Sea turtles, sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira. The seven existing species of sea turtles are the flatback, green, hawksbill, leatherback, loggerhead, Kemp's ridley, and olive ridley. Six of the seven sea turtle species, all but the flatback, are present in U.S. waters, and are listed as endangered and/or threatened under the Endangered Species Act. All but the flatback turtle are listed as threatened with extinction globally on the IUCN Red List of Threatened Species. The flatback turtle is found only in the waters of Australia, Papua New Guinea, and Indonesia.
Cheloniidae is a family of typically large marine turtles that are characterised by their common traits such as, having a flat streamlined wide and rounded shell and almost paddle-like flippers for their forelimbs. They are the only sea turtles to have stronger front limbs than back limbs. The six species that make up this family are: the green sea turtle, loggerhead sea turtle, olive ridley sea turtle, hawksbill sea turtle, flatback sea turtle and the Kemp's ridley sea turtle.
The leatherback sea turtle, sometimes called the lute turtle, leathery turtle or simply the luth, is the largest of all living turtles and the heaviest non-crocodilian reptile, reaching lengths of up to 2.7 metres and weights of 500 kilograms (1,100 lb). It is the only living species in the genus Dermochelys and family Dermochelyidae. It can easily be differentiated from other modern sea turtles by its lack of a bony shell; instead, its carapace is covered by oily flesh and flexible, leather-like skin, for which it is named. Leatherback turtles have a global range, although there are multiple distinct subpopulations. The species as a whole is considered vulnerable, and some of its subpopulations are critically endangered.
Bycatch, in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juveniles of the target species. The term "bycatch" is also sometimes used for untargeted catch in other forms of animal harvesting or collecting. Non-marine species that are caught but regarded as generally "undesirable" are referred to as rough fish or coarse fish.
The olive ridley sea turtle, also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae. The species is the second-smallest and most abundant of all sea turtles found in the world. L. olivacea is found in warm and tropical waters, primarily in the Pacific and Indian Oceans, but also in the warm waters of the Atlantic Ocean.
The loggerhead sea turtle is a species of oceanic turtle distributed throughout the world. It is a marine reptile, belonging to the family Cheloniidae. The average loggerhead measures around 90 cm (35 in) in carapace length when fully grown. The adult loggerhead sea turtle weighs approximately 135 kg (298 lb), with the largest specimens weighing in at more than 450 kg (1,000 lb). The skin ranges from yellow to brown in color, and the shell is typically reddish brown. No external differences in sex are seen until the turtle becomes an adult, the most obvious difference being the adult males have thicker tails and shorter plastrons than the females.
Kemp's ridley sea turtle, also called the Atlantic ridley sea turtle, is the rarest species of sea turtle and is the world's most endangered species of sea turtle. It is one of two living species in the genus Lepidochelys. The species primarily occupies habitat around the Gulf of Mexico though their migrations into the Atlantic are being affected by rising temperatures. Kemp's ridley sea turtles are currently listed as endangered under the Endangered Species Act (ESA), and current conservation efforts attempt to rebuild population numbers. Human activity, including but not limited to habitat destruction, climate change, and oil spills, threaten populations.
The green sea turtle, also known as the green turtle, black (sea) turtle or Pacific green turtle, is a species of large sea turtle of the family Cheloniidae. It is the only species in the genus Chelonia. Its range extends throughout tropical and subtropical seas around the world, with two distinct populations in the Atlantic and Pacific Oceans, but it is also found in the Indian Ocean. The common name refers to the usually green fat found beneath its carapace, due to its diet strictly being seagrass, not to the color of its carapace, which is olive to black.
The Australian flatback sea turtle is a species of sea turtle in the family Cheloniidae. The species is endemic to the sandy beaches and shallow coastal waters of the Australian continental shelf. This turtle gets its common name from the fact that its shell has a flattened or lower dome than the other sea turtles. It can be olive green to grey with a cream underside. It averages from 76 to 96 cm in carapace length and can weigh from 70 to 90 kg. The hatchlings, when emerging from nests, are larger than other sea turtle hatchlings when they hatch.
Ghost nets are fishing nets that have been abandoned, lost, or otherwise discarded in the ocean, lakes, and rivers. These nets, often nearly invisible in the dim light, can be left tangled on a rocky reef or drifting in the open sea. They can entangle fish, dolphins, sea turtles, sharks, dugongs, crocodiles, seabirds, crabs, and other creatures, including the occasional human diver. Acting as designed, the nets restrict movement, causing starvation, laceration and infection, and suffocation in those that need to return to the surface to breathe. It's estimated that around 48 million tons of lost fishing gear is generated each year, not including those that were abandoned or discarded and these may linger in the oceans for a considerable time before breaking-up.
Gahirmatha Beach is a beach in Kendrapara district of the Indian state of Odisha. The beach separates the Bhitarkanika Mangroves from the Bay of Bengal and is the world's most important nesting beach for olive ridley sea turtles. The beach is part of Gahirmatha Marine Wildlife Sanctuary, which also includes the adjacent portion of the Bay of Bengal.
The Sea Turtle Restoration Project (STRP), founded in 1989, is a project of Turtle Island Restoration Network (TIRN), a United States 501(c)(3) nonprofit environmental organization with a goal of protecting endangered sea turtles from human-caused threats at nesting beaches and in the ocean.
The Memorandum of Understanding (MoU) concerning Conservation Measures for Marine Turtles of the Atlantic Coast of Africa is a 1998 multilateral environmental memorandum of understanding that entered into effect on 1 July 1999 under the auspices of the Convention on Migratory Species of Wild Animals (CMS), also known as the Bonn Convention. The MoU focuses on the protection of six marine turtle species that are estimated to have rapidly declined in numbers along the Atlantic Coast of Africa. The MoU covers 26 range States. As of May 2013, 23 range States have signed the MoU.
The hawksbill sea turtle is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus Eretmochelys. The species has a global distribution that is largely limited to tropical and subtropical marine and estuary ecosystems.
Watamu Marine National Park and Reserve is located in Kenya. Established in 1968, it was one of Kenya's first marine parks. It is located about 90 miles (140 km) north of Mombasa, Kenya's second largest city. Its coral gardens are 300 metres (980 ft) from the shore and are home to approximately 600 species of fish, 110 species of stony coral and countless invertebrates, crustaceans and molluscs. Water temperature varies from 20 degrees Celsius to 30 degrees Celsius. The park was designated as a biosphere reserve in 1979.
João Vieira and Poilão Marine National Park is a national park in Guinea-Bissau. It was established in August 2000. It covers an area of 495.0 square kilometres (191.1 sq mi) and includes the uninhabited islands of João Vieira, Cavalos, Meio and Poilão, in the southeastern part of the Bijagós Archipelago. The beaches of the islands are frequented by the sea turtle species Chelonia mydas, Eretmochelys imbricata and Lepidochelys olivacea.
Threats to sea turtles are numerous and have caused many sea turtle species to be endangered. Of the seven extant species of sea turtles, six in the family Cheloniidae and one in the family Dermochelyidae, all are listed on the IUCN Red List of Endangered Species. The list classifies six species of sea turtle as "threatened", two of them as "critically endangered", one as "endangered" and three as "vulnerable". The flatback sea turtle is classified as "data deficient" which means that there is insufficient information available for a proper assessment of conservation status. Although sea turtles usually lay around one hundred eggs at a time, on average only one of the eggs from the nest will survive to adulthood. While many of the things that endanger these hatchlings are natural, such as predators including sharks, raccoons, foxes, and seagulls, many new threats to the sea turtle species are anthropogenic.
Worldwide, hundreds of thousands of sea turtles a year are accidentally caught in shrimp trawl nets, on longline hooks and in fishing gill-nets. Sea turtles need to reach the surface to breathe, and therefore many drown once caught. Loggerhead and hawksbill turtles are particularly vulnerable. Nearly all species of sea turtle are classified as Endangered. They are killed for their eggs, meat, skin and shells. They also face habitat destruction. Climate change has an impact on turtle nesting sites. As fishing activity expands, this threat is more of a problem.
The Dolphin Nature Conservation Society (DNCS) is a registered voluntary environmental non-profit and non-governmental organization (NGO) located in Visakhapatnam, Andhra Pradesh, India. It is committed to the causes of nature conservation, environmental protection, research, education, and awareness. The society was founded on March 5, 2001, by Dr. Mantha Rama Murty and Dr. Mangathayi, who had previously launched several nature conservation programs in Andhra Pradesh, particularly in Visakhapatnam. The organization's activities are intended to instill a love for nature and conservation among people, especially among the younger generation. Notable research, documentation, conservation, and awareness campaigns of the society have involved Olive-Ridley Sea Turtles, intertidal rocky shore fauna and flora of the Visakhapatnam coast, and butterflies of the Eastern Ghats. The society's flagship project is the development and maintenance of the Biodiversity Park in Visakhapatnam.
