Results 71 to 80 of about 1,823 (231)
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 +5 more
wiley +1 more source
Acta Scientiarum: Biological Sciences, 2023 The family Potamotrygonidae are the only species of stingrays restricted to fresh water and located exclusively in South America. The objective of this research was to analyze the morphological aspects and germ cells of the male reproductive tract of ...
Stefhani Cristina Chan Jacik +6 more
doaj +1 more source
Vulnerability of Eastern Tropical Pacific chondrichthyan fish to climate change
Global Change Biology, Volume 30, Issue 7, July 2024.This assessment identifies sharks' vulnerability to climate change in a data‐poor tropical region and suggests management actions. Abstract Climate change is an environmental emergency threatening species and ecosystems globally. Oceans have absorbed about 90% of anthropogenic heat and 20%–30% of the carbon emissions, resulting in ocean warming ...
Florencia Cerutti‐Pereyra +18 more
wiley +1 more source
, 2020 The Brazilian Amazonian coast, extending from Amapá to Maranhão states, is drained by a series of small to medium sized rivers of the Amazon basin. The PindaréMearim is an isolated basin formed by the junction of the Pindaré and Mearim rivers at its ...
G. Rincon +9 more
semanticscholar +1 more source
The more stirring the better: cichlid fishes associate with foraging potamotrygonid rays
Neotropical IchthyologyOne 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.
Domingos Garrone-Neto, Ivan Sazima
doaj +1 more source
Diversidad gen?tica de potamotrygon motoro en las cuencas del Onrin?co y Amazonas colombiano [PDF]
, 2017 61 p. Recurso Electr?nicoLa falta de claridad frente a la taxonom?a de Potamotrygon motoro y la ausencia de estudios previos de su diversidad gen?tica, hace a la especie vulnerable al ser la segunda especie de raya de agua dulce m?s extra?da y exportada ...
Renza Mill?n, Mariana
core
SERUM COMPOSITION OF FRESHWATER STRINGRAYS (POTAMOTRYGONIDAE) ADAPTED TO FRESH AND DILUTE SEA WATER
The Biological Bulletin, 1973 1. Juvenile freshwater stingrays of the family Potamotrygonidae are unable to survive in salinities in excess of 20.6‰ when gradually acclimated.2. No differences were observed in blood pH or hematological parameters when fish adapted to a salinity of 14.5‰ were compared with freshwater controls.3. Significant increases were found in serum sodium (21%),
ROBERT W. GRIFFITH +3 more
openaire +2 more sources
Stirring, charging, and picking: hunting tactics of potamotrygonid rays in the upper Paraná River
Neotropical IchthyologyHunting tactics of potamotrygonid freshwater rays remain unreported under natural conditions. Three main foraging tactics of Potamotrygon falkneri and P. motoro are described here based on underwater observations in the upper Paraná River.
Domingos Garrone-Neto, Ivan Sazima
doaj +1 more source
Eritrograma e bioquímica do plasma da arraia Paratrygon aiereba (Chondrichthyes: Potamotrygonidae) do Arquipélago Mariuá, médio Rio Negro, Amazonas. [PDF]
, 2011 Resumo ...
ARAÚJO, M. L. G. +5 more
core
Biota Colombiana, 2018 Se registra por primera vez para Colombia (cuenca del Orinoco), cuatro especies de crustáceos ectoparásitos en rayas de agua dulce (Potamotrygonidae), género Potamotrygon.
Carlos Andrés Lasso +3 more
doaj