Results 31 to 40 of about 582 (123)

Isoform expression in the multiple soluble malate dehydrogenase of Hoplias malabaricus (Erythrinidae, Characiformes)

Brazilian Journal of Biology
Kinetic properties and thermal stabilities of Hoplias malabaricus liver and skeletal muscle unfractionated malate dehydrogenase (MDH, EC 1.1.1.37) and its isolated isoforms were analyzed to further study the possible sMDH-A* locus duplication evolved ...
M. R. Aquino-Silva, M. L. B. Schwantes, A. R. Schwantes   +2 more
doaj   +1 more source

Integrated use of biomarkers to evaluate the reproductive physiology of Astyanax fasciatus and Hoplias malabaricus males (Teleostei: Characiformes) in polluted reservoirs

Ecotoxicology and Environmental Safety, 2021
The reproductive physiology of fish can be changed by the presence of pollutants in the water, which act as endocrine disrupting compounds (EDC).
Maria C. Escalante-Rojas, Carlos E. Tolussi, Aline D. Gomes, Marcela Muñoz-Peñuela, Gabriela Brambila-Souza, Giovana S. Branco, Renata G. Moreira   +6 more
doaj   +1 more source

Anthropogenic Factors Drive the Depletion of Fish Functional Β Diversity Within and Outside Two National Reserves in the Peruvian Amazon

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 35, Issue 12, December 2025.
ABSTRACT Understanding the impact of human activities on fish communities is critical for the effective conservation of Amazonian ecosystems. In this study, we sampled environmental DNA (eDNA) from 17 sites (lakes and rivers) in two Peruvian national reserves, Pacaya‐Samiria and Allpahuayo‐Mishana, using a metabarcoding approach with four genetic ...
B. Prat, C. Mariac, J.‐F. Renno, C. García‐Dávila, C. Angulo, G. Estivals, F. Duponchelle   +6 more
wiley   +1 more source

Ureotelism is inducible in the neotropical freshwater Hoplias malabaricus (Teleostei, Erythrinidae)

Brazilian Journal of Biology
Increased environmental pH decreases ammonia transport through the gills, impairing nitrogenous waste. The consequent toxicity is usually drastic to most fishes. A few species are able to synthesize urea as a way to detoxify plasma ammonia.
G. Moraes, V. L. P. Polez
doaj   +1 more source

Urophysial and pituitary extracts for spawning induction in teleosts Extratos urofisário e hipofisário para indução da desova em teleósteos

Ciência Rural, 2000
Several studies have suggested that the caudal neurosecretory system could act on fish reproduction. The aim of this study was to compare the effect of urophysial extract (UE) and carp pituitary homogenate (CPH) on the induction of spawning in Hoplias ...
Everton Rodolfo Behr, Bernardo Baldisserotto, Walter Garcia Parra, Deodoro Atlante Brandão, Zolst Herke   +4 more
doaj   +1 more source

Seasonal Forest Resources Support Fish Biomass in Floodplain Lakes of an Amazonian Tributary

Freshwater Biology, Volume 70, Issue 11, November 2025.
ABSTRACT The Flood Pulse Concept is a foundational ecological theory that emphasizes the critical role of lateral connectivity between a river channel and its floodplain. Many tropical rivers inundate the surrounding floodplain in the flood stage, thereby receiving large amounts of terrestrial organic matter that can be decomposed by microbes and ...
Timothy D. Jardine, Francisco Villamarín, Joseph E. Hawes, Joao Campos‐Silva, Cristina M. Jacobi, Stephen Srayko, Alexander Pelletier, William E. Magnusson   +7 more
wiley   +1 more source

The Role of Fish in Nutrient Recycling Across a Conservation Gradient in Neotropical Streams

Freshwater Biology, Volume 70, Issue 10, October 2025.
ABSTRACT Fish play a crucial role in nutrient recycling within various aquatic ecosystems, but how their contribution varies across streams with different levels of disturbance remains poorly understood. In our study, we investigated the role of fish assemblage in nutrient cycling within eight Neotropical streams characterised by varying degrees of ...
Ronny José de Morais, Gaston E. Small, Samantha Salomão Caramori, Fabrício Barreto Teresa   +3 more
wiley   +1 more source

Species of the Hoplias aff malabaricus complex (Characiformes: Erythrinidae): An investigation of coexistence in a Neotropical floodplain

Zoologia (Curitiba), 2012
This study assessed the coexistence of three species of thraira present in the Upper Paraná River floodplain, using population structure as an investigation tool. The species were designated as: Hoplias sp.
Marília Hauser, Evanilde Benedito
doaj   +1 more source

Estudo das propriedades funcionais da hemoglobina de Hoplias malabaricus e Hoplerythrinus unitaeniatus [PDF]

Acta Amazonica, 1978
Resumo Hemolisados de Hoplias malabaricus e Hoplerythrinus unitaeniatus apresentaram padrões pouco nítidos de hemoglobina com 3 a 4 bandas, respectivamente, por eletroforesis alcalina em gel de disco.
Austen Riggs, Hans Jorgen Fyhn, Unni E. H. Fyhn, Robert W. Noble   +3 more
doaj   +1 more source

Performance of eDNA Filtration Methods for Monitoring Fish Diversity in a Hyper‐Tidal Estuary

Environmental DNA, Volume 7, Issue 5, September–October 2025.
This study evaluates four eDNA filtering methods, three manual filters (0.45, 1.2, and 5 μm) and a passive method, the metaprobe, across a salinity gradient in a hyper‐tidal estuarine ecosystem. Results show that the 0.45 μm filter detected the highest species richness (39 species), followed by the metaprobe (35 species), and the 1.2 μm (34 species ...
Jake M. Jackman, Naiara Guimarães Sales, Chiara Benvenuto, Andrea Drewitt, Andrew Wolfenden, Peter E. Robins, Ilaria Coscia, Allan D. McDevitt   +7 more
wiley   +1 more source