Results 31 to 40 of about 172 (137)

Different feeding habits influence the activity of digestive enzymes in freshwater fish

Ciência Rural
: The aim of this study was to verify the activity of some digestive enzymes in four fish species with different feeding habits. Knowledge of these enzymatic activities can help us to understand the species' digestive processes.
Carolina Rosa Gioda, Alexandra Pretto, Carine de Souza Freitas, Jossiele Leitemperger, Vania Lucia Loro, Rafael Lazzari, Leandro Ademar Lissner, Bernardo Baldisserotto, Joseânia Salbego   +8 more
doaj   +1 more source

Variabilidade genética em uma população de Leporinus lacustris Campos, 1945 (Osteichthyes: Anostomidae) da Lagoa do Carão (planície de inundação do alto rio Paraná), Brasil - DOI: 10.4025/actascibiolsci.v27i1.1370

Acta Scientiarum: Biological Sciences, 2008
A variabilidade genética de Leporinus lacustris foi estimada a partir de uma população coletada na lagoa do Carão (22o44’S/53o17’W), na planície de inundação do alto rio Paraná.
Maria Dolores Peres, Erasmo Renesto
doaj   +1 more source

Spatial variations in fish assemblage structure in a southeastern Brazilian reservoir

Brazilian Journal of Biology
We assessed the fish assemblage structure and composition of Nova Ponte Reservoir (Araguari River, Upper Paraná Basin, Brazil). We observed significant differences in abundance (p = 0.0003), richness (p = 0.0005) and diversity (p = 0.02) between ...
B. O. Sanches, R. M. Hughes, D. R. Macedo, M. Callisto, G. B. Santos   +4 more
doaj   +1 more source

Cryptic diversity and recent diversification in the Pyrrhulina australis species complex (Characiformes, Lebiasinidae) revealed by mitochondrial DNA

Journal of Fish Biology, EarlyView.
Abstract Pyrrhulina australis Eigenmann & Kennedy, 1903, is widely distributed across the main hydrographic basins of South America. The taxonomic integrity of this species is nevertheless challenged by the lack of clear diagnostic characters, its marked geographic variation and the morphological overlap with its congeners. In this context, the present
Taina Barbosa De Souza, Daniela Cristina Ferreira, Hugmar Pains Da Silva, Carolina B. Machado, Claudio Oliveira, André L. Netto‐Ferreira, Paulo C. Venere   +6 more
wiley   +1 more source

Fish Assemblages in an Urbanized Neotropical Basin: Influence of Environmental Factors Across Dry and Rainy Periods

International Review of Hydrobiology, Volume 111, Issue 2, December 2026.
ABSTRACT This study investigated the effects of season and environmental disturbances on fish communities in neotropical rivers of the Sorocaba basin, a Sub‐Basin of the Paraná River in Southeast Brazil, based on sampling 1196 individuals from 49 species, including two non‐native and one threatened with extinction.
Natalia S. Alves, Daiane E. Cavallari, Welber S. Smith   +2 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

Length‒Weight and Length‒Length Relationships of Freshwater Fish Species Caught by Professional Fishermen in the Itaipu Reservoir, Brazil

Journal of Applied Ichthyology, Volume 2025, Issue 1, 2025.
Length‒weight relationships (LWRs) and length‒length relationships (LLRs) were estimated for 63 and 58 freshwater fish species, respectively, captured in the Itaipu Reservoir, Paraná River Basin, Paraná State, Brazil. Sampling was carried out from March 1987 to July 2024 at 63 professional fishing sites within the reservoir’s area of influence ...
Éder André Gubiani, Luiz Guilherme dos Santos Ribas, Anderson Luís Maciel, Geuza Cantanhêde, Laís Thayse Meier, Pitágoras Augusto Piana, Caroline Henn, Yintao Jia   +7 more
wiley   +1 more source

The 2,4-D herbicide effects on acetylcholinesterase activity and metabolic parameters of piava freshwater fish (Leporinus obtusidens)

Ecotoxicology and Environmental Safety, 2008
The effects of 2,4-D (1 or 10 mg/L) on acetylcholinesterase (AChE) and metabolic parameters were evaluated in piava (Leporinus obtusidens) after 96 h. AChE activity was significantly reduced in the brain at a concentration of 10 mg/L and in the muscle at both concentrations tested.
Milene Braga, da Fonseca, Lissandra, Glusczak, Bibiana Silveira, Moraes, Charlene Cavalheiro, de Menezes, Alexandra, Pretto, Miguel Angel, Tierno, Renato, Zanella, Fábio Ferreira, Gonçalves, Vânia Lúcia, Loro   +8 more
openaire   +2 more sources

Statistical distribution models for migratory fish in Jacuí basin, South Brazil

Neotropical Ichthyology
The aim of the present study was to identify the distribution patterns of migratory fishes in the Jacuí river basin (Rio Grande do Sul, South Brazil), proposing a statistical model of presumed distribution based on geomorphologic environmental data ...
Thaís P. Alves, Nelson F. Fontoura
doaj   +1 more source

The influence of dam construction on a population of Leporinus obtusidens (Valenciennes, 1847) (Pisces, Anostomidae) in the Yacyretá Reservoir (Argentina)

Fisheries Research, 2005
Abstract A field study of age, growth and mortality of the “boga”, Leporinus obtusidens (Valenciennes, 1847) was carried out in the Yacyreta Reservoir, High Parana River, Argentina. We compared age-structure, length–weight relationships and condition factor coefficients in phases previous (1990–1994) and subsequent (1995–1998) to the reservoir ...
Araya, Patricia R., Agostinho, Angelo A., Bechara, Jose Alfredo   +2 more
openaire   +2 more sources