According to a Herald Sun article, great white sharks (Carcharodon carcharias) are fans of the Australian rock band AC/DC. At least, that’s what Adventure Bay Charter’s Matt Wallace told the Herald Sun.
Wallace takes cage divers out several times a week south of Port Lincoln, Australia to view great white sharks. He says that the sharks seem to prefer the “low frequency” music of AC/DC to other music. Wallace asked researchers about sound that would attract white sharks. He said he was told that the species responds best to frequencies below 200 Hertz.
Wallace used “trial and error” to come to his conclusion that AC/DC was the preferred band for the predatory fish.
LiveScience is reporting that scientists, with the support of the NSF have developed a fishing hook designed to reduce the accidental catch of sharks from commercial fishing. Developers incorporated “magnetic repellent” and “galvanic repellent” into the design of the hooks to “interfere” with sharks’ ampullae of Lorenzini, which are electroreceptors not found in “market-valuable” fish such as tuna.
These new hooks, called SMART (Selective Magnetic and Repellent-Treated Hook) hooks, were shown to reduce shark catch by 18 percent to 68 percent, depending on the species involved and geographic location, when compared to traditional hooks.
On a related note, GIZMODO, re-ran the LiveScience story with the following headline, “New Shark-Repellant Fishing Hook Leaves More Sharks in the Water to Eat People.”
The video above, shot by Darren Marshall, was recently posted to AKSinWA’s YouTube channel. According to the video, which was shot in Western Australia, a young humpback whale (Megaptera novaeangliae) died after becoming trapped on a reef.
According to the information in the video, two 8′ tiger sharks (Galeocerdo cuvier) began feeding on the whale within minutes after its death. Within 45 minutes, the number of sharks had risen to approximately 30. The video also notes that bronze whaler sharks (Carcharhinus brachyurus) were also involved in the feeding event.
The sharks fed on the carcass for the next two days, leaving only skeletal remains behind when the feeding event ended.
In a case of “man bites shark,” The Palm Beach Post is reporting that beach visitors at a Lake Worth beach were greeted this morning by the sight of a shark which had apparently been reeled in and left gutted and beheaded on the beach. The shark’s head and innards left nearby the rest of the carcass along with multiple empty beer cans.
While beheading and gutting a catch is not unusual for fishermen, this is usually done to separate the inedible parts of a fish from the edible meat. In this particular case the entire shark was left on the beach, which would defeat the purpose of separating the meat of the shark from the head and entrails.
LiveScience.com is reporting that an August, 2009 aggregation of whale sharks (Rhincodon typus) off the Yucatán Peninsula numbered up to 420 whale sharks within a 7 square-mile area. While this whale shark aggregation had previously been reported in the past, yesterday scientists announced that they had tallied the number of the animals to be an estimated 420.
For the full article on the recent whale shark report, check out LiveScience.com.
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