Results 1 to 10 of about 663 (166)

Length-weight relationship of trahira Hoplias aff. malabaricus (Bloch, 1794) in a regulated stream of southern Brazil

Biotemas, 2016
This paper presents an allometric study of the length-weight relationship of Hoplias aff. malabaricus collected in the Chasqueiro Reservoir and Stream in southern Brazil. During the study, 112 specimens were collected with total lengths ranging from 124
Fabiano Corrêa, Edson Fontes De Oliveira, Juvêncio Pouey, Sérgio Piedras   +3 more
doaj   +1 more source

Primeiro registro de albinismo em traí­­ra Hoplias malabaricus no Brasil

Boletim do Instituto de Pesca, 2018
Este trabalho é o primeiro registro de ocorrência de uma fêmea adulta de traí­­ra, Hoplias malabaricus, capturada no estado de Pernambuco, que apresentou caracterí­­sticas de albinismo total.
Tatiene Rossana Móta SILVA, Thiago André Tavares de ARAÚJO, Álvaro José de Almeida BICUDO   +2 more
doaj  

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

The fish fauna in tropical rivers: The case of the Sorocaba river basin, SP, Brazil

Revista de Biología Tropical, 2003
A survey was carried out on the fish species in the Sorocaba River basin, the main tributary of the left margin of the Tietê River, located in the State of São Paulo, Brazil. The species were collected with gill nets.
Welber Senteio Smith, Miguel Petrere, Walter Barrella   +2 more
doaj  

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

Illuminating the Dark: Using eDNA Metabarcoding to Study the Unique Ichthyofauna of the Furnas Formation Sinkholes

Environmental DNA, Volume 7, Issue 4, July–August 2025.
Using eDNA metabarcoding, we assessed fish diversity in isolated sinkholes in southern Brazil, uncovering signs of local extinction and species persistence. This approach offers a non‐invasive tool for biodiversity assessment and informs conservation efforts in unique karst environments.
Luz E. De la Ossa‐Guerra, Daniel M. Limeira, Roger H. Dalcin, Heron O. Hilário, Daniel C. Carvalho, Roberto F. Artoni   +5 more
wiley   +1 more source

Infecção e susceptibilidade de três espécies de peixe do rio Paraná, Presidente Epitácio, Estado de São Paulo, Brasil, a larvas de Contracaecum sp. (Nematoda: Anisakidae) - DOI: 10.4025/actascianimsci.v25i1.2096

Acta Scientiarum: Animal Sciences, 2008
Estudou-se a infecção por Contracaecum sp. (Nematoda: Anisakidae) em tucunarés (Cichla ocellaris), corvinas (Plagioscion squamosissimus) e traíras (Hoplias malabaricus) provenientes do rio Paraná próximo à cidade de Presidente Epitácio, região ainda não ...
Maurício Laterça Martins, Rosimeire de Souza Santos, Haroldo Kazuyuki Takahashi, Nilton Garcia Marengoni, Rodrigo Yudi Fujimoto   +4 more
doaj   +1 more source

Distribution pattern of two fish species in a coastal stream in Southeast Brazil

Brazilian Journal of Biology
Longitudinal distribution of Mimagoniates microlepis and Hoplias malabaricus was analyzed in a coastal stream system in Southeast Brazil. Six sites were sampled by electrofishing in seven months, from July 94 to July 95. Densities of M. microlepis, and H.
R. MAZZONI, R. IGLESIAS-RIOS
doaj   +1 more source