Results 61 to 70 of about 889 (175)

Serum chemistry, thyroxine concentration, and blood cell morphology of wild, young Blackchin Guitarfish Glaucostegus cemiculus sampled on the eastern Mediterranean coastline

Journal of Aquatic Animal Health, Volume 36, Issue 3, Page 281-299, September 2024.
Abstract Objective The Blackchin Guitarfish Glaucostegus cemiculus is endemic to the Mediterranean Sea and is critically endangered, but relevant routine laboratory data are unavailable. Our objectives were to determine the packed cell volume (PCV), comprehensive serum chemistry analytes, and serum total thyroxine (sTT4) concentration; compare serum ...
Nevo Schwartz, Danny Morick, Barak Azrieli, Aviad Scheinin, Dan Tchernov, Itamar Aroch   +5 more
wiley   +1 more source

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   +1 more source

Taxonomía, biología reproductiva y usos de rayas de agua dulce (Myliobatiformes: Potamotrygonidae) en el río Amazonas colombiano [PDF]

, 2020
From the revision of 116 specimens of the Potamotrygonidae family collected in the Colombian Amazon River, the four genera described for the family are registered for the study area, with the species Heliotrygon gomesi, Plesiotrygon iwamae ...
Acosta Santos, Astrid Alexia
core   +1 more source

Sexual dimorphism of the pelvic fins in Potamotrygon motoro (Batoid: Potamotrigonidae)

Revista de Investigaciones Veterinarias del Perú, 2023
Claspers in chondrichthyans are specialized elongations on the posterior side of the pelvic fins of males that are used for sperm transfer during copulation. The aim of this study was the description and characterization of the external morphology and skeletal components of the pelvic fin clasper of Potamotrygon motoro (Batoidea: Potamotrygonidae). The
Pérez, Dante, Olea, Gabriela, Blanco Cohene, Tania, Rodriguez Florencia, Evelyn, Flores Quintana, Carolina   +4 more
openaire   +1 more source

Morfometria de raias continentais (Chondrichthyes, Potamotrygonidae) do alto rio Paraná, Brasil = Morphometry of upper Paraná river freshwater stingrays (Chondrichthyes, Potamotrygonidae)

Acta Scientiarum: Biological Sciences, 2007
Potamotrygonidae constitui o único grupo recente de Chondrichthyes cujo habitat está restrito, exclusivamente, a águas continentais. Na planície de inundação do Alto rio Paraná, espécies desta família estabeleceram-se após o fechamento das comportas da ...
Antonio Guilherme Cândido da Silva, Erivelto Goulart   +1 more
doaj  

Parâmetros sanguíneos da arraia de água doce Potamotrygon orbignyi Castelnau, 1855 (Potamotrygonidae) da Bacia do Rio Negro, Amazonas, Brasil. [PDF]

, 2017
A região Amazônica apresenta a maior diversidade de espécies de potamotrigonídeos, algumas com distribuição ampla como as arraias Paratrygon aiereba, Potamotrygon motoro e Potamotrygon orbignyi, sendo essa última encontrada nas bacias dos rios Amazonas ...
DIAS, M. T., LEMOS, J. R. G., MARCON, J. L., OLIVEIRA, A. T. de, PEREIRA, C. do N., SANTOS, M. Q. de C.   +5 more
core  

Ecological and Phenotypic Diversification after a Continental Invasion in Neotropical Freshwater Stingrays [PDF]

, 2022
Habitat transitions are key potential explanations for why some lineages have diversified and others have not—from Anolis lizards to Darwin\u27s finches.
Dean, Mason N, Fontenelle, Joao Pedro, Kolmann, Matthew, Lovejoy, Nathan R, Marques, Fernando PL, Weaver, James C   +5 more
core   +1 more source

Condrictios de la Argentina y Uruguay: lista de trabajo [PDF]

, 2007
Presentamos aquí una lista actualizada de los condrictios (tiburones, rayas, quimeras y pez elefante) que han sido citados de la Argentina y Uruguay, incluyendo las especies de agua dulce de la familia Potamotrygonidae.
Lucifora, Luis O., Menni, Roberto C.
core  

Feeding behavior of the Neotropical freshwater stingray Potamotrygon motoro (Elasmobranchii: Potamotrygonidae)

Neotropical Ichthyology
The feeding mechanisms of elasmobranchs and their functioning have been receiving growing scientific attention, although less emphasis has yet to be directed towards batoid species.
Akemi Shibuya, Jansen Zuanon, Sho Tanaka
doaj   +1 more source

Identification of Species Composition in the Hong Kong Shark Fin Trade using Genetic Techniques and Trader Records [PDF]

, 2001
Trade in shark fins represents one of the most serious threats to shark populations worldwide. Previous studies have indicated that certain types of fins are more valued than others, but due to the largely unregulated and often covert nature of the trade,
Clarke, Shelley C., McAllister, Murdoch K., Shivji, Mahmood S.   +2 more
core   +1 more source