Results 51 to 60 of about 942 (171)

Activity patterns of South American silver catfish (Rhamdia quelen) [PDF]

Brazilian Journal of Biology, 2006
The South American silver catfish (Rhamdia quelen) is a widely distributed species in Central and South America in areas east of the Andes between Venezuela and the northern parts of Argentina. The bottom dwelling species occurs in lakes and reservoirs as well as in rivers. Between June 2000 and December 2001, sixteen silver catfish were tracked during
Schulz, U. H., Leuchtenberger, C.
openaire   +5 more sources

Gross brain morphology of Rhamdia quelen (Quoy & Gaimard 1824) (Ostariophysi: Siluriformes: Heptapteridae)

Papéis Avulsos de Zoologia, 2018
The brain gross morphology of Rhamdia quelen is described and compared with seven species of six genera of Heptapteridae. Interspecific variation in shape, size, and position of brain subdivisions was observed in all examined species.
Vitor Pimenta Abrahão, Fábio Müller dos Reis de Salles Pupo, Oscar Akio Shibatta   +2 more
doaj   +1 more source

Paracapillaria rhamdiaesp. n. (Nematoda: Capillariidae) fromRhamdia guatemalensis(Pisces) in Yucatan, Mexico [PDF]

Parasite, 1995
Une nouvelle espece de nematode, Paracapillaria rhamdiae n. sp., est observee dans l'estomac d'un silure d'eau douce (poisson-chat), Rhamdia guatemalensis (Gunther) au Yucatan, Mexique. Elle est caracterisee par de tres faibles mensurations (longueurs corporelles respectives du mâle et de la femelle 1,0 et 1,1 a 1,7 mm), un spicule remarquablement ...
F. Moravec, D. González Solis, J. Vargas Vázquez   +2 more
openaire   +1 more source

Intestinal responses in pacu (Piaractus mesopotamicus) exposed to fasting and refeeding nutritional management

The Anatomical Record, Volume 309, Issue 3, Page 663-673, March 2026.
Abstract Fasting is a practice in the aquaculture industry that aims to reduce feed costs. This practice can affect the gastrointestinal system of fish. The intestine plays a pivotal role in the nutrition and overall health of fishes. The present study sought to evaluate the effects of fasting and refeeding on body weight, intestine somatic index (ISI),
Karine Nathiele Nogueira Farias, André Luiz do Nascimento Silva, Marco Shizuo Owatari, Sabrina Fuzer Gonçalves, Robson Andrade Rodrigues, Cristiane Meldau de Campos, Lilian Franco‐Belussi, Carlos Eurico Fernandes   +7 more
wiley   +1 more source

Occurrence of natural triploidy in Rhamdia quelen (Siluriformes, Heptapteridae)

Genetics and Molecular Research, 2010
Five specimens of Rhamdia quelen collected from the Lindóia Stream, PR, Brazil, were cytogenetically analyzed. The diploid chromosome number found was 58, including 30 metacentric, 16 submetacentric, 10 subtelocentric, and 2 acrocentric chromosomes. Supernumerary or B chromosomes, frequently observed in this fish group, were not detected.
J R, Tsuda, V P O, de Moraes, L, Giuliano-Caetano, A L, Dias   +3 more
openaire   +2 more sources

Genetic variability of captive populations of Rhamdia quelen (Teleostei: Pimelodidae) using microsatellite markers

Biotemas, 2017
The analysis of genetic variability in populations that are candidates for breeding programs is important for selecting a base population, which maximizes genetic divergence.
Marina Virmond, Danielle Conceição, Hilton Amaral Junior, Rodolfo Luis Petersen   +3 more
doaj   +1 more source

Unraveling Temporal Fish Diversity in a Neotropical Hydropower Reservoir: Comparing eDNA Metabarcoding to Traditional Fishing Methods

Environmental DNA, Volume 8, Issue 2, March/April 2026.
Comparing eDNA metabarcoding and gillnet surveys in a Neotropical reservoir, this study finds that eDNA detects greater species richness yet reveals distinct assemblage structures. The results underscore the value of integrating both methods to achieve comprehensive biodiversity monitoring in hydropower‐impacted ecosystems.
Izabela Santos Mendes, Naiara Guimarães Sales, Allan D. McDevitt, Paulo Santos Pompeu, Francisco de Andrade Neto, Heron Oliveira Hilário, Daniel Cardoso Carvalho   +6 more
wiley   +1 more source

Subchronic effects of dipyrone on the fish species Rhamdia quelen

Ecotoxicology and Environmental Safety, 2011
The use of the non-steroidal anti-inflammatory drugs such as dipyrone is so widespread that this drug and its metabolites have been detected in effluents and surface water. This study aimed to evaluate the potential toxic effects of dipyrone on the aquatic environment, using a native fish species, Rhamdia quelen.
J H, Pamplona, E T, Oba, T A, da Silva, L P, Ramos, W A, Ramsdorf, M M, Cestari, C A Oliveira, Ribeiro, A R, Zampronio, H C Silva, de Assis   +8 more
openaire   +2 more sources

Rhamdia quelen Quoy & Gaimard 1824

, 2019
Published as part of Sébastien Brosse, Fréderic Melki & Régis Vigouroux, 2019, Fishes of the Mitaraka Mountains (French Guiana), pp. 131-151 in Zoosystema 41 (8) on page 146, DOI: 10.5252/zoosystema2019v41a8, http://zenodo.org/record ...
Sébastien Brosse, Fréderic Melki, Régis Vigouroux   +2 more
openaire   +2 more sources

Temperatures for fertilization and hatching and their influence on determining the sex ratio of the silver catfish Rhamdia quelen =Temperatura de fertilização e incubação e sua influência na determinação da proporção sexual do jundiá, Rhamdia quelen

Acta Scientiarum: Biological Sciences, 2010
This study aimed to evaluate the effects of water temperature duringfertilization and egg incubation in the determination of the sex ratio of fingerlings of silver catfish Rhamdia quelen.
Ricardo da Silva Longo, Alex Pires de Oliveira Nuñer   +1 more
doaj