Atlantoraja cyclophoraé uma patim endémica para a plataforma continental do Sudoeste do Oceano Atlântico (22ºS-47ºS) e uma espécie de captura acessória na pesca comercial de arrasto de fundo. As relações morfométricas, o tamanho na maturidade e o ciclo reprodutivo desta espécie foram analisado...
A fundamental challenge for both sustainable fisheries and biodiversity protection in the Neotropics is the accurate determination of species identity. The biodiversity of the coastal sharks of Guyana is poorly understood, but these species are subject to both artisanal fishing as well as harvesting by i...
Chondrichthyans are extremely susceptible to overfishing due, among other things, to their reproductive adaptations. Basic knowledge of reproductive parameters is essential, both of ecological and for economic points of view. Zearaja chilensis is a valuable economic resource in South America. This work a...
The ecotouristic approach to sharks and rays has developed rapidly in the last 20 years. We studied three species in Gorgona Island from 427 dives ( 2004-2011), including 866 photographs and videos. There was at least one sighting in 34.4% of the dives, and 25.0% of the photos and videos were useful for ...
Isla del Coco is an oceanic island 500km off the Pacific coast of Costa Rica. It is a National Park and its marine fauna has been relatively well protected. The island is famous for its elasmobranch (sharks, rays and skates) sightings in shallow waters. Here we present a catalogue of the deepwater elasmo...
One hunting tactic of freshwater rays (Potamotrygonidae), termed "undulate the disc and stir substrate", is here reported to attract cichlids at two sites in the upper Paraná River. The ray species involved in such association are Potamotrygon falkneri and P. motoro, whose activity attract four cichlid ...
All species of sawfish are listed by the International Union for the Conservation of Nature (IUCN) as endangered or critically endangered. In fact, the smalltooth sawfish Pristis pectinata, and the largetooth sawfish Pristis pristis, have been declared to be regionally and locally extinct from the US Atl...
Os peixes, inclusive os elasmobrânquios, podem apresentar inúmeras patogenias, incluindo neoplasias malignas. Estas neoplasias podem estar ligadas a uma série de fatores ambientes ou genéticos. No caso específico dos tubarões e raias, as manifestações mais recorrentes de neoplasias referem-se jus...
Los elasmobraquios son modelos naturales espontáneos importantes para el estudio de la hemopoyesis, dado que tienen disecados naturalmente los distintos microambientes inductores. Describimos la microarquitectura y la morfología celular de las dos estructuras granulopoyéticas principales de Mustelus s...
