal of Marine & Freshwater Research used carbon-14 dating and vertebral band pair counts of 81 white shark specimens, collected in the western North Atlantic Ocean, to develop a growth curve for the species. According to the results, female white sharks reach sexual maturity at approximately 33 years of age, while males reach maturity at approximately 26 years. Additionally, the results of the study indicate that the life-span of white sharks could exceed 70 years, which places them among one of the longest living species of fish.
The latest findings on the growth rates and life-span of white sharks provides important information for conservation efforts of the species. Low reproduction rates coupled with slow growth and maturation rates could potentially put the species at greater risk for population decline, since losses in populations are not quickly replaced. Great white sharks are a protected species in U.S. waters and legally must be released live, if captured. However, individual white sharks are sometimes killed as a result of incidental by-catch from commercial fisheries, so it is important that these types of incidents be managed to protect the welfare of white shark populations, as a whole.
For more information, check out NOAA Northeast Fisheries Science Center press release,
Predators are highly influential in ecosystems because of the many top-down effects they can have. The most obvious and direct way predators influence an ecosystem is by eating and reducing the number of prey animals in the system, but another equally important way is the indirect influence they have on the behaviour of prey animals.
If you have avoided parking on a risky-looking street, taken a different route between classes to avoid a bully, or abandoned a forest hike because of snapping twigs in the distance, you have been indirectly affected by perceived ‘predators’. In the wild, prey animals will also change their behaviour when they perceive that predators are around, and these altered behaviours often influence other species, ultimately shaping the ecosystem.
My research has focused on these same principles of predator/prey interactions in the ocean, and a great place to study oceanic predators and their prey are Cape fur seal colonies in South Africa. Every summer (November), Cape fur seals give birth to thousands of pups, and by winter (April – September) these ‘young-of-the-year’ seals begin to venture off their islands to swim offshore to the fishing grounds with the adults. These young-of-the-years are typically slow, plump from months of a mostly fat milk diet, and – most importantly – naïve. White sharks take advantage of this naivety and aggregate around seal colonies every winter. Young-of-the-year pups are forced to learn how to avoid sharks quickly or suffer some rather permanent consequences. This means that during a full year, every seal colony goes through a period of high white shark presence (winter) and very low to no white shark presence (summer). Therefore, we are able to study how seals act ‘normally’ during the summer when there are no/very few sharks and how they change their behaviour in the winter to avoid white sharks.
Also, there are many different kinds of seal colony islands along the coast, which lets us ask more questions about how seals use their environment to avoid sharks. I conducted my study at the Dyer Island/Geyser Rock system, which is home to ‘Shark Alley’ as well as many shallow reefs, kelp forests, and shipwrecks. About 100km to the east is another seal colony called Seal Island, which is a world-famous spot to see white sharks predate on seals, but this island system lacks the abundant nearby structures/reefs/kelp forests that are present at Geyser Rock. By looking at these two different kinds of islands, we can also examine how structures – or ‘refugia’ – may alter how seals avoid white sharks at Geyser Rock from how seals avoid white sharks at Seal Island.
Do all of these structures and anti-predatory tactics of Cape fur seals change white shark movements around Geyser Rock? Most definitely! Check out that study and infographic!
For viewers looking for an alternative to Discovery’s Shark Week, NatGeo Wild will be airing its own week of shark programming. Sharkfest promises “no fuss, no muss, just killer episodes.” Critics of some the programming of Discovery’s Shark Week, which include a follow-up to the faux documentary exploring the theory that the extinct C. Megalodon might still roam today’s ocean, might find Sharkfest’s programming choices to be a refreshing change of pace.
According to a report by Emirates 24/4, The United Arab Emirates (UAE) has issued a measure to ban shark finning. In addition to the ban on finning, the measure will also make it illegal to hunt sharks within 5 nautical miles of the UAE shores and 3 nautical miles of from the shores of UAE’s islands.
The measure was issued by UAE Minister of Environment and Water, Rashid bin Fahd. It will be enforced beginning September 1, 2014.
“Great White Ambush,” this week’s episode of National Geographic Channel’s “Die Trying,” will follow a team of shark experts, along with wildlife filmmaker Andy Casagrande to Shark Alley off the coast of Gansbaai, South Africa. The team’s goal is to capture a white shark (Carcharodon carcharias) in hopes of mounting data loggers and camera tags on the back of the shark, in order to scientifically document the complete profile of a breaching great white for the first time ever.
