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Performance of Two Survey Gears Targeting Elasmobranchs
Performance of Two Survey Gears Targeting Elasmobranchs in a Shallow, Subtropical Estuary Grace Roskar, Michael P. McCallister, Matthew J. Ajemian ABSTRACT: Fishery‐independent surveys have become increasingly prevalent in recent decades for monitoring the population trends of highly mobile species like elasmobranchs (sharks and rays). Despite the utility of gear evaluations for streamlining costs and increasing
First study on age and growth of the deep-water Goblin Shark
First study on age and growth of the deep-water Goblin Shark, Mitsukurina owstoni (Jordan, 1898) Fabio P. Caltabellotta, Zachary A. Siders, Gregor Cailliet, Fabio S. Motta, Otto B. F. Gadig ABSTRACT: Due to poorly mineralizing structures, ageing deep-water elasmobranchs requires nonconventional techniques. The aim of the present study was to develop a reliable ageing technique
Tourism-driven ocean science for sustainable use: A case study of sharks in Fiji
Tourism-driven ocean science for sustainable use: A case study of sharks in Fiji C A Ward-Paige, J Brunnschweiler, H Sykes ABSTRACT: The oceans are in a state of rapid change – both negatively, due climate destabilization and misuse, and positively, due to strengthening of policies for sustainable use combined with momentum to grow the blue
Morphological deformities in the pelvic fin and clasper in Potamotrygon marquesi
Morphological deformities in the pelvic fin and clasper in specimens of Potamotrygon marquesi (Chondrichthyes: Myliobatiformes: Potamotrygoninae) João Paulo Capretz, Batista da Silva, André Luis da Silva Casas ABSTRACT: We report deformities in the pelvic fin and clasper skeleton in specimens of Potamotrygon marquesi from Acre, Northwestern Brazil. The malformations involve skeletal deformities in the pelvic
Diel patterns in swimming behavior of the bluntnose sixgill
Diel patterns in swimming behavior of a vertically migrating deepwater shark, the bluntnose sixgill (Hexanchus griseus) Daniel M. Coffey, Mark A. Royer, Carl G. Meyer, Kim N. Holland ABSTRACT: Diel vertical migration is a widespread behavioral phenomenon where organisms migrate through the water column and may modify behavior relative to changing environmental conditions based on
Multi-year patterns in scarring, survival and residency of whale sharks in Ningaloo Marine Park
Multi-year patterns in scarring, survival and residency of whale sharks in Ningaloo Marine Park, Western Australia Emily Lester, Mark G. Meekan, Peter Barnes, Holly Raudino, Dani Rob, Kelly Waples, Conrad W. Speed ABSTRACT: Documentation of scarring patterns on marine megafauna provides a means of quantifying the risk of anthropogenic threats that occur in the open
Field assessment of behavioural responses of southern stingrays to acoustic stimuli
Field assessment of behavioural responses of southern stingrays (Hypanus americanus) to acoustic stimuli Megan F. Mickle, Rachel H. Pieniazek, Dennis M. Higgs ABSTRACT: The ability of elasmobranchs to detect and use sound cues has been heavily debated in previous research and has only recently received revived attention. To properly understand the importance of sound to
Opportunities from citizen science for shark conservation
Opportunities from citizen science for shark conservation, with a focus on the Mediterranean Sea F. Bargnesi, S. Lucrezi, F. Ferretti ABSTRACT: The Mediterranean Sea is a hotspot for shark conservation. A decline in large pelagic shark populations has been observed in this vast region over the last 50 years and a lack of data on the
Phylogenetics and biogeography of the walking shark genus Hemiscyllium
Walking, swimming or hitching a ride? Phylogenetics and biogeography of the walking shark genus Hemiscyllium Christine L. Dudgeon, Shannon Corrigan, Lei Yang, Gerry R. Allen, Mark V. Erdmann, Fahmi, Hagi Y. Sugeha, William T. White, Gavin J. P. Naylor ABSTRACT: It can be challenging to identify the forces that drive speciation in marine environments for
Large-scale movements and site fidelity of bull sharks at Reunion Island
Large-scale movements and site fidelity of bull sharks (Carcharhinus leucas) at Reunion Island (Indian ocean) Marc Soria, Yann Tremblay, Antonin Blaison, Fabien Forget, Estelle Crochelet, Laurent Dagorn ABSTRACT: Two bull sharks ( Carcharhinus leucas ) were tagged in coastal waters off Reunion Island in the tropical Indian Ocean and where tracked for 174 and 139
Morphological description of ovary and uterus of the nurse shark caught off Northeast Brazil
Morphological description of ovary and uterus of the nurse shark (Ginglymostoma cirratum) caught off at the Fortaleza coast, Northeast Brazil Mariana G. Rêgo, Maria Lucia G. Araujo, Maria Edna G. Barros, Lorena D’Andrade Aires, Paulo G.V. Oliveira, Fábio H.V. Hazin, John L. Fitzpatrick, Joaquim Evêncio-Neto ABSTRACT: The nurse shark, Ginglymostoma cirratum (Bonnaterre, 1778) is one
The importance of oceanic atoll lagoons for coral reef predators
The importance of oceanic atoll lagoons for coral reef predators Christina Skinner, Aileen C. Mill, Steven P. Newman, S. Nadia Alsagoff, Nicholas V. C. Polunin ABSTRACT: Predators on coral reefs play an important ecological role structuring reef fish communities and are important fishery targets. It is thought that reef predator assemblages increase in density and
Abundance and distribution of the white shark in the Mediterranean Sea
Abundance and distribution of the white shark in the Mediterranean Sea Stefano Moro, Giovanna Jona‐Lasinio, Barbara Block, Fiorenza Micheli, Giulio De Leo, Fabrizio Serena, Massimiliano Bottaro, Umberto Scacco, Francesco Ferretti ABSTRACT: Conservation of apex predators is a key challenge both in marine and terrestrial ecosystems. The white shark is a rare but persistent inhabitant of
Prevalence, persistence and impacts of residual fishing hooks on tiger sharks
Prevalence, persistence and impacts of residual fishing hooks on tiger sharks Michel Bègue, Eric Clua, Gilles Siu, Carl Meyer ABSTRACT: We used long-term observations of 55 individually identified tiger sharks (Galeocerdo cuvier) at a shark ecotourism site off Tahiti to estimate the prevalence, retention times and impacts of residual hooks and trailing line resulting from
The artisanal elasmobranch fishery on Guatemala’s Caribbean coast
Description and characterization of the artisanal elasmobranch fishery on Guatemala’s Caribbean coast Ana Hacohen-Domené, Francisco Polanco-Vásquez, Colombo Estupiñan-Montaño, Rachel T. Graham ABSTRACT: Small-scale shark and ray fisheries are conducted throughout Central America’s Caribbean coast. Yet, there is limited information regarding catch composition and diversity of these fisheries, especially in Guatemala. Surveys of catch landings were