Results 271 to 280 of about 18,024 (300)

Chromosome characterization in Acestrorhynchinae and Cynopotaminae (Pisces, Characidae)

Journal of Fish Biology, 1985
The karyotypes of six species of Acestrorhynchinae (Acestrorhynchus alus, A. lacustris, Oligosarcus hepsetus, O. jenynsii, O. macrolepis and O. pinloi) and of one species of Cynopotaminae (Galeocharax knerii) were studied. The six Acestrorhynchinae species have 2n= 50, while Galeocharax knerii has 2n= 52 chromosomes.
J. Neves Falcão, Luis Antônio Carlos Bertollo   +1 more
openaire   +2 more sources

Comparative mitochondrial genomics of tetras: insights into phylogenetic relationships in Characidae

Biologia, 2022
Wei Xu, Jiachen Wang, Runfeng Xu, Haoming Jiang, Jiayu Ding, Han Wu, Yongbo Wu, Hongyi Liu   +7 more
semanticscholar   +1 more source

Early development ofBrycon orthotaenia(Pisces: Characidae)

Zygote, 2011
SummaryBrycon orthotaeniais an important fish for commercial and sport fishing and may reach 7 kg in body weight; it is endangered in some regions of Brazil's São Francisco River Basin. Breeders were subjected to spawning induction to analyse the early development; oocytes and semen were obtained by manual extrusion and fertilization was carried out ...
Rafael Zeferino Gomes, Elizete Rizzo, Yoshimi Sato, Nilo Bazzoli   +3 more
openaire   +3 more sources

Is resource partitioning the key? The role of intra-interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers.

Journal of Fish Biology, 2018
This study focused on intra and interspecific variations in the diet of small species in the Pelotas River, upper Uruguay River ecoregion. We tested the hypothesis that five small characids coexist via resource partitioning.
M. P. Neves, J. C. da Silva, Dirceu Baumgartner, G. Baumgartner, R. L. Delariva   +4 more
semanticscholar   +1 more source

A phylogeny of Astyanax (Characiformes: Characidae) in Central and North America

Zootaxa, 2016
A phylogeny is presented for 34 species of Astyanax, 27 of them once included within A. aeneus or A. fasciatus in Central America and Mexico, based on 52 morphological characters (mostly osteological, but also pigmentation and meristics), with three outgroups. Monophyly is not supported for A. aeneus s. lat., as Brazilian species such as A. fasciatus s.
openaire   +2 more sources

Cold and warm waters: energy metabolism and antioxidant defenses of the freshwater fish Astyanax lacustris (Characiformes: Characidae) under thermal stress

Journal of Comparative Physiology □ B, 2021
I. C. Schleger, Diego Mauro Carneiro Pereira, Anna Carolina Resende, S. Romão, T. Herrerias, Ananda Karla Alves Neundorf, Alessandro Mateus Sloty, Ivan Moyses Guimarães, Maria Rosa Dmengeon Pedreiro de Souza, Guilherme Prosperi Carster, L. Donatti   +10 more
semanticscholar   +1 more source

Can the insecticide imidacloprid affect the health of the Neotropical freshwater fish Astyanax altiparanae (Teleostei: Characidae)?

Environmental Toxicology and Pharmacology, 2021
É. C. Almeida, L. S. Passos, C. Vieira, Raphael Danna Acayaba, C. Montagner, E. Pinto, C. Martinez, A. Fonseca   +7 more
semanticscholar   +1 more source

Hyphessobrycon rheophilus, a new species from rapids of the Amazon and Orinoco river basins (Characiformes: Characidae: Stethaprioninae).

Zootaxa, 2019
A new species from rapids of Rio Aripuanã, Rio Madeira basin, in Brazil, and from the same type of habitat in the upper Rio Negro and upper Rio Orinoco basins in Brazil, Colombia, and Venezuela is described and assigned to the genus Hyphessobrycon.
W. Ohara, T. F. Teixeira, J. G. Albornoz-Garzón, J. M. Mirande, F. Lima   +4 more
semanticscholar   +1 more source

Nonsteroidal anti-inflammatory drugs act as endocrine disruptors in Astyanax lacustris (Teleostei: Characidae) reproduction: An ex vivo approach.

Aquatic Toxicology, 2021
G. S. Branco, R. G. Moreira, M. I. Borella, M. P. Camargo, Marcela Muñoz-Peñuela, A. D. Gomes, C. E. Tolussi   +6 more
semanticscholar   +1 more source

Fine structure of the drum muscles of the piranha (serrasalminae, characidae) [PDF]

Cell and Tissue Research, 1977
The anterior and the posterior drum muscles of the piranha resemble each other in all essential fine structural aspects: myofibrils are slender; sarcomeres are short compared with those of other drum muscles; mitochondria, located in the periphery of the fibers, are numerous and show an irregular internal structure; and the sarcoplasmic reticulum is ...
openaire   +2 more sources