Results 21 to 30 of about 864 (141)

Condição de Hoplias aff. malabaricus (BLOCH, 1794) EM dois rios costeiros da bacia do Rio Itanhaém/SP

Boletim do Instituto de Pesca, 2018
O objetivo deste trabalho foi mensurar a condição de Hoplias aff. malabaricus do rio Aguapeú (águas pretas) e do rio Branco (águas brancas), ambos pertencentes í­Â  bacia hidrográfica do rio Itanhaém, na costa do litoral de São Paulo.
Evandro Bonocchi de SANT'ANNA, Roberto GOITEIN   +1 more
doaj   +1 more source

Food resources used by three species of fish in the semi-arid region of Brazil [PDF]

Neotropical Ichthyology
Temporary and semi-permanent aquatic habitats in semi-arid Brazil have been reported as important sites supporting a diverse fish fauna. As such, they must be able to trophically sustain fish species that feed at different trophic levels. This study aims
Márcio J. da Silva, Bruno R. S. Figueiredo, Robson T. C. Ramos, Elvio S. F. Medeiros   +3 more
doaj   +2 more sources

Desenvolvimento inicial de Hoplias aff. malabaricus (Bloch, 1794) (Osteichthyes, Erythrinidae) da planície alagável do alto rio Paraná, Brasil = Early development of Hoplias aff. malabaricus (Bloch, 1794) (Osteichthyes, Erythrinidae) in the upper Paraná river floodplain, Brazil

Acta Scientiarum: Biological Sciences, 2008
Este trabalho teve por objetivo caracterizar o desenvolvimento inicial de Hoplias aff. malabaricus. As amostragens foram realizadas entre novembro de 1991 e fevereiro de 1995, em 42 estações de coleta, distribuídas em vários ambientes da planície ...
doaj   +1 more source

Fish larvae from the upper Paraná River: do abiotic factors affect larval density? [PDF]

Neotropical Ichthyology
The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná ...
Gilmar Baumgartner, Keshiyu Nakatani, Luiz Carlos Gomes, Andréa Bialetzki, Paulo Vanderlei Sanches, Maristela Cavicchioli Makrakis   +5 more
doaj   +2 more sources

Linking rivers, mixing faunas: How artificial connectivity between the Middle and Upper Paraná River basins shapes fish diversity in a tributary of the Itaipu Reservoir, Brazil. [PDF]

J Fish Biol
Abstract This work aimed to investigate the distribution and occurrence of fish species along the São Francisco Falso Braço Norte (SFFBN) River basin, a tributary of the Middle Paraná River basin now artificially connected to the Upper Paraná ecoregion, to evaluate how such connectivity may affect the biogeographic distribution and regional composition
Kampfert LEP, Maicrovicz JC, Blanco DR, Lange D, Pavanelli CS, Brandão H.   +5 more
europepmc   +2 more sources

Oxygen consumption from air and water, ammonia and urea-N excretion, and Na⁺ fluxes during progressive aquatic hypoxia in Amazonian armoured catfish Pterygoplichthys gibbiceps and Pterygoplichthys pardalis. [PDF]

J Fish Biol
Abstract The Amazonian loricariid fish Pterygoplichthys gibbiceps, from the Rio Negro, and Pterygoplichthys pardalis, from the Rio Solimões, are facultative air‐breathers that can use the stomach as an air‐breathing organ. Measurement of oxygen uptake under progressive aquatic hypoxia revealed a relatively high hypoxia resistance of both species.
Pelster B, Wood CM, Val AL.
europepmc   +2 more sources

Hydrological Connectivity Enhances Fish Biodiversity in Amazonian Mining Ponds: Insights From eDNA and Traditional Sampling. [PDF]

Mol Ecol
ABSTRACT Artisanal and small‐scale gold mining (ASGM) expansion in the Madre de Dios region of the Peruvian Amazon has transformed primary forests into a novel wetland complex of thousands of abandoned mining ponds. Despite their ecological relevance, post‐mining recovery of these systems remains understudied, particularly regarding fish biodiversity ...
Timana-Mendoza C, Reyes-Calderón A, Venail P, Britzke R, Santa-Maria MC, Araújo-Flores JM, Silman M, Fernandez LE.   +7 more
europepmc   +2 more sources

Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon. [PDF]

J Fish Biol
Abstract Siluriform fishes collected from the Rio Negro and Rio Solimões proved to be highly resistant to aquatic hypoxia. In all four species analysed in this study, aquatic oxygen consumption significantly decreased from normoxic levels at water PO2 values near 1 kPa. Air‐breathing activity was observed only in Sturisoma sp. (Rio Negro).
Pelster B, Wood CM, Val AL.
europepmc   +2 more sources

Using the swimbladder as a respiratory organ and/or a buoyancy structure—Benefits and consequences

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Volume 335, Issue 9-10, Page 831-842, November 1, 2021., 2021
Graphical abstract Abstract A swimbladder is a special organ present in several orders of Actinopterygians. As a gas‐filled cavity it contributes to a reduction in overall density, but on descend from the water surface its contribution as a buoyancy device is very limited because the swimbladder is compressed by increasing hydrostatic pressure.
Bernd Pelster
wiley   +1 more source

Fish fauna of moderate altitude from first order stream in upper Rio Machado, Rondônia, Brazil [PDF]

, 2022
This study represents an inventory of fish collected in a first order tributary of the Igarapé Piracolina at Chapada dos Parecis, upper Rio Machado drainage, Rio Madeira basin, Vilhena, Rondônia, Brazil.
Loeb, Marina, Loeb, Marina Vianna, Ohara, Willian Massaharu   +2 more
core   +2 more sources