Results 31 to 40 of about 1,538 (201)
Records of new localities and hosts for crustacean parasites in fish from the eastern Amazon in northern Brazil. [PDF]
J Parasit Dis, 2017 The aim of this study was to investigate parasites crustacean fauna in Arapaima gigas, Cichla monoculus, Cichla ocellaris, Cichla jariina, Satanoperca jurupari, Leporinus friderici, Leporinus fasciatus, Hoplias malabaricus, Phractocephalus hemioliopterus,
Oliveira MSB +4 more
europepmc +3 more sources
Acta Scientiarum: Biological Sciences, 2006 As raias Potamotrygon falkneri e Potamotrygon motoro foram avaliadas em relação à composição de suas dietas e a sobreposição do nicho trófico nos períodos de seca (agosto/2004) e cheia (janeiro/2005) na planície alagável do alto rio Paraná, em três ...
Milza Celi Fedatto Abelha +3 more
doaj +1 more source
Acta Amazonica, 2012 Freshwater stingrays, or potamotrygonids, are restricted to Neotropical river drainages. These elasmobranchs are well adapted to freshwater environments and the number of described species gradually increases as further research is carried out.
María Cristina Oddone +2 more
doaj +2 more sources
A comparison of staff presence and signage on zoo visitor behavior
Zoo Biology, Volume 42, Issue 3, Page 407-415, May/June 2023., 2023 The presence of uniformed zoo staff reduced negative behaviors by zoo visitors more effectively than signage. Abstract Many zoos favor the use of signage to encourage learning and positive visitor experiences as well as discourage negative behaviors by visitors because of its simplicity, relatively low maintenance needed, and low cost. However, current
Claudia Tay +5 more
wiley +1 more source
Journal of Fish Biology, Volume 99, Issue 4, Page 1158-1189, October 2021., 2021 ABSTRACT Freshwater fish communities in Ecuador exhibit some of the highest levels of diversity and endemism in the Neotropics. Unfortunately, aquatic ecosystems in the country are under serious threat and conditions are deteriorating. In 2018–19, the government of Ecuador sponsored a series of workshops to examine the conservation status of Ecuador's ...
Windsor E. Aguirre +15 more
wiley +1 more source
Combined effects of life‐history traits and human impact on extinction risk of freshwater megafauna
Conservation Biology, Volume 35, Issue 2, Page 643-653, April 2021., 2021 Abstract Megafauna species are intrinsically vulnerable to human impact. Freshwater megafauna (i.e., freshwater animals ≥30 kg, including fishes, mammals, reptiles, and amphibians) are subject to intensive and increasing threats. Thirty‐four species are listed as critically endangered on the International Union for Conservation of Nature (IUCN).
Fengzhi He +5 more
wiley +1 more source
A histology-based study in apparently healthy wild freshwater stingrays Potamotrygon motoro [PDF]
Comparative Clinical Pathology, 2015 Histopathological studies are important as a reference in pathological process. There are a few of these studies in elasmobranchs. The aim of this study was to describe the histology of kidney, spleen, liver, and gills of wild apparently healthy Potamotrygon motoro. However, we observed some pathological findings in these animals. Nineteen P.
J. E. D. de Moraes +3 more
semanticscholar +4 more sources
Anais da Academia Brasileira de Ciências, 2021 In the Xingu river basin, Brazil, occurs two genera of Potamotrygonidae family: Potamotrygon and Paratrygon. In this region, the taxa have significant economic importance for the ornamental fishing industry, being intensively captured, especially the ...
DAMIRES SANCHES +10 more
doaj +1 more source
Digenea, Nematoda, Cestoda, and Acanthocephala, parasites in Potamotrygonidae (Chondrichthyes) from the upper Paraná River floodplain, states of Paraná and Mato Grosso do Sul, Brazil [PDF]
Check List, 2008 The present paper represents the first study on the endoparasitic fauna of Potamotrygon falkneri and P. motoro in the upper Paraná River floodplain. Fishes were collected by fishing rod and gillnetting in different stations of the floodplain, from March,
Ana Lacerda +2 more
doaj +5 more sources
Proposal of a non-lethal visual census method to estimate freshwater stingray abundance
Universitas Scientiarum, 2016 There is not a current method to estimate South American freshwater stingray’s abundance. Therefore we designed a census method and tested it in the field.
Mónica Andrea Morales-Betancourt +1 more
doaj +1 more source