Results 21 to 30 of about 139 (103)

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

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

Length-weight relationship of Hoplias aff. malabaricus (Bloch, 1794) in a subtropical wetland [PDF]

Brazilian Journal of Biology, 2016
Hoplias aff. malabaricus (Bloch, 1794) is a predatory fish from the Erythrinidae family, widely distributed, occurring in river basins of South America (Oyakawa and Mattox, 2009). This species has a vital role in ecosystems as top predator besides having an important economic value for fisheries (Chaves et al., 2009).
F. Corrêa, S. Huckembeck, G. V. Canziani   +2 more
doaj   +3 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

Comparative histology in the liver and spleen of three species of freshwater teleost

Neotropical Ichthyology, 2017
We describe and compare the histology of liver and spleen ofGeophagus brasiliensis (Perciformes), Hypostomus francisci (Siluriformes) and Hoplias aff. malabaricus (Characiformes), tropical freshwater fishes. InG. brasiliensisandH. aff.
Camila F. Sales, Regianne F. Silva, Marília G. C. Amaral, Fabrício F. T. Domingos, Rosy I. M. A. Ribeiro, Ralph G. Thomé, Hélio B. Santos   +6 more
doaj   +1 more source

A new endemic pearl cichlid of the ‘Geophagus’ brasiliensis (Cichliformes: Cichlidae) species group from the Piranga River, upper Doce River basin, southeastern Brazil

Journal of Fish Biology, Volume 108, Issue 6, Page 1687-1700, June 2026.
Abstract A new species of pearl cichlid of the ‘Geophagus’ brasiliensis species group, endemic to the Piranga River, a major tributary of the upper Doce River basin in the state of Minas Gerais, southeastern Brazil, is herein described. The new species is delimited using an integrative approach, with molecular‐based species delimitation methods coupled
Cidimar E. de Assis, Jorge A. Dergam, Amanda F. Cunha, Valéria N. Machado, Tomas Hrbek, Natállia M. de F. Vicente, Victor de Queiroz, Elisabeth Henschel   +7 more
wiley   +1 more source

Aquatic and Terrestrial Invertebrates Support Fish Assemblages of Amazonian Streams

Freshwater Biology, Volume 71, Issue 5, May 2026.
ABSTRACT The Amazonian stream network is remarkable not only for its extent but also for its rich fish diversity. These streams are interconnected with the surrounding forests. However, key ecological aspects of Amazonian freshwater ecosystems, such as energy flows and carbon sources sustaining fish assemblages, remain poorly understood. In this study,
Pedro H. S. Basilio, Cecília G. Leal, Débora R. de Carvalho, Gabriel L. Brejão, Dennys H. C. Drager, Gilberto N. Salvador, Marcos A. Alves‐Filho, Vladimir E. Costa, Gabriel O. Ferraz, Gustavo S. Ferreira, Rafael P. Leitão, Luciano F. A. Montag, Jady V. A. S Santos, Everton C. Silva, Paulo S. Pompeu   +14 more
wiley   +1 more source

Effects of flooding regime on the feeding activity and body condition of piscivorous fish in the Upper Paraná River floodplain Efeitos do regime de cheias sobre a atividade alimentar e condição corporal de peixes piscívoros na planície de inundação do Alto Rio Paraná

Brazilian Journal of Biology, 2009
Flood pulses affect floodplain enrichment via the incorporation of nutrients and terrestrial biomass. As a result, they positively affect the body condition of aquatic organisms.
KDG. Luz-Agostinho, AA. Agostinho, LC. Gomes, HF. Júlio-Jr., R. Fugi   +4 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

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