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First records of the megamouth shark as bycatch in Peruvian small-scale net fisheries
First records of the megamouth shark Megachasma pelagios (Taylor, Compagno & Struhsaker, 1983) as bycatch in Peruvian small-scale net fisheries Acuña-Perales, N., Córdova-Zavaleta, F., Alfaro-Shigueto, J., Mangel, J.C. ABSTRACT: Between October 2018 and October 2019, seven megamouth sharks were reported as bycatch in the small-scale surface and midwater gillnet fisheries operating from the ports of
Coastal sharks and rays in a marine protected area in southern Brazil
Coastal sharks and rays in a marine protected area in southern Brazil Paulo R. S. Santos, Marcelo N. Alves, Magnus M. Severo ABSTRACT: In southern Brazil, we investigated shark and ray capture records in an integral protection marine protection area (MPA) that allows fishing in that area. We found 10 shark and nine ray species,
Bigeye thresher shark movements and post-release survivorship
Bigeye thresher shark Alopias superciliosus movements and post-release survivorship following capture on linked buoy gear Scott A. Aalbers, Michael Wang, Charles Villafana, Chugey A.Sepulveda ABSTRACT: Off the US west coast, fishery development efforts have led to the recent recommendation for authorization of deep-set buoy gear (DSBG) and linked buoy gear (LBG), two commercial gear types
Intergenerational microbial transmission in the little skate
Intergenerational microbial transmission in the little skate (Leucoraja erinacea) Katelyn Mika, Alexander S. Okamoto, Neil H. Shubin, David B. Mark Welch ABSTRACT: Microbial transmission from parent to offspring is hypothesized to be universal in vertebrates. However, evidence for this is limited as many clades remain unexamined. Chondrichthyes, as one of the earliest–branching vertebrate lineages, provide
Phylogenetic significance of clasper morphology of electric rays
Phylogenetic significance of clasper morphology of electric rays (Chondrichthyes: Batoidea: Torpediniformes) Renan A. Moreira, Marcelo R. de Carvalho ABSTRACT: Torpediniformes (electric rays) is a monophyletic group strongly supported by morphological and molecular phylogenetic studies. The claspers of electric rays, however, are poorly documented in comparation to the clasper of other batoids, especially skates, and the
Environmental DNA can detect bull sharks across a dynamic deltaic interface
Swimming against the flow—Environmental DNA can detect bull sharks (Carcharhinus leucas) across a dynamic deltaic interface James Marcus Drymon, Katherine E. Schweiss, Emily A. Seubert, Ryan N. Lehman, Toby S. Daly‐Engel, Mariah Pfleger, Nicole M. Phillips ABSTRACT: Human activities in coastal areas are accelerating ecosystem changes at an unprecedented pace, resulting in habitat loss, hydrological
Age, growth and reproductive biology of Trygonorrhina fasciata and Dentiraja australis
Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia Marcelo Reis, Will F. Figueira ABSTRACT: Bottom-dwelling elasmobranchs, such as guitarfishes, skates and stingrays are highly susceptible species to bycatch due to the overlap between their distribution and area of fishing operations. Catch
Effective number of white shark breeders is stable over four successive years in the population adjacent to eastern Australia and New Zealand
Effective number of white shark (Carcharodon carcharias, Linnaeus) breeders is stable over four successive years in the population adjacent to eastern Australia and New Zealand Danielle Davenport, Paul Butcher, Sara Andreotti, Conrad Matthee, Andrew Jones, Jennifer Ovenden ABSTRACT: Population size is a central parameter for conservation; however, monitoring abundance is often problematic for threatened marine
Repeatability of baited remote underwater video station (BRUVS) results within and between seasons
Repeatability of baited remote underwater video station (BRUVS) results within and between seasons C. Samantha Sherman, Michelle R. Heupel, Mohini Johnson, Muslimin Kaimuddin, L. M. Sjamsul Qamar, Andrew Chin, Colin A. Simpfendorfer ABSTRACT: Baited remote underwater video stations (BRUVS) are increasingly being used to evaluate and monitor reef communities. Many BRUVS studies compare multiple sites
Variable response to electric shark deterrents in bull sharks
Variable response to electric shark deterrents in bullsharks, Carcharhinus leucas A Gauthier, E Chateauminois, M Hoarau, J Gadenne, E Hoarau, Sébastien Jaquemet, S Whitmarsh, C Huveneers ABSTRACT: Although relatively rare, human-shark interactions and sharks bites are increasing globally, which has led to the development of various mitigation measures. Electric shark deterrents (ESDs) have, so far,
Disentangling the shark and ray trade in Indonesia to reconcile conservation with food security
Disentangling the shark and ray trade in Indonesia to reconcile conservation with food security Andhika P. Prasetyo, Allan D. McDevitt, Joanna M. Murray, Jon Barry, Firdaus Agung, Efin Muttaqin, Stefano Mariani ABSTRACT: Indonesian marine resources are among the richest on the planet, sustaining highly diverse fisheries and includes the largest elasmobranch landings in the world,
Distribution and abundance of large pelagic species at Cocos Ridge seamounts
A first assessment of the distribution and abundance of large pelagic species at Cocos Ridge seamounts (Eastern Tropical Pacific) using drifting pelagic baited remote cameras Marta Cambra, Frida Lara-Lizardi, Cesar Peñaherrera, Alex Hearn, James T. Ketchum, Patricia Zarate, Carlos Chacón, Jenifer Suárez-Moncada, Esteban Herrera, Mario Espinoza ABSTRACT: Understanding the link between seamounts and large pelagic
Effects of monofilament nylon versus braided multifilament nylon gangions on catch rates of Greenland shark
Effects of monofilament nylon versus braided multifilament nylon gangions on catch rates of Greenland shark (Somniosus microcephalus) in bottom set longlines Scott M. Grant, Jenna G. Munden, Kevin J. Hedges ABSTRACT: The Greenland shark (Somniosus microcephalus) is the main bycatch species in established and exploratory inshore longline fisheries for Greenland halibut (Reinhardtius hippoglossoides) on the
Relationship between the biomass of reef shark and fish in South Morotai
Relationship between the biomass of reef shark and fish in South Morotai Waters, North Maluku, Indonesia Sofyan JF, Ambariyanto A, Suwartimah K, Toha AHA ABSTRACT: This study aims to determine the biomass of reef shark and fish in South Morotai Waters in North Maluku, Indonesia. The Audible Stationary Count and Underwater Visual Census method were
Reproductive biology of the Rasptail skate
Reproductive biology of the Rasptail skate Rostroraja velezi (Rajiformes: Rajidae) Katherin Soto‐López PhD, Rosa Isabel Ochoa‐Báez PhD, Felipe Galván‐Magaña PhD, Maria Cristina Oddone PhD ABSTRACT: The Rasptail skate Rostroraja velezi is commercially exploited in artisanal elasmobranch fisheries along the west coast of Baja California Sur, Mexico, but information on its life history is limited. This