Results 71 to 80 of about 1,941 (190)

Evaluation of indicators of exposure to contaminants in three species of Colombian catfishes (Pisces: Siluriformes)

open access: yesBiota Colombiana, 2014
Mature specimens of three catfishes: Capitán de la Sabana (Eremophilus mutisii), Bagre Rayado (Pseudoplatystoma orinocoense and P. metaense) and Capaz (Pimelodus grosskopfii) (n=9-27/species) were sampled in the areas of Bogotá River, Puerto López (Meta)
Jaime González M.   +5 more
doaj   +1 more source

Local Environmental Variables Predict Fish Species Richness and Composition in Sand Beaches of a Neotropical River

open access: yesRiver Research and Applications, Volume 41, Issue 9, Page 1949-1958, November 2025.
ABSTRACT Local and regional species diversity is influenced by historical factors, resource availability, biotic interactions, the presence of resources, and adequate environmental conditions. We evaluated the effects of local environmental variables and spatial structure on fish species richness and composition along sandy beaches of a Neotropical ...
Ronaldo Souza da Silva   +8 more
wiley   +1 more source

Infection of the heart of Pimelodus ornatus (Teleostei, Pimelodidae), by Myxobolus sp. (Myxozoa, Myxobolidae) [PDF]

open access: yesRevista Brasileira de Parasitologia Veterinária, 2014
The phylum Myxozoa Grassé, 1970, consists of a heterogenous group of around 50 genera that are worldwide disseminated in a wide variety of aquatic media. In the present study, 43 specimens of Pimelodus ornatus were collected from an adjacent area to the Cachoeira do Arari municipality on Marajó Island, in the Brazilian state of Pará, in 2013 ...
Matos, Edilson   +5 more
openaire   +6 more sources

Evolutionary history of Middle American Rhamdia (Siluriformes: Heptapteridae) inferred from comparative mitogenomic data: Insights on historical biogeography and cave colonization in the group

open access: yesJournal of Systematics and Evolution, Volume 63, Issue 6, Page 1501-1518, November 2025.
Investigating the systematics and biogeography of Neotropical catfishes of the genus Rhamdia refined phylogenetic hypotheses, including deep paraphyly of Rhamdia laticauda, supported northward dispersal catalyzed by emergence of the Panamanian Isthmus and imply that cave colonization is widespread, convergent, and recent, with established cave‐dwelling
Jairo Arroyave   +6 more
wiley   +1 more source

Evolutionary Relationships Among the Amazonian Catfish Genus Hypophthalmus Cuvier, 1829 (Siluriformes, Pimelodidae) Suggest Diversification During Plio‐Pleistocene

open access: yesZoologica Scripta, Volume 54, Issue 6, Page 840-850, November 2025.
ABSTRACT The present study evaluated the phylogenetic relationships among the six valid species of catfish of the genus Hypophthalmus, estimated the divergence times among the different taxa and assessed the processes that influenced the evolution of the group.
Bianca A. Vale   +4 more
wiley   +1 more source

Parasites Are Paramount: Vertical Trophic Positions of Parasitic Catfishes in a Tropical River Food Web

open access: yesEcology of Freshwater Fish, Volume 34, Issue 4, October 2025.
ABSTRACT The Neotropical catfish family Trichomycteridae contains parasitic fishes that include scale and mucus feeders (subfamily Stegophilinae) and blood feeders (i.e., ‘candirus’, subfamily Vandelliinae). The influence of parasitic catfishes on food web dynamics is unknown.
Carmen G. Montaña   +7 more
wiley   +1 more source

Clave artificial de las familias de peces del río Magdalena

open access: yesCaldasia, 1942
Patamotrygonidae / Ageneiosidae / Pimelodidae / Auchenipteridae / Bunocephalidae / Cetopsidae /  Pygidiidae / Astroblepidae / Doradidae / Loricariidae / Callichthyidae / Characidae / Erythrinidae / Cyprinodotitidae / Poeciliidae / Sciaenidae / Cichlidae /
Miles Cecil
doaj  

Influência de diferentes níveis de luminosidade sobre o desempenho de larvas de Jundiá (Rhamdia quelen) (Quoy e Gaimard, 1824) (Pisces: pimelodidae)

open access: yesActa Scientiarum: Biological Sciences, 2008
O presente trabalho foi realizado com o objetivo de verificar o efeito de 3 níveis de luminosidade (T1=1,2 lux; T2=17 lux e T3=20 lux) sobre o crescimento e a sobrevivência de larvas de jundiá (Rhamdia quelen), durante as 3 primeiras semanas de cultivo ...
Everton Rodolfo Behr   +3 more
doaj   +1 more source

Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Siluriformes) [PDF]

open access: yes, 2020
Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae.
Artoni   +7 more
core  

Estudio preliminar de ictioplancton de la Amazonia peruana con énfasis en la familia Pimelodidae

open access: yes, 2017
En el presente trabajo se informa y describen las larvas de peces presentes en la naciente del río Madre de Dios, con énfasis en la familia Pimelodidae.
Ortega, Hernán   +3 more
core  

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