En diciembre de 2021 se desarrolló la primera expedición a los montes submarinos las dorsales Malpelo y Yuruparí. total exploraron ocho por medio BRUVS (Baited Remote Underwater Video Systems). Se desplegaron 48 BRUVS, registrando cinco especies pelágicas (Sphyrna lewini, Mobula birostris, Pteroplatytrygon violácea, Kajikia audax Istiophorus platypterus), donde violácea constituyó un nuevo regi...

The peculiar head morphology of hammerhead sharks has spawned a variety of untested functional hypotheses. One of the most intuitively appealing ideas is that the anterior foil acts, as in canard-winged aircraft, to increase maneuverability. We tested this hypothesis by determining whether juveniles of two hammerhead species (Sphyrna tiburo and S. lewini) turn more sharply, more often, and with...

This paper presents size structure by sex and length-length relationships for Carcharhinus falciformis Sphyrna lewini caught an artisanal fishery in the Gulf of Tehuantepec, Mexico. According to a local processing practice this fishery, when sharks are landed, their jaws removed but not heads. The orbit-fork length was evaluated as basis estimating total length. A good fit (r2 > 0.9) linear ...

Scalloped hammerheads (Sphyrna lewini) occur in tropical to subtropical waters across all ocean basins and are globally assessed as Critically Endangered by the International Union for Conservation of Nature. In Australia, scalloped range from Sydney, New South Wales (34° S; 151° E), around northern down Geographe Bay, Western Australia (33° 115° E). However, species has rarely been recorded so...

BACKGROUND The scalloped hammerhead shark, Sphyrna lewini, is a large endangered predator with a circumglobal distribution, observed in the open ocean but linked ontogenetically to coastal embayments for parturition and juvenile development. A previous survey of maternal (mtDNA) markers demonstrated strong genetic partitioning overall (global Φ(ST) = 0.749) and significant population separation...

The northwestern Indian Ocean harbors a number of larger marine vertebrate taxa that warrant the investigation of genetic population structure given remarkable spatial heterogeneity in biological characteristics such as distribution, behavior, and morphology. Here, we investigate the genetic population structure of four commercially exploited shark species with different biological characterist...

Conservation and management of migratory species can be complex and challenging. International agreements such as the Convention on Migratory Species (CMS) provide policy frameworks, but assessments and management can be hampered by lack of data and tractable mechanisms to integrate disparate datasets. An assessment of scalloped (Sphyrna lewini) and great (Sphyrna mokarran) hammerhead populatio...