Results 51 to 60 of about 1,671 (171)

Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non‐Native Fishes From the Lower Doce River Basin in Southeastern Brazil

Anatomia, Histologia, Embryologia, Volume 55, Issue 5, September 2026.
ABSTRACT The ichthyofauna of the lower Doce River basin has been exposed to multiple anthropogenic stressors. Among these, the collapse of the Fundão mining tailings dam in Mariana, Minas Gerais, Brazil, in 2015 resulted in massive fish mortality and widespread contamination of aquatic environments.
Lucas Marcon, Késsia Leite Souza, Natália Martins Travenzoli, Gustavo Ribeiro Rosa, Mara Luiza de Almeida Santos, Wander Ribeiro Ferreira, Paula Nunes Coelho, Jorge Abdala Dergam dos Santos, Elisabeth Henschel   +8 more
wiley   +1 more source

Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy

Neotropical Ichthyology
The family Characidae is the most diverse among Neotropical fishes. Systematics of this family are mainly based on pre-cladistic papers, and only recently a phylogenetic hypothesis for Characidae was proposed by the author.
Juan Marcos Mirande
doaj   +1 more source

B chromosomes in Astyanax scabripinnis (Pisces, Characidae) [PDF]

Heredity, 1992
A karyotypic analysis was carried out using conventional staining and C-banding in 32 specimens of Astyanax scabripinnis (Pisces, Characidae) from Campos do Jordao (Sao Paulo State, Brazil). Twenty-eight individuals (87.5 per cent of the sample studied) showed 1–2 extra B-chromosomes, similar in size and shape (metacentrics) to pair 1 of the karyotype,
Lara Bellintani Salvador, Orlando Moreira-Filho   +1 more
openaire   +1 more source

Physical mapping of the 18S and 5S ribosomal genes in nine Characidae species (Teleostei, Characiformes)

Genetics and Molecular Biology, 2008
Characidae is one of the largest fish families of the Neotropical region, and presenting a pronounced morphological variability, certainly does not constitute a monophyletic group.
Wellington Adriano Moreira Peres, Luiz Antonio Carlos Bertollo, Orlando Moreira Filho   +2 more
doaj   +1 more source

Assessment of Small‐Meshed Gillnets for Sustainable Fisheries in the Chobe River, Namibia

Aquaculture, Fish and Fisheries, Volume 6, Issue 4, August 2026.
ABSTRACT Small‐meshed gillnets are restricted by the regulatory framework of the Namibian Inland Fisheries Act of 2003. This is mainly because smaller meshed nets are presumably selective towards juveniles of the large‐growing cichlid species. Thus, the aim of this study was to assess the impacts of smaller meshed gillnets (<73 mm) on the fish stocks ...
Evans Kamwi Simasiku, Kudakwashe Hove, Michael Sinvula Lukubwe, Oscar Madzingira, Thethela Bokhutlo   +4 more
wiley   +1 more source

Caudal Spotting in the Beacon Fish (Hemigrammus ocellifer Characidae) [PDF]

Journal of Heredity, 2002
The beacon fish (Hemigrammus ocellifer) exhibits two phenotypes associated with spotting at the base of the caudal fin, with fish either possessing (H. o. ocellifer) or lacking (H. o. falsus) a prominent red spot in this region. Segregation patterns observed from the progenies of 15 different crosses support a hypothesis that caudal spotting in this ...
openaire   +2 more sources

Fauna parasitária de peixes oriundos de “pesque-pague” do município de Guariba, São Paulo, Brasil - DOI: 10.4025/actascibiolsci.v28i3.253

Acta Scientiarum: Biological Sciences, 2007
Este trabalho descreve a ocorrência e a sazonalidade de parasitos em peixes de “pesque-pague” do município de Guariba, Estado de São Paulo, Brasil (21º15`22``S, 48º18`58``W e 595 m de altitude), durante o período de agosto de 2001 a julho de 2002.
Sergio Henrique Canello Schalch, Julieta Rodini Engracia de Moraes, Flávio Ruas de Moraes   +2 more
doaj   +1 more source

Fossil freshwater fishes from the Pliocene of northern Colombia and the palaeogeography of northern South America

Papers in Palaeontology, Volume 12, Issue 4, July/August 2026.
Abstract Freshwater fishes from the northwestern Colombian Andes are reported from the Pliocene Sincelejo and Ware formations. A total of 10 taxa have been identified, involving two orders, five families and nine genera. Characters from dental morphology, fin spines and cranial bones are provided as taxonomic tools for the study of fossil fishes.
Gustavo A. Ballen, Camilo Montes, Jorge D. Carrillo‐Briceño, Sergio Bogan, Sandra Reinales, Mario C. C. de Pinna, Carlos Jaramillo   +6 more
wiley   +1 more source

Taxonomic revision of Galeocharax (Characiformes: Characidae: Characinae) [PDF]

Neotropical Ichthyology, 2017
ABSTRACT The taxonomy of Galeocharax, a genus of freshwater fishes distributed in most South American cis-Andean river systems, except the rio Negro, rio São Francisco and rio Xingu basins and the eastern drainages of Brazil, is herein revised. A total of 1229 specimens were examined from which 680 had meristic and morphometric data taken. Osteological
Giovannetti, Victor, Toledo-Piza, Mônica, Menezes, Naércio A.   +2 more
openaire   +5 more sources

Disentangling Environmental, Spatial and Niche Influences on Fish Beta Diversity Along the Sandy Beaches of an Amazonian River

Freshwater Biology, Volume 71, Issue 7, July 2026.
ABSTRACT Beta diversity is an important descriptor of community structuring and it plays a crucial role for understanding the patterns and processes shaping biodiversity at multiple spatial extents. We investigated the influence of local, spatial, landscape factors and niche characteristics on fish beta diversity along the Acre River in Acre, Brazil ...
Ronaldo S. Silva, Lucas P. Oliveira, Naraiana L. Benone, Jean C. G. Ortega, Antonio A. Jardim Jr, Lídia B. Seabra, Fabiano Corrêa, Lisandro J. S. Vieira, Robert M. Hughes, Luciano F. A. Montag   +9 more
wiley   +1 more source