Results 21 to 30 of about 519,530 (231)

Occurrence of multiple congenital anomalies in Potamotrygon amandae (Elasmobranchii, Potamotrygoninae) embryos, including the first report of bicephaly. [PDF]

J Fish Biol
Abstract Reports of teratogenic embryos in elasmobranchs have been documented in multiple species, with proposed aetiologies including environmental disturbances, genetic mutations, predation, exposure to endocrine‐disrupting compounds and maternal stress.
de Castro Ribeiro D, Queiroz RL, da Silva Ribeiro C.   +2 more
europepmc   +2 more sources

Influence of the Level of the Middle River Negro in the Amazon, Brazil, on the Properties of the Blood of the Cururu Freshwater Stingray Potamotrygon wallacei

Limnological Review
Amazonian fishes, as an adaptive form to the annual flood cycle, develop physiological strategies to adjust to variations in their habitats. The results of this study help to understand how freshwater stingrays adapt to changes in river levels and allow ...
Adriano Teixeira de Oliveira, Ariany Rabello da Silva Liebl, Maria Fernanda da Silva Gomes, Maiko Willas Soares Ribeiro, Rayana Melo Paixão, Antônia Jaqueline Vitor Paiva, Suelen Miranda dos Santos, João Paulo Ferreira Rufino, Junior Ribeiro Carvalho, Paulo Henrique Rocha Aride   +9 more
doaj   +2 more sources

Cyrilia sp. (Apicomplexa: Haemogregarinidae) in the Amazonian freshwater stingray Potamotrygon wallacei (cururu stingray) in different hydrological phases of the Rio Negro

Brazilian Journal of Biology
Intraerythrocytic parasites are frequently found in fish, including elasmobranchs. The Amazonian rivers present well defined annual hydrological cycles that results in drastic modifications of the environmental conditions with deep implications in the ...
A. T. Oliveira, M. L. G. Araújo, J. Pantoja-Lima, P. H. R. Aride, M. Tavares-Dias, R. P. Brinn, J. L. Marcon   +6 more
doaj   +2 more sources

Monitoring Biogenic Amines: Comparative Assessment of Detection Methods for Key Market Marine and Freshwater Species. [PDF]

J Food Sci
ABSTRACT Biogenic amines, primarily histamine, cadaverine, and putrescine, are important indicators of microbial spoilage and potential health risks. This review summarizes established and novel analytical methods for quantitatively determining biogenic amines in fish and fish products, along with their limits of detection in these complex matrices ...
Petersen L.
europepmc   +2 more sources

Injuries caused by freshwater stingrays in the Tapajós River Basin: a clinical and sociodemographic study [PDF]

Revista da Sociedade Brasileira de Medicina Tropical, 2017
INTRODUCTION Freshwater stingray envenomations are an important cause of morbidity in riverine populations living in various regions of Brazil. The sequelae include temporary or permanent disability.
Paulo Afonso Martins Abati, Pasesa Pascuala Quispe Torrez, Francisco Oscar de Siqueira França, Fabio Lambertini Tozzi, Flávio Mileo Bacelar Guerreiro, Suellen Aline Torres dos Santos, Sheyla Mara Silva de Oliveira, Vidal Haddad Junior   +7 more
doaj   +7 more sources

A new species of freshwater stingray (Myliobatiformes: Potamotrygoninae) from northern South America

Neotropical Ichthyology
A new species of freshwater stingray (Potamotrygoninae) is described from the Demerara River, Guyana and río Guanare, Venezuela. It is distinguished from all other regional congeneric taxa (i.e., Potamotrygon marinae, P. schroederi, P.
Devya Hemraj-Naraine, João Pedro Fontenelle, Astrid Acosta-Santos, Nathan R. Lovejoy, Elford Liverpool, Matthew A. Kolmann   +5 more
doaj   +2 more sources

Pseudoaneurysm following a freshwater stingray injury

Journal of the European Academy of Dermatology and Venereology, 2019
Complications of aquatic envenomations can pose clinical challenges to dermatologists(1). We report here a rare, potentially threatening complication of a stingray stabbing.
Romain Blaizot, G. Desrousseaux, M. Joly, A. Vie, X. Lu, A. Senchyna, K. Oganov, C. Marty, H. Cissé, P. Couppié   +9 more
semanticscholar   +2 more sources

An unusual, dwarf new species of Neotropical freshwater stingray, Plesiotrygon nana sp. nov., from the upper and mid Amazon basin: the second species of Plesiotrygon (Chondrichthyes: Potamotrygonidae)

Papeis Avulsos De Zoologia, 2011
A new species of the relatively poorly known Neotropical freshwater stingray genus Plesiotrygon Rosa, Castello & Thorson, 1987 is described from the main channel and smaller tributaries (Ríos Itaya and Pachitea) of the upper Amazon basin in Peru.
Marcelo R De Carvalho
exaly   +3 more sources

Sharks and Rays of Northern Australia’s Roper River, with a Range Extension for the Threatened Speartooth Shark Glyphis glyphis [PDF]

Animals
Northern Australia is considered a ‘lifeboat’ region for globally threatened shark and ray species (elasmobranchs), although much of the region is understudied.
Julia M. Constance, Erica A. Garcia, Yugul Mangi Rangers, Christy-Louise Davies, Peter M. Kyne   +4 more
doaj   +2 more sources

Visual discrimination and resolution in freshwater stingrays (Potamotrygon motoro) [PDF]

Journal of Comparative Physiology A, 2020
AbstractPotamotrygon motoro has been shown to use vision to orient in a laboratory setting and has been successfully trained in cognitive behavioral studies using visual stimuli. This study explores P. motoro’s visual discrimination abilities in the context of two-alternative forced-choice experiments, with a focus on shape and contrast, stimulus ...
Martha M. M. Daniel, Laura Alvermann, Imke Böök, Vera Schluessel   +3 more
openaire   +2 more sources