Results 11 to 20 of about 458 (119)

Examining the efficacy of a sanctuary to protect sharks in the Galapagos Marine Reserve

Conservation Science and Practice
In 2016, Ecuador established a no‐take marine sanctuary in the northern portion of the Galapagos Marine Reserve (GMR), ostensibly to protect sharks. Arguably because of this, experimental longlining was permitted in the rest of the reserve as part of a ...
Leah R. Gerber, Alex R. Hearn, Camila Guerrero Pineda, E. Paola Sangolquí   +3 more
doaj   +2 more sources

Preliminary assessment of the ecological sustainability of a data‐limited small‐scale shark fishery in India

Conservation Science and Practice
Small‐scale fisheries support millions of people globally, but if poorly monitored and managed, they can negatively impact threatened marine species like sharks.
Trisha Gupta, William N. S. Arlidge, Divya Karnad, Avanthika Kamath, Harsha Gaonkar, E. J. Milner Gulland   +5 more
doaj   +2 more sources

A Comparison of DNA Metabarcoding Cloacal Swabs and Stomach Contents for Shark Diet Reconstruction

Environmental DNA
Metabarcoding fecal matter is increasingly common in dietary studies across a variety of taxa. This approach assumes that enough prey DNA remains detectable in the fecal DNA (fDNA) as the prey DNA becomes degraded while passing through the digestive ...
Savannah J. Ryburn, Eldridge Wisely, Jeffrey D. Plumlee, Creed C. Branham, F. Joel Fodrie, John F. Bruno   +5 more
doaj   +2 more sources

Insights into the structure of grey reef shark aggregation, Carcharhinus amblyrhynchos (Bleeker, 1856), in two distinct channels of the Maldivian archipelago, Indian Ocean. [PDF]

J Fish Biol
Abstract The grey reef shark Carcharhinus amblyrhynchos is one of the most frequently encountered reef‐associated shark species in the Maldives, yet very little is known about its local size structure or population dynamics. This study provides new insights into two aggregations of C.
Parmegiani A, Gobbato J, Yoosuf R, Seveso D, Galli P, Whitehead AD, Ismail Y, Montano S.   +7 more
europepmc   +2 more sources

The Phenomenon of Piebaldism in Sharks: A Review of Global Sightings and Patterns. [PDF]

Ecol Evol
Chromatic disorders like piebaldism—a rare form of leucism causing partial pigment loss—have been documented in 25 wild shark cases across 17 species and 11 families, with varying anatomical distribution. This study compiles published and unpublished records to better understand the taxonomic and geographical spread of piebaldism and its potential ...
Whitehead DA, Parmegiani A, Gobbato J, Mizyan M, Askin A, Scroglieri S, Galli P, Seveso D, Montano S, Gayford JH.   +9 more
europepmc   +2 more sources

Potential metabolic records in isotope signals of chondrichthyan hard tissues. [PDF]

J Fish Biol
Abstract Recent advances have demonstrated that the field metabolic rates (FMRs) of teleost fishes can be quantified from stable isotope compositions of carbonate‐biomineralized otoliths. Bones and teeth, in addition to bioapatite, contain carbonate and should retain a similar isotopic expression of metabolic rate.
Díaz-Delgado E, Chung MT, Magozzi S, Willis TJ, Trueman CN.   +4 more
europepmc   +2 more sources

A blacktip's black tip: The reliability of using dorsal-fin patterns for photo identification of blacktip reef sharks (Carcharhinus melanopterus). [PDF]

J Fish Biol
Abstract Photo identification (photo ID) has increasingly become a valuable technique serving not only to identify individual animals but also to monitor populations, track migration patterns and assess wildlife health, among others uses. Various species of sharks are amenable to photo ID, among which the blacktip reef shark (Carcharhinus melanopterus)
Lionnet LAMG, Debaere SF, Heuls H, Mourier J, Planes S, Rummer JL.   +5 more
europepmc   +2 more sources

Albinismo parcial en un embrión de tiburón puntas negras, Carcharhinus limbatus (Carcharhinidae: Chondrichthyes) del Pacífico oriental

Latin American Journal of Aquatic Research, 2015
Se reporta el albinismo parcial de un embrión macho de tiburón de puntas negras, Carcharhinus limbatus, capturado en aguas costeras mexicanas del Pacífico oriental.
Francisco Sancho-Vazquez, Luis Fernando Del Moral-Flores, Oscar Uriel Mendoza-Vargas   +2 more
doaj   +1 more source

Secondary predation constrains DNA-based diet reconstruction in two threatened shark species

Scientific Reports, 2021
Increasing fishing effort, including bycatch and discard practices, are impacting marine biodiversity, particularly among slow-to-reproduce taxa such as elasmobranchs, and specifically sharks. While some fisheries involving sharks are sustainably managed,
Mark de Bruyn, Matteo Barbato, Joseph D. DiBattista, Matt K. Broadhurst   +3 more
doaj   +1 more source

In Situ Thrust Measurement of Fish During Locomotion; Test Case: Sharks. [PDF]

Ecol Evol
We present a novel method that uses in situ video data of fish locomotion to calculate thrust. This methodology was applied to several large elasmobranch species, which are typically challenging to measure. Our findings indicate that coastal pelagic species exhibited lower scaled thrust than benthic species, suggesting that benthic species may be less ...
Payne B, Keller BA, Weihs D, Gurka R.
europepmc   +2 more sources