Results 31 to 40 of about 3,591 (200)
Ecophysiological interactions and water-related physicochemical parameters among freshwater stingrays [PDF]
Brazilian Journal of Biology, 2016 Abstract The objective of this study was to compare and correlate the ecology of neonates and young individuals of Potamotrygon wallacei, Potamotrygon motoro and Paratrygon aiereba with regard to their hematological profile and the physicochemical parameters of the water that they inhabit.
Oliveira, A. T. +7 more
openaire +5 more sources
Description of a new actinosporean type from South African freshwater [PDF]
, 2004 The 1st report on actinospores described these organisms as parasites related to myxosporeans. For a long time this group of parasites was believed to represent an independent taxonomic entity.
Avenant-Oldewage, Annemarie +2 more
core +1 more source
The Influence of Body Size and Hemoglobin Multiplicity on Critical Oxygen Threshold in Red Drum (Sciaenops ocellatus) [PDF]
, 2016 Hypoxia is common in marine environments and fishes use a suite of cardiorespiratory adjustments to defend aerobic metabolism, including reducing standard metabolic rate (SMR), the minimum metabolic rate needed to sustain life at a specified temperature,
Pan, Yihang
core +1 more source
Integrative and Comparative Biology, 2022 AbstractHabitat transitions are key potential explanations for why some lineages have diversified and others have not—from Anolis lizards to Darwin's finches. The ecological ramifications of marine-to-freshwater transitions for fishes suggest evolutionary contingency: some lineages maintain their ancestral niches in novel habitats (niche conservatism),
Kolmann, M. +5 more
openaire +3 more sources
Biovalentia: Biological Research Journal, 2022 A study to determine morphological characets of freshwater stingray in Musi River of South Sumatra Province has been conducted from June to December 2020. The fishes were collected in Musi River where located at middle of Palembang city.
Amran Halim +2 more
doaj
Endangered Species Research, 2023 Recently, Lim & Then (2022; Endang Species Res 48:43-50) used an environmental DNA (eDNA) PCR-based method for detecting the presence of an endangered species of freshwater stingray, Fluvitrygon kittipongi (Dasyatidae), in the Pahang River basin, east ...
NFMAH Alshari +4 more
doaj +1 more source
Venomous Freshwater Fish: Catfish and Freshwater Stingrays
, 2014 The authors comment the actual research on the properties of the toxins of the freshwater venomous fish and their potential use in Human Medicine. They discuss the mechanisms of inoculation, biochemical characteristics of the venoms, and clinical/therapeutical aspects of the envenomations, with emphasis in their studies on freshwater stingrays and ...
Haddad, Vidal +7 more
openaire +1 more source
Scientia Marina, 2020 The aim of this study was to assess the suitability of different vertebrae staining techniques for the visualization and counting of growth bands in tropical species of batoids (Narcine leoparda, Urotrygon aspidura, Hypanus longus, Potamotrygon ...
José G. Pérez-Rojas +4 more
doaj +1 more source
RECTAL GLAND OF FRESHWATER STINGRAYS,POTAMOTRYGONSPP. (CHONDRICHTHYES:POTAMOTRYGONIDAE)
The Biological Bulletin, 1978 1. Contrary to some reports, a rectal gland is present in strictly freshwater stingrays of South American rivers (Potamotrygon spp.). 2. The gland has the location and histological features of the salt-secreting rectal gland of marine elasmobranchs, but is much reduced in size and number of tubules. 3. Its residual function, if any, is unknown. 4.
T B, Thorson, R M, Wotton, T A, Georgi
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Zoologia (Curitiba), 2010 Ergasilus trygonophilus sp. nov. is described from freshwater stingrays (Potamotrygon spp. and Plesiotrygon iwamae Rosa, Castello & Thorson, 1987) from the state of Pará, Brazil.
Marcus V. Domingues, Taísa M. Marques
doaj +1 more source