Home » Archives
Shark tooth regeneration reveals common stem cell characters in both human rested lamina and ameloblastoma
Shark tooth regeneration reveals common stem cell characters in both human rested lamina and ameloblastoma Gareth J. Fraser, Samar S. Hamed, Kyle J. Martin, Keith D. Hunter ABSTRACT: The human dentition is a typical diphyodont mammalian system with tooth replacement of most positions. However, after dental replacement and sequential molar development, the dental lamina undergoes
Diet of longnose stingray in tropical coastal waters of Brazil
Diet of longnose stingray Hypanus guttatus (Myliobatiformes: Dasyatidae) in tropical coastal waters of Brazil Michel Donato Gianeti, Leandro Yokota, Rosangela Paula Teixeira Lessa, June Ferraz Dias ABSTRACT: This study investigated the diet of longnose stingray Hypanus guttatus in the tropical waters of north-eastern Brazil. Samples were obtained from monthly sampling of artisanal fisheries from August
Intra-oropharyngeal food transport and swallowing in white-spotted bamboo sharks
Intra-oropharyngeal food transport and swallowing in white-spotted bamboo sharks Noraly M. M. E. van Meer, Hannah I. Weller, Armita R. Manafzadeh, Elska B. Kaczmarek, Bradley Scott, Sander W. S. Gussekloo, Cheryl D. Wilga, Elizabeth L. Brainerd, Ariel L. Camp ABSTRACT: Despite the importance of intraoral food transport and swallowing, relatively few studies have examined the
First record of the ragged-tooth shark in the Venezuelan Caribbean
First record of the ragged-tooth shark, Odontaspis ferox (Risso, 1810), in the Venezuelan Caribbean Rafael Tavares, Leonardo Sanchez, Jose Manuel Briceño ABSTRACT: One specimen of the ragged-tooth shark, Odontaspis ferox, was caught by a commercial shark fishery to the north of Cape Codera (10° 56′ N, 66° 02′ W), northeastern Venezuela. The specimen (sex unidentified,
A new genus and species of catshark from eastern Indonesia
A new genus and species of catshark (Carcharhiniformes: Scyliorhinidae) from eastern Indonesia William T. White, Fahmi Fahmi, Simon Weigmann ABSTRACT: A new genus and species of catshark is described based on a single specimen collected off Ambon in the Maluku Islands of eastern Indonesia. Akheilos suwartanai belongs to the subfamily Schroederichthyinae which differs from the
First Reconstruction of Kinship in a Scalloped Hammerhead Shark Aggregation
First Reconstruction of Kinship in a Scalloped Hammerhead Shark Aggregation Reveals the Mating Patterns and Breeding Sex Ratio Amandine D. Marie, Christophe Herbinger, Philippe Fullsack, Ciro Rico ABSTRACT: Sharks constitute one of the most threatened clades (Selachimorpha) of all marine fish, and substantial management efforts are required to help the recovery of their populations worldwide.
Swordfish or Shark Slice? A Rapid Response by COIBar–RFLP
Swordfish or Shark Slice? A Rapid Response by COIBar–RFLP Venera Ferrito, Alessandra Raffa, Luana Rossitto, Concetta Federico, Salvatore Saccone, Anna Maria Pappalardo ABSTRACT: Market transparency is in strong demand by consumers, and the authentication of species is an important step for seafood traceability. In this study, a simple molecular strategy, COIBar–RFLP (cytochrome oxidase I barcode–restriction
Tiger shark predation on large ocean sunfishes
Tiger shark predation on large ocean sunfishes (Family Molidae) – two Australian observations Marianne Nyegaard, Samantha Andrzejaczek, Curt S. Jenner, Micheline-Nicole M. Jenner ABSTRACT: Sharks are commonly listed as predators of the large ocean sunfishes (genera Mola and Masturus), yet documented shark predation events on adult sunfish are exceedingly infrequent in the literature. Here we
New records of the Critically Endangered Ganges shark in Bangladeshi waters
New records of the Critically Endangered Ganges shark Glyphis gangeticus in Bangladeshi waters: urgent monitoring needed Alifa Bintha Haque, Sudipta Arka Das ABSTRACT: The different species of elasmobranch found in Bangladeshi fisheries and markets were quantified in a survey between February 2016 and November 2017. This resulted in records of the Critically Endangered Ganges shark
Age, growth, and maturation of the Finetooth Shark
Age, growth, and maturation of the Finetooth Shark, Carcharhinus isodon, in the Western North Atlantic Ocean Elizabeth A. Vinyard, Bryan S. Frazier, J. Marcus Drymon, James J. Gelsleichter, Walter J. Bubley ABSTRACT: Many elasmobranchs display K-selected life history characteristics, making species-specific life history parameters critical to development of the most accurate stock assessment models. Age,
Response of small sharks to nonlinear internal waves
Response of small sharks to nonlinear internal waves Jesús Pineda, Sally Rouse, Victoria Starczak, Karl Helfrich, David Wiley ABSTRACT: Plankton and nekton may respond passively or actively to large‐amplitude, nonlinear internal waves (NLIW), with periods and wavelengths on the order of minutes and hundreds of meters, and the NLIW can cause direct or indirect changes
Evidence for non-random co-occurrences in a white shark aggregation
Evidence for non-random co-occurrences in a white shark aggregation Adam Schilds, Johann Mourier, Charlie Huveneers, Leila Nazimi, Andrew Fox, Stephan T. Leu ABSTRACT: Groups or aggregations of animals can result from individuals being attracted to a common resource or because of synchronised patterns of daily or seasonal activity. Although mostly solitary throughout its distribution, white
Patterns in abundance and size of sharks in northwestern Australia
Patterns in abundance and size of sharks in northwestern Australia: cause for optimism Matias Braccini, Brett Molony, Nick Blay ABSTRACT: Reliable information for population assessments is rare for sharks. We quantified patterns in catch rates and mean size for numerous tropical and subtropical species from 15 years of fishery-independent surveys (2002–2017) in northwestern Australia. This
Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks
Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks Sphyrna lewini in the Eastern Tropical Pacific Seascape Zanella I, Lopez-Garro A, Cure K ABSTRACT: Scalloped hammerhead sharks Sphyrna lewini are endangered and threatened by fisheries. Along the Eastern Tropical Pacific Seascape (ETPS) adults are protected from fishing near oceanic islands, but juveniles
The size of the megatooth shark revisited
The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited Kenshu Shimada ABSTRACT: Otodus megalodon (Lamniformes: Otodontidae) is a gigantic late Neogene shark that lived nearly worldwide in tropical-temperate regions. Its gigantic teeth have captivated imaginations of the scientific community and general public alike, where the most commonly cited maximum size range of O.