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Scalloped hammerhead sharks are moderately large sharks with a global distribution. Hammerhead Shark in Costa Rican Waters Awakens Alarm Due to Possible Population... 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Front. Life-history traits inform population trends when assessing the conservation status of a declining tiger shark population… Scalloped hammerhead sharks are listed under the EPBC Act, the piece of Australian law that governs how we protect endangered wildlife from threats. Because of this, protecting young individuals is key to the conservation of the species, explained Jorge Arturo Jiménez, director of the Marviva organization. The Great Hammerhead Shark (Sphyrna mokarran) has been listed as a Vulnerable Species, and the Scalloped Hammerhead Shark (Sphyrna lewini) has been listed as an Endangered Species in NSW under the Fisheries Management Act 1994. Hammerhead shark species S. zygaena and S. lewini were found to It is overfished during all stages of its lifecycle. “Costa Rica must immediately prohibit the capture and retention of the hammerhead shark, as well as the domestic possession and commercialization of its parts if the country sincerely wants to save this emblematic species from its imminent extinction,” said Arauz. Commercial fishing is the biggest threat to hammerheads, with 370t of hammerhead sharks legally allowed to be caught every year in Australian waters (1). The hammerhead sharks are a group of sharks that form the family Sphyrnidae, so named for the unusual and distinctive structure of their heads, which are flattened and laterally extended into a "hammer" shape called a cephalofoil. Christine C. Bruels . This means there is limited information on the actual number of each of these threatened species caught in Australian waters. Keywords: scalloped hammerhead shark, population structure, genetic diversity, kinship analyses, SNPs. Until a week ago, the export of hammerhead sharks was allowed in Costa Rica, despite being an endangered species. The capture of the domestic market is allowed with certain restrictions for the longline sector. The information suggests possible overfishing of these animals, said Fins Attached biologist Randall Arauz. The opening of the Costa Rican air border to all the countries of the world starting this Sunday - three weeks before the start of the high season - is accompanied by a vertiginous interest of the airlines for the destination, If a few years ago someone had told us that women would occupy high positions in companies and that they would even start their own businesses. Many, but not necessarily mutually exclusive, functions have been postulated for the cephalofoil, including sensory reception, manoeuvering, and prey manipulation… It is found in tropical and warm temperate waters worldwide, inhabiting coastal areas and the continental shelf. Genetic diversity (θ), effective population size (N e), and contemporary levels of gene flow are important parameters to estimate for species of conservation concern, such as the globally endangered scalloped hammerhead shark, Sphyrna lewini.Therefore, we have reconstructed the demographic history of S. lewini across its Eastern Pacific (EP) range by applying classical and … Great and smooth hammerheads have no protection under the EPBC Act and are not listed to date. Under this category, 78 tonnes of hammerhead sharks can be caught in the Great Barrier Reef, the largest catch of the species anywhere around Australia. We can’t do this without you! Closed-area models highlight priority areas for shark conservation, and the need to consider effort reallocation and site selection if marine reserves are to benefit multiple threatened species. Most hammerhead species are placed in the genus Sphyrna, while the winghead shark is placed in its own genus, Eusphyra. A recent study by the University of Costa Rica (UCR) showed the “impact of fishing in national waters”: the diversity and quantity of sharks decrease drastically in fishing areas, but increases in protected areas. Scalloped hammerhead, white, and thresher sharks are each estimated to have declined by over 75% in the past 15 years. Don\\\'t forget to follow @theCRNews on instagram! Two distinct The Great Hammerhead (Sphyrna mokarran) is listed as Endangered with a decreasing population. Like humans, hammerhead sharks are long-lived, reach maturity after several years, and have few babies. This practice affects many different shark species, including whale sharks. population declines seen in hammerhead sharks are caus-ally related. Shark populations off Australia’s east coast have plummeted in the past 55 years, with new research finding species like great whites and hammerheads are closer to extinction than ever before. Australian hammerhead shark populations are in decline. These methods are outdated and ineffective – in 2006 a fatal shark bite occurred on a drumlined beach in Amity Point, QLD (7). Bruno L. S. Ferrette . So we decided to focus on news that’s important to people. This, however, does not always happen. The trade in these species is regulated by the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) convention. That is, out of every thousand hooks cast, how many sharks are caught. Scalloped Hammerhead Shark (Sphyrna lewini) – Population have declined by roughly 95% January 27, 2018 Most Endangered 3,533 Views Scalloped hammerheads sharks are among the most threatened highly migratory sharks. Hammerhead sharks are particularly vulnerable to being caught in gillnets (fishing nets) because of the unique shape of their head. You have entered an incorrect email address! The unique ‘hammer’ shaped head helps the shark zone in on prey by detecting the direction of a scent, and enabling it to see prey both above and below at the same time. Many fishery reports have historically only reported the number of ‘hammerheads’ caught, rather than giving the numbers of each species caught. We study the population dynamics of sharks through quantitative demographic methods and assess the status of shark stocks through a variety of stock assessment methodologies. They are The great hammerhead (Sphyrna mokarran) is the largest species of hammerhead shark. 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