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An estimate of the number of white sharks interacting with ecotourism in Guadalupe Island
An estimate of the number of white sharks Carcharodon carcharias interacting with ecotourism in Guadalupe Island Edgar E. Becerril‐García, Edgar M. Hoyos‐Padilla, Omar Santana‐Morales, Miguel A. Gutiérrez‐Ortiz, Arturo Ayala‐Bocos, Felipe Galván‐Magaña ABSTRACT: The aim of the present study is to provide an estimate of the number of white sharks Carcharodon carcharias that seasonally interact with
Reproductive cycle and fecundity of finetooth sharks from the Northwest Atlantic Ocean
Re‐evaluation of reproductive cycle and fecundity of finetooth sharks Carcharhinus isodon (Valenciennes 1839) from the Northwest Atlantic Ocean, with new observations on ovarian cycle and reproductive endocrinology of biennially reproducing sharks Amanda N. Brown, Bryan S. Frazier, Jim Gelsleichter ABSTRACT: To provide updated information on life history for improved fishery management, the reproductive cycle of
Spermatogenesis in mature male scalloped hammerhead sharks
A first observation of spermatogenesis in mature male scalloped hammerheads (Sphyrna lewini) from Zinkwazi, KwaZulu-Natal, South Africa Coetzee, H.J., Naidoo, K. & Wagenaar, I. ABSTRACT: Sharks are not only threatened, but also have a low fecundity as they are being overfished. The shark family, Sphyrnidae, consists of nine species of which three are found in
Using perceptions to examine human responses to blanket bans: The case of the thresher shark landing-ban in Sri Lanka
Using perceptions to examine human responses to blanket bans: The case of the thresher shark landing-ban in Sri Lanka Claire Collins, Tom Bech Letessier, Annette Broderick. Isuru Wijesundara, Ana Nuno ABSTRACT: Species-specific bans are increasingly being implemented to stem loss of vulnerable marine species, but there is a paucity of evaluative research into resulting socio-economic
Reproductive biology of two pelagic sharks in the eastern Atlantic Ocean
Aspects of the reproductive biology of two pelagic sharks in the eastern Atlantic Ocean Feng Wu, Richard Kindong, Xiaojie Dai, Ousmane Sarr, Jiangfeng Zhu, Siquan Tian, Yunkai Li, Bruno T. N. Nsangue ABSTRACT: This study used data provided by the Chinese Longline Fishery Scientific Observer Programme from the tropical eastern Atlantic Ocean to estimate the
Multiple Paternity in the Shortfin Mako Shark
Accessing Multiple Paternity in the Shortfin Mako Shark (Isurus oxyrinchus) Shang Yin Vanson Liu, Wen-Pei Tsai, Meng Shan Lee, Hsiu-Wen Chien ABSTRACT: Multiple paternity has been demonstrated in a variety of sharks with different reproductive modes (i.e., viviparous, ovoviviparous, adelphophagy, oviparous), although the number of sires per litter varies considerably among species. To date, such
The complete mitogenome of the Critically Endangered smalltooth sand tiger shark
The complete mitogenome of the Critically Endangered smalltooth sand tiger shark, Odontaspis ferox (Lamniformes: Odontaspididae) Noel Vella, Adriana Vella ABSTRACT: Here, we report the first complete mitochondrial genome for the smalltooth sand tiger shark, Odontaspis ferox (Risso, 1810). The circular mitochondrial genome was found to be 16,682 bp in length and contains 37 genes, a control
Body dimensions of the extinct giant shark Otodus megalodon
Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction Cooper J.A., Pimiento C., Ferrón H.G., Benton M.J. ABSTRACT: Inferring the size of extinct animals is fraught with danger, especially when they were much larger than their modern relatives. Such extrapolations are particularly risky when allometry is present. The extinct giant shark †Otodus megalodon
Urban manta rays
Urban manta rays: potential manta ray nursery habitat along a highly developed Florida coastline Jessica H. Pate, Andrea D. Marshall ABSTRACT: The giant oceanic manta ray Mobula birostris was listed in the US Endangered Species Act as a threatened species in 2018, yet insufficient data exist on manta populations throughout US waters to designate critical
A hydrodynamics assessment of the hammerhead shark cephalofoil
A hydrodynamics assessment of the hammerhead shark cephalofoil Matthew K. Gaylord, Eric L. Blades, Glenn R. Parsons ABSTRACT: Hammerhead sharks are characterized by a conspicuous lateral expansion of the head forming a structure known as a cephalofoil. Two theories regarding the function of this structure suggest that it may increase maneuverability as well as produce
Seasonal Movements and Habitat Use of Juvenile Smooth Hammerhead Sharks in the Western North Atlantic Ocean
Seasonal Movements and Habitat Use of Juvenile Smooth Hammerhead Sharks in the Western North Atlantic Ocean and Significance for Management Ryan K. Logan, Jeremy J. Vaudo, Lara L. Sousa, Mark Sampson, Bradley M. Wetherbee, Mahmood S. Shivji ABSTRACT: Upper trophic level predators dramatically impacted by fisheries include the large-bodied hammerhead sharks, which have become species
First confirmed record of the occurrence of the lesser devil ray in the southwestern Gulf of Mexico
First confirmed record of the occurrence of the lesser devil ray, Mobula hypostoma (Elasmobranchii, Mobulidae), in the southwestern Gulf of Mexico Luis Fernando Del Moral-Flores, Itzel Meza-Abundio, Horacio Pérez-España ABSTRACT: Nine specimens (one female and eight males, all juveniles) of lesser devil ray, Mobula hypostoma (Bancroft, 1831), were caught in the southwest Gulf of Mexico.
The presence of Bull shark in the fresh waters of Sumatra
Short Communication: The presence of Bull shark Carcharhinus leucas (Elasmobranchii: Carcharhinidae) in the fresh waters of Sumatra, Indonesia Hasan V, Widodo MS. ABSTRACT: A single subadult specimen of Bull shark Carcharhinus leucas was photographed and captured by local fisherman using casting net on June 2020 in the upper Indragiri River, Riau Province, Indonesia. Carcharhinus leucas
Social media: a valuable tool to inform shark conservation in Greece
Social media: a valuable tool to inform shark conservation in Greece Taklis C., Giovos I., Karamanlidis A. ABSTRACT: Sharks in the Mediterranean Sea are facing an elevated risk of extinction; several species are considered endangered and some have been reduced to such low population numbers that they are hard to detect through conventional monitoring methods.
Shark discards in selective and mixed-species pelagic longline fisheries
Shark discards in selective and mixed-species pelagic longline fisheries Gareth L. Jordaan, Jorge Santos, Johan C. Groeneveld ABSTRACT: The conservation status of several pelagic shark species is considered vulnerable with declining populations, yet data on shark fishing mortality remain limited for large ocean regions. Pelagic sharks are increasingly retained by mixed-species fisheries, or are discarded