Kaneohe bay, oahu, is a pupping ground for the scalloped hammerhead shark, sphyrna lewini, the pups being most abundant between april and october. Diet and trophic level of scalloped hammerhead shark sphyrna lewini from the gulf of california and gulf of tehuantepec, mexico article pdf available in iranian journal of fisheries sciences. Common and scientific names of fishes from the united states, canada, and mexico. During a routine survey, the scalloped hammerhead shark, sphyrna lewini was caught from nagapattinam coastal waters, southeast coast of india. Each species, however, has a slightly different shape to their head and other body. Diet was also analyzed using seven broad diet categories dc. The fisheries scientific committee, established under part 7a of the fisheries management act 1994 the act, is proposing to list the scalloped hammerhead shark, sphyrna lewini as an endangered species in part 1 of schedule 4 of. The greek word sphyrna translates into hammer in english, referring to the shape of this sharks head. Schooling in sphyrna lewini, a species with low risk of predation. The most distinguishing characteristic of this shark, as in all hammerheads, is the hammer. Measurements of the sizes of juveniles caught in nets close to shore and those swimming in schools at seamounts and islands in the southwestern gulf of california, mexico indicate that at least part of the population undergoes a migration during their life cycle at a. Sphyrna simple english wikipedia, the free encyclopedia. Age and growth of the scalloped hammerhead shark, sphyrna lewini, in the northwest atlantic ocean and gulf of mexico. Age and growth of the scalloped hammerhead, sphyrna lewini.
Hamish tristram1, severine thomas1, 2, lyle squire jnr2, 3. Shark, sphyrna lewini, gulf of tehuantepec, mexico. Diet and diel feeding periodicity of juvenile scalloped hammerhead sharks, sphyrna lewini, in ka. They are known to form large migratory schools and in. Therefore, we have reconstructed the demographic history of s. The scalloped hammerhead shark is one of about 10 different species of related hammerhead sharks. The following file is a searchable version of part 1 scientific name, occurre nce, and accepted common name from the 7th edition 20 of. A coastalpelagic, semioceanic shark occurring over continental and insular shelves and adjacent deep water, often approaching close inshore and entering enclosed bays and estuaries ref. Scalloped hammerhead sharks sphyrna lewini incorporate the contrasting traits of oceanic habitat usually associated with high dispersal. Pdf recurrence of scalloped hammerhead sphyrna lewini from. Hammerhead sharks belong to the order sphyrna, which is the greek word for hammer. Sphyrna is one of the two genera in the hammerhead shark group, and is the largest genera out of the two, with eight members in it. Recurrence of scalloped hammerhead sphyrna lewini from.
The scalloped hammerhead shark, sphyrna lewini griffith, 1834, is a viviparous high trophic level predator, circumglobally distributed in tropical and warm temperate waters over both, neritic and adjacent pelagic waters, with fecundities ranging from to 31 neonates of 4255 cm total length per litter after a gestation period of 910. Age and growth of the scalloped hammerhead, sphyrna lewini, caught mostly by longline and harpoon in northeastern taiwan waters from december 1984 to november 1985, were determined from annulus counts from 325. The ecology of the scalloped hammerhead shark, sphyrna lewini, in hawaiil. The ecology of the scalloped hammerhead shark, sphyrna. All structured data from the file and property namespaces is available under the creative commons cc0 license. This report was produced in response to a petition received from defenders of wildlife on april 27, 2015, to list the smooth hammerhead shark sphyrna zygaena as endangered or threatened under the endangered species act esa. Diet of scalloped hammerhead shark in eastern gulf of. Sphyrna lewini from the gulf of california and gulf of. This file does not include the following sections from the printed version of the book. Diel movements of scalloped hammerhead sharks, sphyrna lewini griffith and smith, to and from a seamount in the gulf of california. An sphyrna mokarran in uska species han elasmobranchii nga syahan ginhulagway ni ruppell hadton 1837. It has also been known as cestracion leeuwenii in 1865, zygaena erythraea in 1871, cestracion oceanica in 19, and sphyrna diplana in 1941. Alternatively, you can download the pdf file directly to your computer, from where it can be opened using a pdf reader. Parameter populasi hiu martil sphyrna lewini griffith.
Found in inshore and offshore waters to about 275 m depth ref. The determinants of sexual segregation in the scalloped hammerhead shark, sphyrna. Deepwater observation of scalloped hammerhead sphyrna. Status of the indian ocean scalloped hammerhead shark spl. Ginklasipika han iucn an species komo nangangaratan. The observation, which occurred during night hours, is the deepest accurately recorded for this species and the first deepwater record for the indian ocean. Its highly migratory nature, slow growth, and lengthy gestation period place this common bycatch species at risk to fishing practices on the high seas, at oceanic congregation sites. Originally known as zygaena lewini, its genus name was later changed to its current name. This file is licensed under the creative commons attributionshare alike 3. Age and growth of the scalloped hammerhead shark, sphyrna lewini.
Demographic processes underlying subtle patterns of. The scalloped hammerhead shark, sphyrna lewini griffith and smith 1834, is a circumtropical migratory species that uses both oceanic and coastal habitats for. The scalloped hammerhead shark is a coastal pelagic species with a circumglobal distribution in warm temperate and tropical coastal areas between 45n and 34s. Pdf scalloped hammerhead shark sphyrna lewini, utilizes deep. Juveniles of this species inhabit coastal waters, while adults are found in groups or as solitary individuals further offshore 8, 9. The growth rate and mortality of male sharks was higher than female.
In utero elemental tags in vertebrae of the scalloped hammerhead shark sphyrna lewini reveal migration patterns of pregnant females article pdf available in scientific reports 101 december. You may do so in any reasonable manner, but not in. The pdf file you selected should load here if your. Pdf during a routine survey, the scalloped hammerhead shark, sphyrna lewini was caught from nagapattinam coastal waters, southeast coast of india. Frontiers dna analysis of juvenile scalloped hammerhead.
Diet composition and estimated daily ration were compared to p. Juvenile scalloped hammerhead sharks, sphyrna lewini, were collected in northwest florida to examine foraging ecology, bioenergetics, and trophic level 3060 cm fl mean fl 41. This page was last edited on 18 december 2019, at 15. Husbandry of scalloped hammerhead sharks sphyrna lewini. In utero elemental tags in vertebrae of the scalloped. A coastalpelagic, semioceanic shark occurring over continental and insular shelves and adjacent deep water, often.
Pilot acoustic tracking study on young of the year scalloped hammerhead sharks, sphyrna lewini, within a coastal nursery area in jalisco, mexico. Media in category sphyrna lewini the following 49 files are in this category, out of 49 total. Scalloped hammerhead shark sphyrna lewini nsw department of. Scalloped hammerhead shark sphyrna lewini is a cir cumtropical species with moderate fecundity about 40 pups litter, compagno, 1984. The scalloped hammerhead sphyrna lewini is a species of hammerhead shark, and part of the family sphyrnidae. Scalloped hammerhead sphyrna lewini the world of animals. The scalloped hammerhead sphyrna lewini was the first shark species to be protected under the u. Little information exists on the vertical and horizontal movements of juvenile scalloped hammerhead sharks sphyrna lewini. Files are available under licenses specified on their description page. They sometimes congregate over sea mounts or around offshore islands. Pacific nondetriment finding template for the scalloped. I have characterized the population genetic structure, inferred the evolutionary processes shaping it, and estimated effective population size ne using different contemporary and coalescent methods in the endangered scalloped hammerhead shark, sphyrna lewini, throughout its. The width of hammer in this species is 2430% of total length.
An sphyrna mokarran in nahilalakip ha genus nga sphyrna, ngan familia nga sphyrnidae. The word sphyrna is a greek word meaning hammer, which refers to the shape of the sharks head. The ecology of the scalloped hammerhead shark, sphyrna lewini, in hawaii. Hammerhead sharks are easily identified by the hammer shape of their heads. Scalloped hammerhead simple english wikipedia, the free. Sphyrna lewini was capable of reaching 399 cm asymptotic length. Pdf diet and trophic level of scalloped hammerhead shark. Diet analysis was performed using single and compound measures of prey quantity. A scalloped hammerhead sphyrna lewini was observed opportunistically from a remotely operated vehicle 1 m off the seabed at 1042 m depth, during hydrocarbon exploration activities in the ruvuma basin off tanzania. It is the second time this species has occurred after a long period along the indian coast, and this substantiates the possibility of. The online guide to the animals of trinidad and tobago.
The scalloped hammerhead shark sphyrna lewini is a slowgrowing requiem shark with a circumglobal distribution, occurring in warm temperate and tropical seas. Ontogenetic migration of a female scalloped hammerhead. Biology viviparous, placental, with 23 in a litter. Extensive use of mesopelagic waters by a scalloped. Its coloration is brownish gray, shading to white on the underside. The population genetics of the endangered scalloped. Pdf a hammerhead shark sphyrna lewini tracked for 74 days revealed an expansion of the range of vertical distribution for the species to include the. Conservation and management efforts of marine apex predators are more reliable when information on movement and habitat use patterns are known. Sphyrna lewini is a circumglobal shark species native to coastal warm temperate and tropical seas. Fisheries ecosystems unit, port stephens fisheries institute. The ecology of the scalloped hammerhead shark, sphyrna lewini. Silvergray to graybrown, fading to white underside.